diff --git a/python/sglang/benchmark/one_batch.py b/python/sglang/benchmark/one_batch.py
index b305bbb30..a5753df6d 100644
--- a/python/sglang/benchmark/one_batch.py
+++ b/python/sglang/benchmark/one_batch.py
@@ -75,7 +75,6 @@ from sglang.srt.distributed.parallel_state import (
     destroy_distributed_environment,
     destroy_model_parallel,
 )
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.entrypoints.engine import _set_envs_and_config
 from sglang.srt.hardware_backend.mlx.runtime import use_mlx
 from sglang.srt.layers.dp_attention import compute_dp_attention_world_info
@@ -329,32 +328,10 @@ def load_model(server_args, port_args, gpu_id, tp_rank):
             cfg.attn_cp_size,
         )
     )
-    ps = ParallelState(
-        tp_rank=tp_rank,
-        tp_size=cfg.tp_size,
-        pp_rank=0,
-        pp_size=1,
-        dp_rank=None,
-        dp_size=cfg.dp_size,
-        attn_tp_rank=attn_tp_rank,
-        attn_tp_size=attn_tp_size,
-        attn_cp_rank=0,
-        attn_cp_size=cfg.attn_cp_size,
-        attn_dcp_rank=tp_rank % cfg.dcp_size,
-        attn_dcp_size=cfg.dcp_size,
-        attn_dp_rank=attn_dp_rank,
-        attn_dp_size=attn_dp_size,
-        moe_ep_rank=moe_ep_rank,
-        moe_ep_size=cfg.ep_size,
-        moe_dp_rank=None,
-        moe_dp_size=cfg.moe_dp_size,
-        gpu_id=gpu_id,
-    )
     runner_kwargs = dict(
         model_config=model_config,
         mem_fraction_static=cfg.mem_fraction_static,
         gpu_id=gpu_id,
-        ps=ps,
         nccl_port=port_args.nccl_port,
         server_args=server_args,
     )
@@ -571,7 +548,7 @@ def _maybe_prepare_mlp_sync_batch(batch: ScheduleBatch, model_runner):
             model_runner=model_runner,
             dp_size=get_parallel().dp_size,
             attn_tp_size=get_parallel().attn_tp_size,
-            attn_cp_size=model_runner.ps.attn_cp_size,
+            attn_cp_size=model_runner.attn_cp_size,
             tp_group=model_runner.tp_group,
             get_idle_batch=None,
             disable_cuda_graph=cuda_graph_fully_disabled(),
@@ -709,13 +686,12 @@ def correctness_test(
     gpu_id,
     tp_rank,
 ):
-    # With the placement this process was spawned with, so a rank read here
-    # does not need a process group -- the same bundle the runner is handed.
     publish(
         server_args,
         role="scheduler",
         ranks=SpawnRanks(
-            world_rank=spawn_world_rank(server_args, tp_rank=tp_rank, pp_rank=0)
+            world_rank=spawn_world_rank(server_args, tp_rank=tp_rank, pp_rank=0),
+            gpu_id=gpu_id,
         ),
     )
 
@@ -926,7 +902,8 @@ def latency_test(
         server_args,
         role="scheduler",
         ranks=SpawnRanks(
-            world_rank=spawn_world_rank(server_args, tp_rank=tp_rank, pp_rank=0)
+            world_rank=spawn_world_rank(server_args, tp_rank=tp_rank, pp_rank=0),
+            gpu_id=gpu_id,
         ),
     )
     initialize_moe_config()
diff --git a/python/sglang/srt/arg_groups/arg_utils.py b/python/sglang/srt/arg_groups/arg_utils.py
index 4e25707d6..168c5edad 100644
--- a/python/sglang/srt/arg_groups/arg_utils.py
+++ b/python/sglang/srt/arg_groups/arg_utils.py
@@ -92,6 +92,9 @@ class Arg(msgspec.Struct, frozen=True):
     fallback: Any = None
 
 
+_NO_DEFAULT = object()
+
+
 class Derived(msgspec.Struct, frozen=True):
     """Metadata for a field the configuration implies, not one anyone types.
 
@@ -122,6 +125,12 @@ class Derived(msgspec.Struct, frozen=True):
 
     doc: str = ""
     fn: str = ""
+    # For a declaration with no ``fn`` whose absence is itself an answer:
+    # ``gpu_id`` is ``None`` in a process that runs on no device, and a reader
+    # wants that rather than an error. A rank has no such value -- the wrong
+    # one is a hang in a collective -- so it carries no default and a read
+    # before the write says so.
+    default: Any = _NO_DEFAULT
 
 
 class NS(msgspec.Struct, frozen=True):
diff --git a/python/sglang/srt/arg_groups/fields/device.py b/python/sglang/srt/arg_groups/fields/device.py
index 8b329fd13..1463bf6cd 100644
--- a/python/sglang/srt/arg_groups/fields/device.py
+++ b/python/sglang/srt/arg_groups/fields/device.py
@@ -17,7 +17,7 @@ from typing import (
 
 import msgspec
 
-from sglang.srt.arg_groups.arg_utils import A
+from sglang.srt.arg_groups.arg_utils import A, Derived
 
 
 class Device(msgspec.Struct):
@@ -40,6 +40,17 @@ class Device(msgspec.Struct):
         int,
         "The delta between consecutive GPU IDs that are used. For example, setting it to 2 will use GPU 0,2,4,...",
     ] = 1
+    gpu_id = Derived(
+        doc=(
+            "Which device this process runs on. Nobody types it and nothing "
+            "computes it from the configuration: the parent decides -- "
+            "reindexing narrows the visible devices before the spawn, and Ray "
+            "allocates from its own pool -- so the entry states it in the "
+            "bundle it hands `publish`. `None` is an answer rather than an "
+            "absence: most roles run on no device at all."
+        ),
+        default=None,
+    )
     random_seed: A[Optional[int], "The random seed."] = None
     mlx_enable_sampling: A[
         bool,
diff --git a/python/sglang/srt/disaggregation/decode.py b/python/sglang/srt/disaggregation/decode.py
index e1f50d201..904fb1ee1 100644
--- a/python/sglang/srt/disaggregation/decode.py
+++ b/python/sglang/srt/disaggregation/decode.py
@@ -111,6 +111,7 @@ from sglang.srt.observability.scheduler_stage_metrics import (
     scheduler_stage_method,
 )
 from sglang.srt.runtime_context import (
+    get_device,
     get_disagg,
     get_memory,
     get_parallel,
@@ -439,7 +440,7 @@ class DecodePreallocQueue(DecodeHiCachePreallocMixin):
         if get_disagg().disaggregation_enable_kv_checksum:
             kv_args = self.kv_manager.kv_args
             self.scheduler.kv_checksum_computer = KvChecksumComputer(
-                device=torch.device(f"cuda:{self.scheduler.ps.gpu_id}"),
+                device=torch.device(f"cuda:{get_device().gpu_id}"),
                 kv_data_ptrs=kv_args.kv_data_ptrs,
                 kv_item_lens=kv_args.kv_item_lens,
                 state_data_ptrs=kv_args.state_data_ptrs,
@@ -565,7 +566,7 @@ class DecodePreallocQueue(DecodeHiCachePreallocMixin):
         kv_args.engine_rank = self.tp_rank % (attn_tp_size)
 
         kv_args.pp_rank = self.pp_rank
-        kv_args.system_dp_rank = self.scheduler.ps.dp_rank
+        kv_args.system_dp_rank = get_parallel().dp_rank
         kv_args.kv_cache_dtype_str = (
             self.scheduler.tp_worker.model_runner.kv_cache_dtype_str
         )
@@ -633,7 +634,7 @@ class DecodePreallocQueue(DecodeHiCachePreallocMixin):
         )
 
         kv_args.ib_device = get_disagg().disaggregation_ib_device
-        kv_args.gpu_id = self.scheduler.ps.gpu_id
+        kv_args.gpu_id = get_device().gpu_id
         kv_manager_class = get_kv_class(self.transfer_backend, KVClassType.MANAGER)
         kv_manager = kv_manager_class(
             kv_args,
diff --git a/python/sglang/srt/disaggregation/encoder/receiver.py b/python/sglang/srt/disaggregation/encoder/receiver.py
index 7404c6114..7c1cb6258 100644
--- a/python/sglang/srt/disaggregation/encoder/receiver.py
+++ b/python/sglang/srt/disaggregation/encoder/receiver.py
@@ -40,6 +40,7 @@ from sglang.srt.managers.schedule_batch import Modality, Req
 from sglang.srt.multimodal.cache import media_preprocess_kwargs
 from sglang.srt.multimodal.transport import determine_tensor_transport_mode
 from sglang.srt.runtime_context import (
+    get_device,
     get_disagg,
     get_exec,
     get_mm,
@@ -1921,7 +1922,7 @@ class MMReceiverBase(ABC):
                 self.scheduler_embedding_port,
             )
         self.scheduler = scheduler
-        self.gpu_id = scheduler.ps.gpu_id if scheduler is not None else 0
+        self.gpu_id = get_device().gpu_id if scheduler is not None else 0
         self.wait_timeout = envs.SGLANG_ENCODER_RECV_TIMEOUT.get()
         self.embedding_pool = None
 
diff --git a/python/sglang/srt/disaggregation/prefill.py b/python/sglang/srt/disaggregation/prefill.py
index f46db8422..7a405849d 100644
--- a/python/sglang/srt/disaggregation/prefill.py
+++ b/python/sglang/srt/disaggregation/prefill.py
@@ -87,6 +87,7 @@ from sglang.srt.observability.scheduler_stage_metrics import (
     scheduler_stage_method,
 )
 from sglang.srt.runtime_context import (
+    get_device,
     get_disagg,
     get_parallel,
     get_schedule,
@@ -212,7 +213,7 @@ class PrefillBootstrapQueue:
         if get_disagg().disaggregation_enable_kv_checksum:
             kv_args = self.kv_manager.kv_args
             self.scheduler.kv_checksum_computer = KvChecksumComputer(
-                device=torch.device(f"cuda:{self.scheduler.ps.gpu_id}"),
+                device=torch.device(f"cuda:{get_device().gpu_id}"),
                 kv_data_ptrs=kv_args.kv_data_ptrs,
                 kv_item_lens=kv_args.kv_item_lens,
                 state_data_ptrs=kv_args.state_data_ptrs,
@@ -226,7 +227,7 @@ class PrefillBootstrapQueue:
         kv_args = kv_args_class()
         kv_args.engine_rank = self.tp_rank
         kv_args.pp_rank = self.pp_rank
-        kv_args.system_dp_rank = self.scheduler.ps.dp_rank
+        kv_args.system_dp_rank = get_parallel().dp_rank
         kv_args.rust_http_port = (
             self.scheduler.rust_server.http_port
             if self.scheduler.rust_server is not None
@@ -303,7 +304,7 @@ class PrefillBootstrapQueue:
             self.metadata_buffers.get_buf_infos()
         )
         kv_args.ib_device = get_disagg().disaggregation_ib_device
-        kv_args.gpu_id = self.scheduler.ps.gpu_id
+        kv_args.gpu_id = get_device().gpu_id
 
         req_to_token_pool = getattr(self.scheduler, "req_to_token_pool", None)
         setup_state_kv_args(
diff --git a/python/sglang/srt/disaggregation/role_switch.py b/python/sglang/srt/disaggregation/role_switch.py
index f0b580584..8bf90e20a 100644
--- a/python/sglang/srt/disaggregation/role_switch.py
+++ b/python/sglang/srt/disaggregation/role_switch.py
@@ -13,7 +13,7 @@ from typing import TYPE_CHECKING, Callable, Optional, Tuple
 from sglang.srt.disaggregation.common.conn import CommonKVReceiver
 from sglang.srt.disaggregation.utils import DisaggregationMode
 from sglang.srt.managers.io_struct import PdRoleSwitchReqInput, PdRoleSwitchReqOutput
-from sglang.srt.runtime_context import get_context, get_disagg
+from sglang.srt.runtime_context import get_context, get_device, get_disagg
 from sglang.srt.utils import get_available_gpu_memory
 
 if TYPE_CHECKING:
@@ -95,7 +95,7 @@ def handle_pd_role_switch(
             )
         try:
             available_graph_gb = get_available_gpu_memory(
-                scheduler.device, scheduler.ps.gpu_id
+                scheduler.device, get_device().gpu_id
             )
         except Exception as e:
             return _fail(
diff --git a/python/sglang/srt/distributed/bootstrap.py b/python/sglang/srt/distributed/bootstrap.py
index f6efb4e5a..9f113c3a7 100644
--- a/python/sglang/srt/distributed/bootstrap.py
+++ b/python/sglang/srt/distributed/bootstrap.py
@@ -22,12 +22,12 @@ from sglang.srt.distributed.gated_launch import maybe_wait_for_gated_launch
 from sglang.srt.distributed.parallel_state import (
     _tag_groups_for_flashinfer_allreduce_only,
 )
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.environ import envs
 from sglang.srt.layers.dp_attention import initialize_dp_attention
 from sglang.srt.layers.layernorm_sp import initialize_layernorm_sp
 from sglang.srt.platforms import current_platform
 from sglang.srt.runtime_context import (
+    get_device,
     get_disagg,
     get_exec,
     get_parallel,
@@ -63,17 +63,17 @@ def init_torch_distributed(
     server_args: ServerArgs,
     model_config: ModelConfig,
     device: str,
-    ps: ParallelState,
     dist_port: int,
     is_draft_worker: bool,
     local_omp_cpuid: Optional[List[int]],
 ):
     tic = time.perf_counter()
     logger.info("Init torch distributed begin.")
+    parallel = get_parallel()
 
     backend = _resolve_backend(device=device)
 
-    before_avail_memory = get_available_gpu_memory(device, ps.gpu_id)
+    before_avail_memory = get_available_gpu_memory(device, get_device().gpu_id)
     if not get_parallel().enable_p2p_check:
         monkey_patch_p2p_access_check()
 
@@ -83,8 +83,8 @@ def init_torch_distributed(
     if not is_draft_worker:
         if device == "cpu":
             _init_cpu_threads_env(
-                tp_size=ps.tp_size,
-                tp_rank=ps.tp_rank,
+                tp_size=parallel.tp_size,
+                tp_rank=parallel.tp_rank,
                 local_omp_cpuid=local_omp_cpuid,
                 dist_init_method=dist_init_method,
             )
@@ -96,16 +96,18 @@ def init_torch_distributed(
             dist_init_method=dist_init_method,
             server_args=server_args,
             model_config=model_config,
-            gpu_id=ps.gpu_id,
+            gpu_id=get_device().gpu_id,
         )
 
         # Pre-warm NCCL/RCCL/HCCL to eliminate cold-start latency in first request
         # Controlled by --pre-warm-nccl flag (default: enabled on AMD GPUs)
         if get_exec().comm.pre_warm_nccl and (
-            ps.tp_size > 1 or ps.pp_size > 1 or ps.moe_ep_size > 1
+            parallel.tp_size > 1 or parallel.pp_size > 1 or parallel.moe_ep_size > 1
         ):
             _prewarm_nccl(
-                tp_size=ps.tp_size, pp_size=ps.pp_size, moe_ep_size=ps.moe_ep_size
+                tp_size=parallel.tp_size,
+                pp_size=parallel.pp_size,
+                moe_ep_size=parallel.moe_ep_size,
             )
 
         # CUDA graph capture enables the PyNCCL communicator for TP LM-head
@@ -115,7 +117,7 @@ def init_torch_distributed(
         if (
             device == "cuda"
             and get_parallel().enable_tp_lm_head_all_to_all
-            and ps.tp_size > 1
+            and parallel.tp_size > 1
         ):
             _prewarm_tp_lm_head_all_to_all()
 
@@ -127,13 +129,13 @@ def init_torch_distributed(
     # including them in this WORLD reduction would deadlock on absent peers.
     pre_model_load_memory = get_available_gpu_memory(
         device,
-        ps.gpu_id,
+        get_device().gpu_id,
         distributed=get_world_group().world_size > 1 and not is_draft_worker,
         cpu_group=get_world_group().cpu_group,
     )
     # Check memory for tensor parallelism
-    local_gpu_memory = get_available_gpu_memory(device, ps.gpu_id)
-    if ps.tp_size > 1 and not is_draft_worker:
+    local_gpu_memory = get_available_gpu_memory(device, get_device().gpu_id)
+    if parallel.tp_size > 1 and not is_draft_worker:
         _check_tp_memory_balance(
             pre_model_load_memory=pre_model_load_memory,
             local_gpu_memory=local_gpu_memory,
diff --git a/python/sglang/srt/distributed/parallel_state_wrapper.py b/python/sglang/srt/distributed/parallel_state_wrapper.py
deleted file mode 100644
index 82a7ece32..000000000
--- a/python/sglang/srt/distributed/parallel_state_wrapper.py
+++ /dev/null
@@ -1,51 +0,0 @@
-from dataclasses import dataclass
-from typing import Optional
-
-
-@dataclass(frozen=True, slots=True, kw_only=True)
-class ParallelState:
-    tp_rank: int
-    tp_size: int
-    pp_rank: int
-    pp_size: int
-    dp_rank: Optional[int]
-    dp_size: int
-    attn_tp_rank: int
-    attn_tp_size: int
-    attn_cp_rank: int
-    attn_cp_size: int
-    attn_dcp_rank: int
-    attn_dcp_size: int
-    attn_dp_rank: int
-    attn_dp_size: int
-    moe_ep_rank: int
-    moe_ep_size: int
-    moe_dp_rank: Optional[int]
-    moe_dp_size: int
-    gpu_id: int
-
-    @staticmethod
-    def trivial(**overrides: Optional[int]) -> "ParallelState":
-        kwargs: dict[str, Optional[int]] = dict(
-            tp_rank=0,
-            tp_size=1,
-            pp_rank=0,
-            pp_size=1,
-            dp_rank=0,
-            dp_size=1,
-            attn_tp_rank=0,
-            attn_tp_size=1,
-            attn_cp_rank=0,
-            attn_cp_size=1,
-            attn_dcp_rank=0,
-            attn_dcp_size=1,
-            attn_dp_rank=0,
-            attn_dp_size=1,
-            moe_ep_rank=0,
-            moe_ep_size=1,
-            moe_dp_rank=0,
-            moe_dp_size=1,
-            gpu_id=0,
-        )
-        kwargs.update(overrides)
-        return ParallelState(**kwargs)
diff --git a/python/sglang/srt/eplb/eplb_manager.py b/python/sglang/srt/eplb/eplb_manager.py
index e1e6fbd2b..6f59f3e40 100644
--- a/python/sglang/srt/eplb/eplb_manager.py
+++ b/python/sglang/srt/eplb/eplb_manager.py
@@ -31,7 +31,6 @@ class EPLBManager:
         self,
         *,
         model_config: ModelConfig,
-        ps: Any,
         get_model: Callable[[], nn.Module],
         get_expert_location_updater: Callable[[], ExpertLocationUpdater],
         get_expert_backup_client: Callable[[], Any],
@@ -42,7 +41,6 @@ class EPLBManager:
         # constructed (model load, expert_backup_client, weight_updater), so
         # they are read through getters at rebalance time, not captured here.
         self._model_config = model_config
-        self._ps = ps
         self._get_model = get_model
         self._get_expert_location_updater = get_expert_location_updater
         self._get_expert_backup_client = get_expert_backup_client
@@ -163,7 +161,7 @@ class EPLBManager:
                 tp_rank=(
                     self._elastic_global_rank()
                     if is_post_scale_rebalance
-                    else self._ps.tp_rank
+                    else get_parallel().tp_rank
                 ),
                 use_flat_topology=is_post_scale_rebalance,
                 expert_backup_client=self._get_expert_backup_client(),
@@ -223,7 +221,7 @@ class EPLBManager:
         )
 
     def _elastic_global_rank(self) -> int:
-        return self._ps.tp_rank + get_parallel().ep_join_rank_offset
+        return get_parallel().tp_rank + get_parallel().ep_join_rank_offset
 
     def _check_rebalance_needed(self, average_utilization_rate_over_window):
         if average_utilization_rate_over_window is None:
@@ -248,7 +246,10 @@ class EPLBManager:
         return list(_chunk_list(all_layer_ids, chunk_size=chunk_size))
 
     def _should_log_expert_location_metadata(self) -> bool:
-        return self._ps.tp_rank == 0 and envs.SGLANG_LOG_EXPERT_LOCATION_METADATA.get()
+        return (
+            get_parallel().tp_rank == 0
+            and envs.SGLANG_LOG_EXPERT_LOCATION_METADATA.get()
+        )
 
     def _log_rebalance_layout_before_update(
         self,
diff --git a/python/sglang/srt/hardware_backend/mlx/model_runner_stub.py b/python/sglang/srt/hardware_backend/mlx/model_runner_stub.py
index d69e0511b..7a47ebf8f 100644
--- a/python/sglang/srt/hardware_backend/mlx/model_runner_stub.py
+++ b/python/sglang/srt/hardware_backend/mlx/model_runner_stub.py
@@ -172,7 +172,7 @@ class MlxModelRunnerStub(ModelRunner):
         aux_state_size = get_schedule().max_mamba_cache_size
         if aux_state_size is None:
             return None
-        return aux_state_size // self.ps.attn_dp_size
+        return aux_state_size // self.attn_dp_size
 
     def _resolve_max_running_requests(self) -> int:
         """Concurrency cap handed to the scheduler.
@@ -197,7 +197,7 @@ class MlxModelRunnerStub(ModelRunner):
             requested_per_worker = None
             resolved = min(capacity_cap, 4096)
         else:
-            requested_per_worker = requested // self.ps.attn_dp_size
+            requested_per_worker = requested // self.attn_dp_size
             resolved = min(requested_per_worker, capacity_cap)
 
         aux_state_size = self._explicit_aux_state_size_per_worker()
@@ -209,7 +209,7 @@ class MlxModelRunnerStub(ModelRunner):
             resolved = min(resolved, aux_state_size // ratio)
             if resolved <= 0:
                 global_aux_state_size = get_schedule().max_mamba_cache_size
-                min_global_aux_state_size = ratio * self.ps.attn_dp_size
+                min_global_aux_state_size = ratio * self.attn_dp_size
                 raise RuntimeError(
                     f"MLX auxiliary-state cache is too small to serve any "
                     f"requests: max_mamba_cache_size={global_aux_state_size} "
diff --git a/python/sglang/srt/hardware_backend/mlx/tp_worker.py b/python/sglang/srt/hardware_backend/mlx/tp_worker.py
index 6d2e6803f..dd16541d2 100644
--- a/python/sglang/srt/hardware_backend/mlx/tp_worker.py
+++ b/python/sglang/srt/hardware_backend/mlx/tp_worker.py
@@ -108,7 +108,6 @@ class MlxTpModelWorker(TpModelWorker):
             model_config=self.model_config,
             mem_fraction_static=get_schedule().mem_fraction_static,
             gpu_id=self.gpu_id,
-            ps=self.ps,
             nccl_port=self.nccl_port,
             server_args=self.server_args,
             is_draft_worker=self.is_draft_worker,
diff --git a/python/sglang/srt/hardware_backend/npu/attention/ascend_backend.py b/python/sglang/srt/hardware_backend/npu/attention/ascend_backend.py
index 41c0e92cc..e0b8d14a2 100644
--- a/python/sglang/srt/hardware_backend/npu/attention/ascend_backend.py
+++ b/python/sglang/srt/hardware_backend/npu/attention/ascend_backend.py
@@ -428,7 +428,7 @@ class AscendAttnBackend(AttentionBackend):
             self.is_dllm_model = True
             self.dllm_block_size = self.dllm_config.block_size
 
-        self.attn_cp_size = model_runner.ps.attn_cp_size
+        self.attn_cp_size = model_runner.attn_cp_size
 
     def _is_swa_layer(self, layer: RadixAttention) -> bool:
         return (
diff --git a/python/sglang/srt/layers/attention/flashattention_backend.py b/python/sglang/srt/layers/attention/flashattention_backend.py
index eb4204e38..ee187bade 100644
--- a/python/sglang/srt/layers/attention/flashattention_backend.py
+++ b/python/sglang/srt/layers/attention/flashattention_backend.py
@@ -203,7 +203,7 @@ class FlashAttentionBackend(AttentionBackend):
         self.use_mla = model_runner.model_config.attention_arch == AttentionArch.MLA
         self.kv_index_translator = model_runner.kv_index_translator
         self.skip_prefill = skip_prefill
-        self.attn_cp_size = model_runner.ps.attn_cp_size
+        self.attn_cp_size = model_runner.attn_cp_size
         self._verify_mask = None
         # The worker fetches the tree-mask scratch from the target backend
         # only; draft-side instances must not allocate it.
@@ -333,10 +333,10 @@ class FlashAttentionBackend(AttentionBackend):
         self.head_dim = model_runner.model_config.head_dim
         self.num_attention_heads = (
             model_runner.model_config.hf_text_config.num_attention_heads
-            // model_runner.ps.tp_size
+            // model_runner.tp_size
         )
         self.num_kv_heads = model_runner.model_config.get_num_kv_heads(
-            model_runner.ps.tp_size
+            model_runner.tp_size
         )
         _softcapping = getattr(
             model_runner.model_config.hf_text_config, "attn_logit_softcapping", None
diff --git a/python/sglang/srt/layers/attention/hpc_ops_backend.py b/python/sglang/srt/layers/attention/hpc_ops_backend.py
index f5fb08c09..22f40a807 100644
--- a/python/sglang/srt/layers/attention/hpc_ops_backend.py
+++ b/python/sglang/srt/layers/attention/hpc_ops_backend.py
@@ -162,9 +162,8 @@ class HPCOpsAttnBackend(AttentionBackend):
         self.use_fp8 = model_runner.kv_cache_dtype == torch.float8_e4m3fn
         if self.use_fp8:
             heads = (
-                model_runner.model_config.num_attention_heads
-                // model_runner.ps.tp_size,
-                model_runner.model_config.get_num_kv_heads(model_runner.ps.tp_size),
+                model_runner.model_config.num_attention_heads // model_runner.tp_size,
+                model_runner.model_config.get_num_kv_heads(model_runner.tp_size),
             )
             if heads not in FP8_ROPE_SUPPORTED_HEAD_CONFIGS:
                 raise ValueError(
@@ -177,8 +176,8 @@ class HPCOpsAttnBackend(AttentionBackend):
 
         config = model_runner.model_config
         head_dim = config.head_dim
-        num_q_heads = config.num_attention_heads // model_runner.ps.tp_size
-        num_kv_heads = config.get_num_kv_heads(model_runner.ps.tp_size)
+        num_q_heads = config.num_attention_heads // model_runner.tp_size
+        num_kv_heads = config.get_num_kv_heads(model_runner.tp_size)
         gqa_group_size = num_q_heads // num_kv_heads
         if head_dim != _SUPPORTED_HEAD_DIM or gqa_group_size not in (
             _SUPPORTED_GQA_GROUP_SIZES
diff --git a/python/sglang/srt/layers/attention/wave_backend.py b/python/sglang/srt/layers/attention/wave_backend.py
index 91c742f4e..03ac9a4d3 100644
--- a/python/sglang/srt/layers/attention/wave_backend.py
+++ b/python/sglang/srt/layers/attention/wave_backend.py
@@ -66,7 +66,7 @@ class WaveAttnBackend(AttentionBackend):
         import wave_lang.kernel.wave.cache as cache
 
         base_cache_dir = cache.CACHE_BASE_DIR
-        new_dir = base_cache_dir / f"worker_{model_runner.ps.tp_rank}"
+        new_dir = base_cache_dir / f"worker_{model_runner.tp_rank}"
         logger.info(f"Setting Wave cache dir: {new_dir}")
         cache.CACHE_BASE_DIR = new_dir
 
diff --git a/python/sglang/srt/layers/attention/xpu_backend.py b/python/sglang/srt/layers/attention/xpu_backend.py
index 464fc9025..2fdcb73d2 100644
--- a/python/sglang/srt/layers/attention/xpu_backend.py
+++ b/python/sglang/srt/layers/attention/xpu_backend.py
@@ -67,7 +67,7 @@ class XPUAttentionBackend(AttentionBackend):
         self.num_attention_heads = (
             model_runner.model_config.hf_text_config.num_attention_heads
         )
-        self.tp_size = model_runner.ps.tp_size
+        self.tp_size = model_runner.tp_size
         assert self.num_attention_heads % self.tp_size == 0
         self.num_local_heads = self.num_attention_heads // self.tp_size
         self.device = model_runner.device
diff --git a/python/sglang/srt/layers/deep_gemm_wrapper/compile_utils.py b/python/sglang/srt/layers/deep_gemm_wrapper/compile_utils.py
index 4db8a4a92..b1f282d90 100644
--- a/python/sglang/srt/layers/deep_gemm_wrapper/compile_utils.py
+++ b/python/sglang/srt/layers/deep_gemm_wrapper/compile_utils.py
@@ -510,7 +510,7 @@ def pp_parallel_deep_gemm_warmup(runner) -> None:
         "PP-parallel DeepGEMM warmup start "
         "(pp_rank=%d, tp_rank=%d, batch_sizes=%s, disagg=%s).",
         get_parallel().pp_rank,
-        model_runner.ps.tp_rank,
+        model_runner.tp_rank,
         batch_sizes,
         disagg_mode,
     )
diff --git a/python/sglang/srt/layers/dp_attention.py b/python/sglang/srt/layers/dp_attention.py
index c77d916bb..ce6666375 100644
--- a/python/sglang/srt/layers/dp_attention.py
+++ b/python/sglang/srt/layers/dp_attention.py
@@ -47,6 +47,24 @@ if TYPE_CHECKING:
     from sglang.srt.model_executor.forward_batch_info import ForwardBatch
 
 
+def deployment_attn_dp_size() -> int:
+    """Attention-DP replicas in the deployment, which no draft scope narrows.
+
+    A draft runs on one attention-DP replica and its scope says so, but the
+    metadata a draft gathers is shaped by the replicas it gathers *with* --
+    the target's. Those come from the configuration, which the scope leaves
+    alone, so this answers the same number inside the scope and outside it.
+    """
+    parallel = get_parallel()
+    attn_dp_size, _ = derive_attention_widths(
+        tp_size=parallel.tp_size,
+        attn_cp_size=parallel.attn_cp_size,
+        dp_size=parallel.dp_size,
+        enable_dp_attention=parallel.enable_dp_attention,
+    )
+    return attn_dp_size
+
+
 def dp_gather_width() -> int:
     """How many replicas the DP sync gathers over.
 
diff --git a/python/sglang/srt/managers/scheduler.py b/python/sglang/srt/managers/scheduler.py
index b0130f353..f92b88835 100644
--- a/python/sglang/srt/managers/scheduler.py
+++ b/python/sglang/srt/managers/scheduler.py
@@ -104,12 +104,10 @@ from sglang.srt.disaggregation.utils import (
 from sglang.srt.distributed.parallel_state import (
     abort_distributed_environment,
 )
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.dllm.mixin.scheduler import SchedulerDllmMixin
 from sglang.srt.environ import envs, exportable_env_vars
 from sglang.srt.eplb.expert_distribution import get_global_expert_distribution_recorder
 from sglang.srt.hardware_backend.mlx.runtime import use_mlx
-from sglang.srt.layers.dp_attention import compute_dp_attention_world_info
 from sglang.srt.layers.moe import initialize_moe_config
 from sglang.srt.layers.quantization.fp4_utils import initialize_fp4_gemm_config
 from sglang.srt.layers.quantization.fp8_utils import initialize_fp8_gemm_config
@@ -449,12 +447,8 @@ class Scheduler(
         self,
         server_args: ServerArgs,
         port_args: PortArgs,
-        gpu_id: int,
         tp_rank: int,
-        moe_ep_rank: int,
         pp_rank: int,
-        attn_cp_rank: int,
-        moe_dp_rank: int,
         dp_rank: Optional[int],
     ):
         # NOTE: KEEP THE FOLLOWING CODE STYLE for this function:
@@ -516,38 +510,6 @@ class Scheduler(
         self.enable_dp_attention = get_parallel().enable_dp_attention
         self.enable_unified_memory = get_memory().enable_unified_memory
 
-        # Distributed rank info
-        attn_tp_rank, attn_tp_size, attn_dp_rank, attn_dp_size = (
-            compute_dp_attention_world_info(
-                get_parallel().enable_dp_attention,
-                tp_rank,
-                get_parallel().tp_size,
-                get_parallel().dp_size,
-                get_parallel().attn_cp_size,
-            )
-        )
-        self.ps = ParallelState(
-            tp_rank=tp_rank,
-            tp_size=get_parallel().tp_size,
-            pp_rank=pp_rank,
-            pp_size=get_parallel().pp_size,
-            dp_rank=dp_rank,
-            dp_size=get_parallel().dp_size,
-            attn_tp_rank=attn_tp_rank,
-            attn_tp_size=attn_tp_size,
-            attn_cp_rank=attn_cp_rank,
-            attn_cp_size=get_parallel().attn_cp_size,
-            attn_dcp_rank=tp_rank % get_parallel().dcp_size,
-            attn_dcp_size=get_parallel().dcp_size,
-            attn_dp_rank=attn_dp_rank,
-            attn_dp_size=attn_dp_size,
-            moe_ep_rank=moe_ep_rank,
-            moe_ep_size=get_parallel().ep_size,
-            moe_dp_rank=moe_dp_rank,
-            moe_dp_size=get_parallel().moe_dp_size,
-            gpu_id=gpu_id,
-        )
-
         # Init model configs
         self.init_model_config()
 
@@ -779,7 +741,7 @@ class Scheduler(
             if get_parallel().pp_size > 1:
                 logger.error("only zbal mix mode support pp_size > 1!")
             init_zbal(
-                get_parallel().tp_size, self.ps.gpu_id, get_parallel().tp_rank
+                get_parallel().tp_size, get_device().gpu_id, get_parallel().tp_rank
             )  # only switch allocator if is mix mode
 
     def init_model_config(self):
@@ -1009,8 +971,7 @@ class Scheduler(
     def init_tp_model_worker(self):
         worker_kwargs = dict(
             server_args=self.server_args,
-            gpu_id=self.ps.gpu_id,
-            ps=self.ps,
+            gpu_id=get_device().gpu_id,
             nccl_port=self.nccl_port,
         )
 
@@ -1047,8 +1008,7 @@ class Scheduler(
         # — is resolved per runner, not on a config copy.
         draft_worker_kwargs = dict(
             server_args=self.server_args,
-            gpu_id=self.ps.gpu_id,
-            ps=self.ps,
+            gpu_id=get_device().gpu_id,
             nccl_port=self.nccl_port,
             target_worker=self.tp_worker,
         )
@@ -1246,7 +1206,7 @@ class Scheduler(
 
         # Print debug info
         self.startup_available_gpu_memory_gb = get_available_gpu_memory(
-            self.device, self.ps.gpu_id, empty_cache=False
+            self.device, get_device().gpu_id, empty_cache=False
         )
         if get_parallel().tp_rank == 0:
             logger.info(
@@ -1582,7 +1542,7 @@ class Scheduler(
                 tp_rank=get_parallel().tp_rank,
                 tp_size=get_parallel().tp_size,
                 dp_size=get_parallel().dp_size,
-                gpu_id=self.ps.gpu_id,
+                gpu_id=get_device().gpu_id,
                 bootstrap_port=get_disagg().disaggregation_bootstrap_port,
                 max_total_num_tokens=self.max_total_num_tokens,
                 pp_rank=get_parallel().pp_rank,
@@ -1613,7 +1573,7 @@ class Scheduler(
                 metadata_buffers=self.disagg_metadata_buffers,
                 tp_rank=get_parallel().tp_rank,
                 tp_size=get_parallel().tp_size,
-                gpu_id=self.ps.gpu_id,
+                gpu_id=get_device().gpu_id,
                 bootstrap_port=get_disagg().disaggregation_bootstrap_port,
                 gloo_group=self.attn_tp_cpu_group,
                 max_total_num_tokens=self.max_total_num_tokens,
@@ -2248,7 +2208,6 @@ class Scheduler(
 
     def init_profiler(self) -> None:
         self.profiler_manager = SchedulerProfilerManager(
-            ps=self.ps,
             dp_tp_cpu_group=self.dp_tp_cpu_group,
             get_forward_ct=lambda: self.forward_ct,
         )
@@ -2369,7 +2328,6 @@ class Scheduler(
             token_to_kv_pool_allocator=self.token_to_kv_pool_allocator,
             tree_cache=self.tree_cache,
             offload_tags=self.weight_updater.offload_tags,
-            ps=self.ps,
             model_config=self.model_config,
             enable_overlap=self.enable_overlap,
             spec_algorithm=self.spec_algorithm,
@@ -2457,7 +2415,6 @@ class Scheduler(
         self._sched_idled = False
         self.load_inquirer = SchedulerLoadInquirer(
             disaggregation_mode=self.disaggregation_mode,
-            ps=self.ps,
             server_args=self.server_args,
             max_total_num_tokens=self.max_total_num_tokens,
             max_running_requests=self.max_running_requests,
@@ -2500,7 +2457,6 @@ class Scheduler(
         self.output_streamer = self.get_output_streamer_class()(
             send_to_detokenizer=self.ipc_channels.send_to_detokenizer,
             tree_cache=self.tree_cache,
-            ps=self.ps,
             server_args=self.server_args,
             is_generation=self.is_generation,
             spec_algorithm=self.spec_algorithm,
@@ -3120,7 +3076,7 @@ class Scheduler(
                 self._add_request_to_queue(req)
                 return
 
-        if self.ps.pp_rank == 0 and getattr(
+        if get_parallel().pp_rank == 0 and getattr(
             self.tree_cache.cache_controller, "pp_prefetch_command_group", None
         ):
             recv_req.pp_prefetch_ticketed = bool(self._prefetch_kvcache(req))
@@ -6078,6 +6034,7 @@ def run_scheduler_process(
         ranks=SpawnRanks(
             world_rank=spawn_world_rank(server_args, tp_rank=tp_rank, pp_rank=pp_rank),
             dp_rank=dp_rank,
+            gpu_id=gpu_id,
         ),
     )
     configure_scheduler_process(
@@ -6115,12 +6072,8 @@ def run_scheduler_process(
         scheduler = Scheduler(
             server_args,
             port_args,
-            gpu_id,
             tp_rank,
-            moe_ep_rank,
             pp_rank,
-            attn_cp_rank,
-            moe_dp_rank,
             dp_rank,
         )
 
diff --git a/python/sglang/srt/managers/scheduler_components/dp_attn.py b/python/sglang/srt/managers/scheduler_components/dp_attn.py
index 1e924b179..ae1069b13 100644
--- a/python/sglang/srt/managers/scheduler_components/dp_attn.py
+++ b/python/sglang/srt/managers/scheduler_components/dp_attn.py
@@ -7,7 +7,6 @@ import torch
 
 from sglang.srt.batch_overlap.two_batch_overlap import TboDPAttentionPreparer
 from sglang.srt.configs.model_config import ModelConfig
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.environ import envs
 from sglang.srt.layers.cp.utils import get_cp_strategy
 from sglang.srt.layers.dp_attention import dp_gather_width, world_dp_gather_enabled
@@ -537,7 +536,6 @@ class SchedulerDPAttnAdapter:
     token_to_kv_pool_allocator: BaseTokenToKVPoolAllocator
     tree_cache: BasePrefixCache
     offload_tags: set[str]
-    ps: ParallelState
     model_config: ModelConfig
     enable_overlap: bool
     spec_algorithm: SpeculativeAlgorithm
diff --git a/python/sglang/srt/managers/scheduler_components/load_inquirer.py b/python/sglang/srt/managers/scheduler_components/load_inquirer.py
index 104a52c73..4764a7687 100644
--- a/python/sglang/srt/managers/scheduler_components/load_inquirer.py
+++ b/python/sglang/srt/managers/scheduler_components/load_inquirer.py
@@ -17,7 +17,6 @@ from sglang.srt.managers.load_snapshot import (
 from sglang.srt.runtime_context import get_lora, get_parallel
 
 if TYPE_CHECKING:
-    from sglang.srt.distributed.parallel_state_wrapper import ParallelState
     from sglang.srt.managers.scheduler_components.pool_stats_observer import (
         SchedulerPoolStatsObserver,
     )
@@ -33,7 +32,6 @@ logger = logging.getLogger(__name__)
 @dataclass(kw_only=True, slots=True, frozen=True)
 class SchedulerLoadInquirer:
     disaggregation_mode: DisaggregationMode
-    ps: ParallelState
     server_args: ServerArgs
     max_total_num_tokens: int
     max_running_requests: int
diff --git a/python/sglang/srt/managers/scheduler_components/metrics_reporter.py b/python/sglang/srt/managers/scheduler_components/metrics_reporter.py
index f8be4ab2a..171b13813 100644
--- a/python/sglang/srt/managers/scheduler_components/metrics_reporter.py
+++ b/python/sglang/srt/managers/scheduler_components/metrics_reporter.py
@@ -308,7 +308,7 @@ class SchedulerMetricsReporter:
         self.scheduler.enable_fpm = False
         if (
             get_observability().enable_forward_pass_metrics
-            and self.scheduler.ps.attn_tp_rank == 0
+            and get_parallel().attn_tp_rank == 0
             and get_parallel().pp_rank == get_parallel().pp_size - 1
         ):
             from sglang.srt.observability.forward_pass_metrics import (
@@ -316,9 +316,7 @@ class SchedulerMetricsReporter:
             )
 
             self.scheduler._fpm_dp_rank = (
-                self.scheduler.ps.dp_rank
-                if self.scheduler.ps.dp_rank is not None
-                else 0
+                get_parallel().dp_rank if get_parallel().dp_rank is not None else 0
             )
             self.scheduler._fpm_worker_id = (
                 get_observability().forward_pass_metrics_worker_id
@@ -483,9 +481,9 @@ class SchedulerMetricsReporter:
         num_layers = float(getattr(model_config, "num_attention_layers", 0))
         head_dim = float(getattr(model_config, "head_dim", 0))
         num_attn_heads = float(
-            model_config.get_num_attention_heads(self.scheduler.ps.tp_size)
+            model_config.get_num_attention_heads(get_parallel().tp_size)
         )
-        num_kv_heads = float(model_config.get_num_kv_heads(self.scheduler.ps.tp_size))
+        num_kv_heads = float(model_config.get_num_kv_heads(get_parallel().tp_size))
         intermediate_size = getattr(hf_text_config, "intermediate_size", None)
         if intermediate_size is None:
             intermediate_size = getattr(hf_text_config, "ffn_hidden_size", 0)
diff --git a/python/sglang/srt/managers/scheduler_components/output_streamer.py b/python/sglang/srt/managers/scheduler_components/output_streamer.py
index 27250f484..197644589 100644
--- a/python/sglang/srt/managers/scheduler_components/output_streamer.py
+++ b/python/sglang/srt/managers/scheduler_components/output_streamer.py
@@ -19,7 +19,6 @@ from sglang.srt.beam_search.output import (
     pack_beam_search_output,
 )
 from sglang.srt.disaggregation.utils import DisaggregationMode
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.environ import envs
 from sglang.srt.managers.io_struct import (
     BatchEmbeddingOutput,
@@ -53,7 +52,6 @@ class SchedulerOutputStreamer:
 
     send_to_detokenizer: zmq.Socket
     tree_cache: BasePrefixCache
-    ps: ParallelState
     server_args: ServerArgs
     is_generation: bool
     spec_algorithm: SpeculativeAlgorithm
diff --git a/python/sglang/srt/managers/scheduler_components/profiler_manager.py b/python/sglang/srt/managers/scheduler_components/profiler_manager.py
index e5b7385c3..2791c3a4b 100644
--- a/python/sglang/srt/managers/scheduler_components/profiler_manager.py
+++ b/python/sglang/srt/managers/scheduler_components/profiler_manager.py
@@ -51,14 +51,12 @@ logger = logging.getLogger(__name__)
 
 @dataclass(kw_only=True)
 class SchedulerProfilerManager:
-    ps: Any
     dp_tp_cpu_group: Any
     get_forward_ct: Callable[[], int]
 
     def __post_init__(self) -> None:
         if envs.SGLANG_PROFILE_V2.get():
             self._profile_manager = ProfileManager(
-                ps=self.ps,
                 cpu_group=self.dp_tp_cpu_group,
             )
             return
@@ -274,7 +272,7 @@ class SchedulerProfilerManager:
             self.profile_in_progress = True
 
         if "CUDA_PROFILER" in activities:
-            if self.ps.gpu_id == get_device().base_gpu_id:
+            if get_device().gpu_id == get_device().base_gpu_id:
                 torch.cuda.cudart().cudaProfilerStart()
             self.profile_in_progress = True
 
@@ -387,7 +385,7 @@ class SchedulerProfilerManager:
             torch.cuda.memory._record_memory_history(enabled=None)
 
         if "CUDA_PROFILER" in self.profiler_activities:
-            if self.ps.gpu_id == get_device().base_gpu_id:
+            if get_device().gpu_id == get_device().base_gpu_id:
                 torch.cuda.cudart().cudaProfilerStop()
 
         merge_message = self._merge_profile_traces()
diff --git a/python/sglang/srt/managers/tp_worker.py b/python/sglang/srt/managers/tp_worker.py
index 23f849cd7..f00aa167d 100644
--- a/python/sglang/srt/managers/tp_worker.py
+++ b/python/sglang/srt/managers/tp_worker.py
@@ -22,7 +22,6 @@ from typing import TYPE_CHECKING, List, Optional, Tuple
 import torch
 
 from sglang.srt.beam_search.logits_capture import capture_pre_sample_logits
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.environ import envs
 from sglang.srt.managers.io_struct import (
     DestroyWeightsUpdateGroupReqInput,
@@ -216,12 +215,12 @@ class BaseTpWorker(ABC):
         return success, message
 
     def _deserialize_own_rank(self, serialized_named_tensors):
-        """Each rank deserializes only its own payload (index ps.tp_rank);
+        """Each rank deserializes only its own payload (index tp_rank);
         deserializing another rank's copy would break producer-side CUDA-IPC
         refcounting."""
         monkey_patch_torch_reductions()
         return MultiprocessingSerializer.deserialize(
-            serialized_named_tensors[self.ps.tp_rank]
+            serialized_named_tensors[self.model_runner.tp_rank]
         )
 
     def update_weights_from_tensor(self, recv_req: UpdateWeightsFromTensorReqInput):
@@ -290,12 +289,12 @@ class BaseTpWorker(ABC):
             extra = [n for n in tensors if n not in exp]
             if mismatch or missing or extra:
                 raise RuntimeError(
-                    f"[LORA-CHECK] rank{self.ps.tp_rank} adapter sync MISMATCH of {len(exp)} expected: "
+                    f"[LORA-CHECK] rank{self.model_runner.tp_rank} adapter sync MISMATCH of {len(exp)} expected: "
                     f"{len(mismatch)} value-diff {mismatch[:5]}, {len(missing)} missing {missing[:5]}, "
                     f"{len(extra)} extra {extra[:5]}"
                 )
             logger.info(
-                f"[LORA-CHECK] rank{self.ps.tp_rank} adapter sync OK: {len(exp)}/{len(exp)} tensors match (sha256)"
+                f"[LORA-CHECK] rank{self.model_runner.tp_rank} adapter sync OK: {len(exp)}/{len(exp)} tensors match (sha256)"
             )
         result = self.model_runner.load_lora_adapter_from_tensors(
             recv_req.to_ref(),
@@ -322,7 +321,6 @@ class TpModelWorker(BaseTpWorker):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         is_draft_worker: bool = False,
         req_to_token_pool: Optional[ReqToTokenPool] = None,
@@ -335,7 +333,6 @@ class TpModelWorker(BaseTpWorker):
     ):
         # Parse args
         self.server_args = server_args
-        self.ps = ps
         self.gpu_id = gpu_id
         self.nccl_port = nccl_port
         self.is_draft_worker = is_draft_worker
@@ -411,14 +408,15 @@ class TpModelWorker(BaseTpWorker):
             tp_group = self.model_runner.tp_group
             self.random_seed = broadcast_pyobj(
                 [get_device().random_seed],
-                tp_group.ranks[self.ps.tp_rank],
+                tp_group.ranks[self.model_runner.tp_rank],
                 tp_group.cpu_group,
                 src=tp_group.ranks[0],
             )[0]
         else:
             self.random_seed = broadcast_pyobj(
                 [get_device().random_seed],
-                self.ps.tp_size * get_parallel().pp_rank + self.ps.tp_rank,
+                self.model_runner.tp_size * get_parallel().pp_rank
+                + self.model_runner.tp_rank,
                 self.world_group.cpu_group,
                 src=self.world_group.ranks[0],
             )[0]
@@ -521,7 +519,6 @@ class TpModelWorker(BaseTpWorker):
             model_config=self.model_config,
             mem_fraction_static=get_schedule().mem_fraction_static,
             gpu_id=self.gpu_id,
-            ps=self.ps,
             nccl_port=self.nccl_port,
             server_args=self.server_args,
             is_draft_worker=self.is_draft_worker,
@@ -542,7 +539,6 @@ class TpModelWorker(BaseTpWorker):
                     model_config=self.model_config,
                     mem_fraction_static=get_schedule().mem_fraction_static,
                     gpu_id=self.gpu_id,
-                    ps=self.ps,
                     nccl_port=self.nccl_port,
                     server_args=self.server_args,
                     is_draft_worker=self.is_draft_worker,
diff --git a/python/sglang/srt/model_executor/forward_batch_info.py b/python/sglang/srt/model_executor/forward_batch_info.py
index 0bf416116..57b33faf7 100644
--- a/python/sglang/srt/model_executor/forward_batch_info.py
+++ b/python/sglang/srt/model_executor/forward_batch_info.py
@@ -1102,13 +1102,12 @@ class ForwardBatch(ForwardBatchDeepSeekMHAMixin):
             model_runner.lora_manager.prepare_lora_batch(ret)
 
         if (
-            model_runner.ps.attn_dcp_size > 1
+            model_runner.attn_dcp_size > 1
             and ret.out_cache_loc is not None
             and is_hip()
         ):
             ret.dcp_kv_mask = (
-                ret.positions % model_runner.ps.attn_dcp_size
-                == model_runner.ps.attn_dcp_rank
+                ret.positions % model_runner.attn_dcp_size == model_runner.attn_dcp_rank
             )
 
         return ret
diff --git a/python/sglang/srt/model_executor/model_runner.py b/python/sglang/srt/model_executor/model_runner.py
index 948b95487..517ced8a8 100644
--- a/python/sglang/srt/model_executor/model_runner.py
+++ b/python/sglang/srt/model_executor/model_runner.py
@@ -37,7 +37,6 @@ from sglang.srt.distributed import bootstrap
 from sglang.srt.distributed.device_communicators.mooncake_transfer_engine import (
     maybe_init_shared_mooncake_transfer_engine,
 )
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.dllm.config import DllmConfig
 from sglang.srt.elastic_ep.elastic_ep import (
     ElasticEPStateManager,
@@ -322,7 +321,6 @@ class ModelRunner:
         model_config: ModelConfig,
         mem_fraction_static: float,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         server_args: ServerArgs,
         is_draft_worker: bool = False,
@@ -339,7 +337,6 @@ class ModelRunner:
         # `server_args._draft_pool_config` mutation hack).
         self.memory_pool_config = memory_pool_config
         self.gpu_id = gpu_id
-        self.ps = ps
         self.model_config = model_config
         self.dist_port = nccl_port
         self.server_args = server_args
@@ -416,12 +413,12 @@ class ModelRunner:
         # Set device early so that TransferEngine init (e.g. Ascend NPU)
         # can access the device context.
         try:
-            torch.get_device_module(self.device).set_device(ps.gpu_id)
+            torch.get_device_module(self.device).set_device(get_device().gpu_id)
         except Exception:
             import os
 
             logger.warning(
-                f"Context: {self.device=} {ps.gpu_id=} {os.environ.get('CUDA_VISIBLE_DEVICES')=} {get_parallel().tp_rank=} {get_parallel().tp_size=}"
+                f"Context: {self.device=} {get_device().gpu_id=} {os.environ.get('CUDA_VISIBLE_DEVICES')=} {get_parallel().tp_rank=} {get_parallel().tp_size=}"
             )
             raise
 
@@ -741,7 +738,6 @@ class ModelRunner:
         self.eplb_manager = (
             EPLBManager(
                 model_config=self.model_config,
-                ps=self.ps,
                 get_model=lambda: self.model,
                 get_expert_location_updater=lambda: self.expert_location_updater,
                 get_expert_backup_client=lambda: self.expert_backup_client,
@@ -805,8 +801,8 @@ class ModelRunner:
     def get_pp_proxy_dspark_hidden_size(self) -> int:
         return misc_utils.resolve_pp_proxy_dspark_hidden_size(
             model=self.model,
-            pp_size=self.ps.pp_size,
-            pp_rank=self.ps.pp_rank,
+            pp_size=self.pp_size,
+            pp_rank=self.pp_rank,
         )
 
     def get_pp_proxy_topk_size(self) -> Optional[int]:
@@ -1175,7 +1171,6 @@ class ModelRunner:
             server_args=self.server_args,
             model_config=self.model_config,
             device=self.device,
-            ps=self.ps,
             dist_port=self.dist_port,
             is_draft_worker=self.is_draft_worker,
             local_omp_cpuid=self.local_omp_cpuid if self.device == "cpu" else None,
@@ -1197,6 +1192,10 @@ class ModelRunner:
         self.pp_size = parallel.pp_size
         self.attn_cp_rank = parallel.attn_cp_rank
         self.attn_cp_size = parallel.attn_cp_size
+        self.attn_dcp_rank = parallel.attn_dcp_rank
+        self.attn_dcp_size = parallel.attn_dcp_size
+        self.moe_ep_size = parallel.moe_ep_size
+        self.dp_rank = parallel.dp_rank
 
     def init_shared_mooncake_transfer_engine(self):
         maybe_init_shared_mooncake_transfer_engine(gpu_id=self.gpu_id)
diff --git a/python/sglang/srt/model_executor/pool_configurator.py b/python/sglang/srt/model_executor/pool_configurator.py
index d70e248cf..49304cb48 100644
--- a/python/sglang/srt/model_executor/pool_configurator.py
+++ b/python/sglang/srt/model_executor/pool_configurator.py
@@ -220,7 +220,7 @@ class DefaultPoolConfigurator(MemoryPoolConfigurator):
             self._cell_size == 0
             and mambaish is not None
             and bool(mambaish.full_attention_layer_ids)
-            and kvc.ps.pp_size > 1
+            and kvc.pp_size > 1
         )
         self._zero_kv_max_tokens = (
             torch.iinfo(torch.int64).max
@@ -877,7 +877,7 @@ class SWAChunkCapPoolConfigurator(HybridSWAPoolConfigurator):
         self._swa_cap = compute_swa_request_cap(
             page_size=kvc.page_size,
             window=kvc.sliding_window_size,
-            attn_dp_size=kvc.ps.attn_dp_size,
+            attn_dp_size=kvc.attn_dp_size,
         )
 
     @staticmethod
@@ -1015,7 +1015,7 @@ class DSV4PoolConfigurator(MemoryPoolConfigurator):
         self.compression_ratios = cfg.compress_ratios[
             kvc.layer_info.start_layer : kvc.layer_info.end_layer
         ]
-        if kvc.ps.pp_size > 1:
+        if kvc.pp_size > 1:
             logger.info(
                 f"DSV4 pool PP slice: rank={kvc.pp_group.rank_in_group} "
                 f"layers=[{kvc.layer_info.start_layer},{kvc.layer_info.end_layer}) "
@@ -1032,9 +1032,9 @@ class DSV4PoolConfigurator(MemoryPoolConfigurator):
         self.page_size = kvc.page_size
         self.is_speculative = get_spec().speculative_algorithm is not None
         self.online_c128_mtp_max_draft_tokens = max_speculative_num_draft_tokens() or 0
-        self.attn_dp_size = kvc.ps.attn_dp_size
+        self.attn_dp_size = kvc.attn_dp_size
         self.requested_max_running_requests_per_worker = (
-            get_schedule().max_running_requests // kvc.ps.attn_dp_size
+            get_schedule().max_running_requests // kvc.attn_dp_size
             if get_schedule().max_running_requests is not None
             else None
         )
diff --git a/python/sglang/srt/model_executor/runner/base_runner.py b/python/sglang/srt/model_executor/runner/base_runner.py
index 39032b131..39e1970c6 100644
--- a/python/sglang/srt/model_executor/runner/base_runner.py
+++ b/python/sglang/srt/model_executor/runner/base_runner.py
@@ -547,9 +547,9 @@ class BaseRunner(ABC):
             if (
                 capture_forward_mode == ForwardMode.EXTEND
                 and get_parallel().pp_rank != 0
-                and mr.ps.attn_cp_size > 1
+                and mr.attn_cp_size > 1
             ):
-                pp_hidden_tokens = num_tokens // mr.ps.attn_cp_size
+                pp_hidden_tokens = num_tokens // mr.attn_cp_size
             pp_proxy_tensors = PPProxyTensors(
                 {k: v[:pp_hidden_tokens] for k, v in buffers.pp_proxy_tensors.items()}
             )
diff --git a/python/sglang/srt/model_executor/runner/eager_runner.py b/python/sglang/srt/model_executor/runner/eager_runner.py
index 54a01852d..5221ab90e 100644
--- a/python/sglang/srt/model_executor/runner/eager_runner.py
+++ b/python/sglang/srt/model_executor/runner/eager_runner.py
@@ -296,7 +296,7 @@ class EagerRunner(BaseRunner):
             or cp_active
             or forward_batch.forward_mode.is_target_verify()
         ):
-            if model_runner.ps.attn_dcp_size > 1 and hasattr(
+            if model_runner.attn_dcp_size > 1 and hasattr(
                 model_runner.model, "prepare_context_parallel_metadata_for_dcp"
             ):
                 # prepare kv cache buffer for dcp to gather kv cache
diff --git a/python/sglang/srt/model_executor/runner/flashinfer_autotune.py b/python/sglang/srt/model_executor/runner/flashinfer_autotune.py
index 2f9e89dca..6ef4acbb3 100644
--- a/python/sglang/srt/model_executor/runner/flashinfer_autotune.py
+++ b/python/sglang/srt/model_executor/runner/flashinfer_autotune.py
@@ -147,10 +147,10 @@ def flashinfer_autotune_cache_path(model_runner: ModelRunner) -> Path:
         str(mr.dtype),
         str(get_model().quantization),
         str(get_exec().moe.moe_runner_backend),
-        str(mr.ps.tp_size),
+        str(mr.tp_size),
         str(get_parallel().pp_size),
-        str(mr.ps.attn_dp_size),
-        str(mr.ps.moe_ep_size),
+        str(mr.attn_dp_size),
+        str(mr.moe_ep_size),
         str(mr.model_config.hf_config.__class__.__name__),
     ]
     # A different skip policy must not reuse previously tuned tactics.
@@ -171,7 +171,7 @@ def flashinfer_autotune_cache_path(model_runner: ModelRunner) -> Path:
     cache_dir.mkdir(parents=True, exist_ok=True)
     return (
         cache_dir
-        / f"rank_tp{mr.ps.tp_rank}_pp{get_parallel().pp_rank}_dp{mr.ps.dp_rank or 0}.json"
+        / f"rank_tp{mr.tp_rank}_pp{get_parallel().pp_rank}_dp{mr.dp_rank or 0}.json"
     )
 
 
diff --git a/python/sglang/srt/ray/scheduler_actor.py b/python/sglang/srt/ray/scheduler_actor.py
index cfd97a58a..5a13dd1e9 100644
--- a/python/sglang/srt/ray/scheduler_actor.py
+++ b/python/sglang/srt/ray/scheduler_actor.py
@@ -21,7 +21,7 @@ from typing import Any, Dict, Optional
 import ray
 
 from sglang.srt.arg_groups.overrides import declare_resolution
-from sglang.srt.runtime_context import SpawnRanks, publish, spawn_world_rank
+from sglang.srt.runtime_context import SpawnRanks, get_device, publish, spawn_world_rank
 from sglang.srt.server_args import PortArgs, ServerArgs
 
 logger = logging.getLogger(__name__)
@@ -93,6 +93,7 @@ class SchedulerActor:
                     server_args, tp_rank=tp_rank, pp_rank=pp_rank
                 ),
                 dp_rank=dp_rank,
+                gpu_id=actual_gpu_id,
             ),
         )
 
@@ -124,12 +125,8 @@ class SchedulerActor:
         self.scheduler = Scheduler(
             server_args=server_args,
             port_args=port_args,
-            gpu_id=actual_gpu_id,
             tp_rank=tp_rank,
-            moe_ep_rank=moe_ep_rank,
             pp_rank=pp_rank,
-            attn_cp_rank=attn_cp_rank,
-            moe_dp_rank=moe_dp_rank,
             dp_rank=dp_rank,
         )
 
@@ -146,7 +143,7 @@ class SchedulerActor:
             import torch
 
             # Need to set the GPU id for the event loop for nccl to work
-            torch.cuda.set_device(self.scheduler.ps.gpu_id)
+            torch.cuda.set_device(get_device().gpu_id)
             self.scheduler.run_event_loop()
         except Exception as e:
             logger.error(f"Scheduler PP{self._pp_rank} TP{self._tp_rank} crashed: {e}")
diff --git a/python/sglang/srt/runtime_context.py b/python/sglang/srt/runtime_context.py
index da4320175..77e67b2c4 100644
--- a/python/sglang/srt/runtime_context.py
+++ b/python/sglang/srt/runtime_context.py
@@ -1119,7 +1119,7 @@ def _install_derived_leaves(tops: dict, server_args: Any) -> None:
     """
     import importlib
 
-    from sglang.srt.arg_groups.arg_utils import Derived
+    from sglang.srt.arg_groups.arg_utils import _NO_DEFAULT, Derived
     from sglang.srt.arg_groups.overrides import resolved_view
 
     namespaces = getattr(type(server_args), "_NAMESPACES", None)
@@ -1131,7 +1131,18 @@ def _install_derived_leaves(tops: dict, server_args: Any) -> None:
         if path is None:
             continue
         for name, decl in vars(source).items():
-            if not isinstance(decl, Derived) or not decl.fn:
+            if not isinstance(decl, Derived):
+                continue
+            if not decl.fn:
+                # Nothing computes it. Seed the ones whose absence is itself an
+                # answer, so a process that never states one still reads it;
+                # the rest stay unwritten and say so when read.
+                if decl.default is not _NO_DEFAULT:
+                    bag = tops.get(path.split(".")[0])
+                    for segment in path.split(".")[1:]:
+                        bag = bag and getattr(bag, segment, None)
+                    if bag is not None:
+                        bag._set(name, decl.default)
                 continue
             module, _, attr = decl.fn.rpartition(".")
             bag = tops.get(path.split(".")[0])
@@ -1251,7 +1262,20 @@ class RuntimeContext:
         # Snapshot resolved config into the namespace bags (the single source of
         # truth for config reads). Placed by `namespace_of`; a mock/partial
         # config that declares no namespace yields an empty tree (no bags).
+        # A name the configuration does not carry survives the re-projection.
+        # `gpu_id` is stated by the spawn, not derived, so rebuilding the bags
+        # from the record must not unwrite it -- the record has no field for it
+        # to be rebuilt from.
+        stated = {}
+        if self._config_bags is not None:
+            device = self._config_bags.get("device")
+            fields = object.__getattribute__(device, "_fields") if device else {}
+            if "gpu_id" in fields:
+                stated["gpu_id"] = fields["gpu_id"]
         self._config_bags = _build_config_bags(server_args)
+        device = self._config_bags.get("device")
+        if stated and device is not None:
+            device._set("gpu_id", stated["gpu_id"])
         spec = self._config_bags.get("spec")
         if spec is not None:
             from sglang.srt.arg_groups.overrides import (
@@ -1818,8 +1842,13 @@ def publish(
     # never built. With DCP on it is a position, and the bundle below states it.
     if not _CONTEXT.parallel.dcp_enabled:
         _CONTEXT.parallel.override_permanently(attn_dcp_rank=0)
-    if ranks is not None and ranks.gpu_id is not None:
-        _CONTEXT.override("spawn", gpu_id=ranks.gpu_id)
+    # Stated on the bag directly: `gpu_id` is declared but not configured, so
+    # it is not a leaf `override` can route, and the spawn is the only thing
+    # that knows it. Written whatever it is, `None` included -- most roles run
+    # on no device, and that is an answer rather than a name nobody wrote.
+    _CONTEXT.config_bag("device")._set(
+        "gpu_id", ranks.gpu_id if ranks is not None else None
+    )
     if ranks is not None:
         # The placement, worked out here rather than carried: the widths are on
         # the bag a moment ago, and `world_rank` fixes the rest. A read of any
@@ -1882,7 +1911,7 @@ def _attention_ranks(parallel, tp_rank: int) -> dict:
     The widths are already on the bag -- `publish` computed them a moment ago --
     and the rank comes from the spawn, so the position is known here, before any
     process group exists. That is the point: a rank read then works in a process
-    that never initialises distributed, which is what `ParallelState` provided
+    that never initialises distributed, which is what the per-runner record used to provide
     by being a plain frozen record.
 
     These are stamped rather than written as bag leaves because they are
diff --git a/python/sglang/srt/rust_server/server.py b/python/sglang/srt/rust_server/server.py
index 3c71bb9c9..ef4437a75 100644
--- a/python/sglang/srt/rust_server/server.py
+++ b/python/sglang/srt/rust_server/server.py
@@ -119,17 +119,17 @@ class RustServer:
         os.environ.setdefault("TOKENIZERS_PARALLELISM", "false")
 
         # Preserve the DP startup log; ports use node-local offsets.
-        dp_rank = scheduler.ps.attn_dp_rank if scheduler.ps.dp_size > 1 else None
+        dp_rank = get_parallel().attn_dp_rank if get_parallel().dp_size > 1 else None
         if get_exec().moe.is_ep_scale_joiner:
             # The joining TP group is entirely local to this node.
-            tp_size_per_node = scheduler.ps.tp_size
+            tp_size_per_node = get_parallel().tp_size
         else:
             nnodes_per_pp_rank = max(get_parallel().nnodes // get_parallel().pp_size, 1)
-            tp_size_per_node = scheduler.ps.tp_size // nnodes_per_pp_rank
-        dp_group_width = scheduler.ps.attn_tp_size * scheduler.ps.attn_cp_size
+            tp_size_per_node = get_parallel().tp_size // nnodes_per_pp_rank
+        dp_group_width = get_parallel().attn_tp_size * get_parallel().attn_cp_size
         # Count DP leaders within this node's TP range. The first leader must
         # use the base port even when a DP group spans multiple nodes.
-        local_dp_rank = (scheduler.ps.tp_rank % tp_size_per_node) // dp_group_width
+        local_dp_rank = (get_parallel().tp_rank % tp_size_per_node) // dp_group_width
         listen_port = get_serving().port + local_dp_rank
         listen_addr = NetworkAddress(get_serving().host, listen_port).to_host_port_str()
 
@@ -179,7 +179,7 @@ class RustServer:
         # Under DP every rank runs its own server on its own port, so the rank is
         # what tells two otherwise identical startup lines apart.
         dp_note = (
-            "" if dp_rank is None else f" (DP rank {dp_rank}/{scheduler.ps.dp_size})"
+            "" if dp_rank is None else f" (DP rank {dp_rank}/{get_parallel().dp_size})"
         )
         logger.info(
             "SGLANG_RUST_SERVER enabled, Rust server listen on %s%s",
diff --git a/python/sglang/srt/speculative/dflash_worker_v2.py b/python/sglang/srt/speculative/dflash_worker_v2.py
index e26a0eaf9..58348432f 100644
--- a/python/sglang/srt/speculative/dflash_worker_v2.py
+++ b/python/sglang/srt/speculative/dflash_worker_v2.py
@@ -1,7 +1,6 @@
 import logging
 import math
 import os
-from dataclasses import replace
 from typing import List, Optional, Tuple
 
 import torch
@@ -19,7 +18,6 @@ from sglang.kernels.ops.speculative.dspark.dspark_accept import (
     accept_sampling,
 )
 from sglang.srt.configs.hybrid_arch import mambaish_config
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.environ import envs
 from sglang.srt.layers.logits_processor import should_apply_lm_head_quant_method
 from sglang.srt.layers.logprob_processor import compute_spec_logprobs
@@ -364,7 +362,6 @@ class DFlashWorkerV2(BaseSpecWorker):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         target_worker: TpModelWorker,
     ):
@@ -372,7 +369,6 @@ class DFlashWorkerV2(BaseSpecWorker):
 
         self.server_args = server_args
         self.gpu_id = gpu_id
-        self.ps = ps
         self.nccl_port = nccl_port
         self._target_worker = target_worker
         self.model_runner = target_worker.model_runner
@@ -416,7 +412,6 @@ class DFlashWorkerV2(BaseSpecWorker):
             bundle = build_draft_tp_worker(
                 server_args=server_args,
                 gpu_id=gpu_id,
-                ps=replace(ps, pp_rank=0, pp_size=1),
                 nccl_port=nccl_port,
                 target_model_config=target_worker.model_runner.model_config,
                 algo_label="DFLASH",
@@ -453,7 +448,7 @@ class DFlashWorkerV2(BaseSpecWorker):
             validate_domino_runtime(
                 device=torch.device(self.device),
                 tp_size=int(get_parallel().tp_group.world_size),
-                tp_rank=int(self.ps.tp_rank),
+                tp_rank=int(self.model_runner.tp_rank),
                 target_vocab_size=int(self.model_runner.model_config.vocab_size),
                 draft_vocab_size=int(self.draft_model_runner.model_config.vocab_size),
                 hidden_size=int(self.draft_model.config.hidden_size),
@@ -500,7 +495,7 @@ class DFlashWorkerV2(BaseSpecWorker):
         )
         self._maybe_merge_trained_mask_embedding()
         self._cache_full_embed_weight()
-        if self.ps.tp_rank == 0:
+        if self.model_runner.tp_rank == 0:
             logger.info(
                 "Initialized DFLASH draft runner. attention_backend=%s, model=%s, block_size=%s, draft_window_size=%s, compact_cache=%s",
                 bundle.resolved_attention_backend,
@@ -650,7 +645,7 @@ class DFlashWorkerV2(BaseSpecWorker):
                 # shared graph capture/replay; keep the draft eager under dp
                 # attention.
                 capture_decode_cuda_graph = False
-                if self.ps.tp_rank == 0:
+                if self.model_runner.tp_rank == 0:
                     logger.warning(
                         "Disable DFLASH draft cuda graph because dp attention "
                         "is enabled (draft runs eager)."
@@ -795,7 +790,7 @@ class DFlashWorkerV2(BaseSpecWorker):
 
     def _maybe_build_draft_sampler(self):
         def _eager(reason):
-            if self.ps.tp_rank == 0:
+            if self.model_runner.tp_rank == 0:
                 logger.info("DFLASH draft greedy head kept eager (reason=%s).", reason)
             return None
 
@@ -819,7 +814,7 @@ class DFlashWorkerV2(BaseSpecWorker):
             ):
                 return _eager("unsupported quantized lm_head")
             self.draft_model.lm_head = lm_head
-            if self.ps.tp_rank == 0:
+            if self.model_runner.tp_rank == 0:
                 logger.info(
                     "DFLASH selector decode folded into the draft cuda graph "
                     "(sampling_enabled=%s).",
@@ -843,7 +838,7 @@ class DFlashWorkerV2(BaseSpecWorker):
             embed_proj = self.draft_model.embed_proj
             if prefix_gru is None or embed_proj is None:
                 return _eager("Domino projector modules are unavailable")
-            if self.ps.tp_rank == 0:
+            if self.model_runner.tp_rank == 0:
                 logger.info(
                     "DFLASH Domino rollout folded into the draft cuda graph (tp=%s).",
                     int(tp_group.world_size),
@@ -882,7 +877,7 @@ class DFlashWorkerV2(BaseSpecWorker):
                 return _eager("added vocab")
             num_org = int(shard.num_org_elements)
             org_vocab_start = int(shard.org_vocab_start_index)
-        if self.ps.tp_rank == 0:
+        if self.model_runner.tp_rank == 0:
             logger.info(
                 "DFLASH draft greedy head folded into the draft cuda graph (tp=%d).",
                 tp_group.world_size,
@@ -908,7 +903,7 @@ class DFlashWorkerV2(BaseSpecWorker):
                 fused_disable_reason = "draft model does not support fused context KV"
 
             if fused_disable_reason is not None:
-                if self.ps.tp_rank == 0:
+                if self.model_runner.tp_rank == 0:
                     logger.info(
                         "DFLASH fused KV materialization disabled: %s",
                         fused_disable_reason,
@@ -951,7 +946,7 @@ class DFlashWorkerV2(BaseSpecWorker):
                     break
 
             if fused_disable_reason is not None:
-                if self.ps.tp_rank == 0:
+                if self.model_runner.tp_rank == 0:
                     logger.info(
                         "DFLASH fused KV materialization disabled: %s",
                         fused_disable_reason,
@@ -973,7 +968,7 @@ class DFlashWorkerV2(BaseSpecWorker):
                 max_position_hint=self.target_worker.model_runner.model_config.context_len
                 + int(self.block_size),
             )
-            if self.ps.tp_rank == 0:
+            if self.model_runner.tp_rank == 0:
                 logger.info(
                     "DFLASH fused KV materialization enabled. "
                     "n_layers=%d, num_kv_heads=%d, head_dim=%d",
@@ -1266,7 +1261,7 @@ class DFlashWorkerV2(BaseSpecWorker):
                     embedding_tensor.to(embed_module.weight.dtype)
                 )
 
-        if self.ps.tp_rank == 0:
+        if self.model_runner.tp_rank == 0:
             logger.info(
                 "Merged trained mask embedding into target model "
                 "(mask_token_id=%s, source=%s)",
@@ -1301,7 +1296,7 @@ class DFlashWorkerV2(BaseSpecWorker):
         parts = [torch.empty_like(shard_t) for _ in range(tp_size)]
         dist.all_gather(parts, shard_t, group=tp_group.device_group)
         self._full_embed_gpu = torch.cat(parts, dim=0)[:vocab_size]
-        if self.ps.tp_rank == 0:
+        if self.model_runner.tp_rank == 0:
             logger.info(
                 "DFLASH cached full embed on GPU for dp attention: shape=%s",
                 list(self._full_embed_gpu.shape),
@@ -1364,7 +1359,7 @@ class DFlashWorkerV2(BaseSpecWorker):
             if resolved_id is None:
                 resolved_id = tokenizer.convert_tokens_to_ids(mask_token)
 
-            if added and self.ps.tp_rank == 0:
+            if added and self.model_runner.tp_rank == 0:
                 logger.info(
                     "Added DFLASH mask token to tokenizer. token=%s, mask_token_id=%s, tokenizer_len=%s, model_vocab_size=%s",
                     mask_token,
@@ -2179,7 +2174,7 @@ class DFlashWorkerV2(BaseSpecWorker):
         if self.selector is not None:
             if self._selector_sampling_enabled:
                 return
-            if not self._warned_sampling_fallback and self.ps.tp_rank == 0:
+            if not self._warned_sampling_fallback and self.model_runner.tp_rank == 0:
                 logger.warning(
                     "DFLASH non-greedy verification is unavailable on this "
                     "build/device; falling back to greedy argmax verification. "
@@ -2192,7 +2187,7 @@ class DFlashWorkerV2(BaseSpecWorker):
         if (
             not is_dflash_sampling_verify_available()
             and not self._warned_sampling_fallback
-            and self.ps.tp_rank == 0
+            and self.model_runner.tp_rank == 0
         ):
             logger.warning(
                 "DFLASH non-greedy verification is unavailable on this build/device; "
diff --git a/python/sglang/srt/speculative/draft_worker_common.py b/python/sglang/srt/speculative/draft_worker_common.py
index 52f7f4547..9387550f4 100644
--- a/python/sglang/srt/speculative/draft_worker_common.py
+++ b/python/sglang/srt/speculative/draft_worker_common.py
@@ -16,7 +16,6 @@ from sglang.srt.speculative.dflash_info_v2 import DFlashDraftInputV2
 
 if TYPE_CHECKING:
     from sglang.srt.configs.model_config import ModelConfig
-    from sglang.srt.distributed.parallel_state_wrapper import ParallelState
     from sglang.srt.model_executor.model_runner import ModelRunner
 
 logger = logging.getLogger(__name__)
@@ -63,7 +62,6 @@ def build_draft_tp_worker(
     *,
     server_args: ServerArgs,
     gpu_id: int,
-    ps: ParallelState,
     nccl_port: int,
     target_model_config: ModelConfig,
     algo_label: str,
@@ -88,7 +86,6 @@ def build_draft_tp_worker(
         draft_worker = draft_worker_cls(
             server_args=server_args,
             gpu_id=gpu_id,
-            ps=ps,
             nccl_port=nccl_port,
             is_draft_worker=True,
             random_seed=random_seed,
diff --git a/python/sglang/srt/speculative/dspark_components/dspark_worker_v2.py b/python/sglang/srt/speculative/dspark_components/dspark_worker_v2.py
index e347f285d..70444fa68 100644
--- a/python/sglang/srt/speculative/dspark_components/dspark_worker_v2.py
+++ b/python/sglang/srt/speculative/dspark_components/dspark_worker_v2.py
@@ -1,6 +1,5 @@
 import logging
 from contextlib import nullcontext
-from dataclasses import replace
 from typing import Callable, Optional, Protocol, runtime_checkable
 
 import torch
@@ -9,8 +8,6 @@ from sglang.kernels.ops.attention.dsv4.unified_kv_kernels.env_gate import (
     is_unified_kv_triton,
 )
 from sglang.srt.configs.hybrid_arch import mambaish_config
-from sglang.srt.distributed import get_pp_group
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.environ import envs
 from sglang.srt.layers.logprob_processor import compute_spec_logprobs
 from sglang.srt.lora.layers import unwrap_lora_layer
@@ -134,7 +131,6 @@ class DSparkWorkerV2(BaseSpecWorker):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         target_worker: TpModelWorker,
         draft_worker_cls: type[TpModelWorker] = TpModelWorker,
@@ -143,14 +139,13 @@ class DSparkWorkerV2(BaseSpecWorker):
 
         self.server_args = server_args
         self.gpu_id = gpu_id
-        self.ps = ps
         self.nccl_port = nccl_port
         self._target_worker = target_worker
         self.model_runner = target_worker.model_runner
         self.page_size = get_schedule().page_size
         self.device = target_worker.device
         self._draft_worker = None
-        self._hosts_draft = get_pp_group().is_last_rank
+        self._hosts_draft = get_parallel().pp_group.is_last_rank
         if not self._hosts_draft:
             return
 
@@ -166,7 +161,7 @@ class DSparkWorkerV2(BaseSpecWorker):
         if (
             get_parallel().enable_dp_attention
             and self._draft_is_moe
-            and ps.attn_tp_size > 1
+            and get_parallel().attn_tp_size > 1
         ):
             raise ValueError(
                 "DSpark + dp attention with a DeepSeek-V4 (MoE) draft requires "
@@ -178,7 +173,6 @@ class DSparkWorkerV2(BaseSpecWorker):
             bundle = build_draft_tp_worker(
                 server_args=server_args,
                 gpu_id=gpu_id,
-                ps=replace(ps, pp_rank=0, pp_size=1),
                 nccl_port=nccl_port,
                 target_model_config=target_worker.model_runner.model_config,
                 algo_label="DSPARK",
@@ -232,7 +226,7 @@ class DSparkWorkerV2(BaseSpecWorker):
             else parallel.tp_group
         )
 
-        if self.ps.tp_rank == 0:
+        if self.model_runner.tp_rank == 0:
             logger.info(
                 "Initialized DSpark draft runner. attention_backend=%s, model=%s, "
                 "gamma=%s, verify_num_draft_tokens=%s, query_token_num=%s, "
@@ -255,7 +249,7 @@ class DSparkWorkerV2(BaseSpecWorker):
         )
 
         if getattr(self.draft_model, "uses_own_vocab_modules", False):
-            if self.ps.tp_rank == 0:
+            if self.model_runner.tp_rank == 0:
                 logger.info(
                     "DSpark draft uses its checkpoint-local embedding and LM head."
                 )
@@ -279,7 +273,7 @@ class DSparkWorkerV2(BaseSpecWorker):
             gamma=self.gamma,
             model_runner=self.model_runner,
             device=self.device,
-            tp_rank=self.ps.tp_rank,
+            tp_rank=self.model_runner.tp_rank,
             verify_num_draft_tokens=self.verify_num_draft_tokens,
             tp_sync=self._tp_sync,
         )
@@ -327,7 +321,7 @@ class DSparkWorkerV2(BaseSpecWorker):
             and self._verify_planner.mode_value == "static"
             and self._draft_is_moe
             and not get_parallel().enable_dp_attention
-            and self.ps.pp_size == 1
+            and self.model_runner.pp_size == 1
         )
         if (
             (self._verify_planner.is_compact_mode or static_epilogue_supported)
@@ -391,7 +385,7 @@ class DSparkWorkerV2(BaseSpecWorker):
             planner=self._verify_planner,
             gamma=self.gamma,
             verify_num_draft_tokens=self.verify_num_draft_tokens,
-            tp_rank=self.ps.tp_rank,
+            tp_rank=self.model_runner.tp_rank,
             device=self.device,
             simulate_acc_len=self._simulate_acc_len,
         )
@@ -451,7 +445,7 @@ class DSparkWorkerV2(BaseSpecWorker):
             draft_model=self.draft_model,
             is_deepseek_v4_draft=self._draft_is_moe,
         )
-        if self._target_hidden_projection_enabled and self.ps.tp_rank == 0:
+        if self._target_hidden_projection_enabled and self.model_runner.tp_rank == 0:
             logger.info(
                 "DSpark prefill target-hidden projection runs before "
                 "sequence-parallel gather."
@@ -508,7 +502,7 @@ class DSparkWorkerV2(BaseSpecWorker):
             gamma=self.gamma,
             max_bs=max(get_exec().graph.cuda_graph_config.decode.bs),
             device=self.device,
-            tp_rank=self.ps.tp_rank,
+            tp_rank=self.model_runner.tp_rank,
             tp_sync=self._tp_sync,
             available_memory_gb=available_memory_gb,
             confidence_fn=(
diff --git a/python/sglang/srt/speculative/eagle_draft_cuda_graph_runner.py b/python/sglang/srt/speculative/eagle_draft_cuda_graph_runner.py
index 5851c005f..0147031cc 100644
--- a/python/sglang/srt/speculative/eagle_draft_cuda_graph_runner.py
+++ b/python/sglang/srt/speculative/eagle_draft_cuda_graph_runner.py
@@ -10,6 +10,7 @@ from sglang.srt.compilation.torch_compile_decoration import set_torch_compile_co
 from sglang.srt.environ import envs
 from sglang.srt.layers.dp_attention import (
     DpPaddingMode,
+    deployment_attn_dp_size,
     set_dp_buffer_len,
     set_is_extend_in_batch,
 )
@@ -114,8 +115,8 @@ class EAGLEDraftCudaGraphRunner(DecodeCudaGraphRunner):
         # Fields the parent's capture() reads:
         self.device = model_runner.device
         self.device_module = torch.get_device_module(self.device)
-        self.tp_size = model_runner.ps.tp_size
-        self.attn_dp_size = model_runner.ps.attn_dp_size
+        self.tp_size = model_runner.tp_size
+        self.attn_dp_size = deployment_attn_dp_size()
         self.pp_size = get_parallel().pp_size
         self.enable_torch_compile = get_flags().capture.enable_torch_compile
         self.disable_padding = get_exec().graph.disable_cuda_graph_padding
diff --git a/python/sglang/srt/speculative/eagle_draft_extend_cuda_graph_runner.py b/python/sglang/srt/speculative/eagle_draft_extend_cuda_graph_runner.py
index a60549730..8f542faa1 100644
--- a/python/sglang/srt/speculative/eagle_draft_extend_cuda_graph_runner.py
+++ b/python/sglang/srt/speculative/eagle_draft_extend_cuda_graph_runner.py
@@ -9,6 +9,7 @@ import torch
 from sglang.srt.compilation.torch_compile_decoration import set_torch_compile_config
 from sglang.srt.layers.dp_attention import (
     DpPaddingMode,
+    deployment_attn_dp_size,
     set_dp_buffer_len,
     set_is_extend_in_batch,
 )
@@ -111,8 +112,8 @@ class EAGLEDraftExtendCudaGraphRunner(DecodeCudaGraphRunner):
         # Fields the parent's capture() reads:
         self.device = model_runner.device
         self.device_module = torch.get_device_module(self.device)
-        self.tp_size = model_runner.ps.tp_size
-        self.attn_dp_size = model_runner.ps.attn_dp_size
+        self.tp_size = model_runner.tp_size
+        self.attn_dp_size = deployment_attn_dp_size()
         self.pp_size = get_parallel().pp_size
         self.enable_torch_compile = get_flags().capture.enable_torch_compile
         self.disable_padding = get_exec().graph.disable_cuda_graph_padding
diff --git a/python/sglang/srt/speculative/eagle_worker_v2.py b/python/sglang/srt/speculative/eagle_worker_v2.py
index 3cfa2fdde..836878007 100644
--- a/python/sglang/srt/speculative/eagle_worker_v2.py
+++ b/python/sglang/srt/speculative/eagle_worker_v2.py
@@ -1,14 +1,12 @@
 import contextlib
 import logging
 import time
-from dataclasses import replace
 from typing import List, Optional
 
 import torch
 
 from sglang.kernels.ops.speculative.topk1 import draft_topk1_postprocess
 from sglang.srt.configs.model_config import get_dsa_mtp_topk_width
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.environ import envs
 from sglang.srt.hardware_backend.npu.graph_runner.eagle_draft_extend_npu_graph_runner import (
     EAGLEDraftExtendNpuGraphRunner,
@@ -238,7 +236,6 @@ class EagleDraftWorker(EagleDraftWorkerBase):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         target_worker: TpModelWorker,
     ):
@@ -247,7 +244,6 @@ class EagleDraftWorker(EagleDraftWorkerBase):
         # copy args
         self.server_args = server_args
         self.gpu_id = gpu_id
-        self.ps = ps
         self.nccl_port = nccl_port
         self.target_worker = target_worker
 
@@ -288,8 +284,6 @@ class EagleDraftWorker(EagleDraftWorkerBase):
             self.draft_worker = TpModelWorker(
                 server_args=server_args,
                 gpu_id=gpu_id,
-                # spec workers don't support pipeline parallelism
-                ps=replace(ps, pp_rank=0, pp_size=1),
                 nccl_port=nccl_port,
                 is_draft_worker=True,
                 # The draft runs at absolute target positions.
@@ -1293,7 +1287,6 @@ class EAGLEWorkerV2(BaseSpecWorker):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         target_worker: TpModelWorker,
     ):
@@ -1304,7 +1297,6 @@ class EAGLEWorkerV2(BaseSpecWorker):
         self.topk = get_spec().speculative_eagle_topk
         self.speculative_num_steps = get_spec().speculative_num_steps
         self.speculative_num_draft_tokens = get_spec().speculative_num_draft_tokens
-        self.ps = ps
         self.gpu_id = gpu_id
         self.device = get_device().device
         self._target_worker = target_worker
@@ -1320,7 +1312,6 @@ class EAGLEWorkerV2(BaseSpecWorker):
             EagleDraftWorker(
                 server_args,
                 gpu_id,
-                ps,
                 nccl_port,
                 target_worker,
             )
@@ -1873,7 +1864,7 @@ class EAGLEWorkerV2(BaseSpecWorker):
     def update_weights_from_tensor(self, recv_req: UpdateWeightsFromTensorReqInput):
         monkey_patch_torch_reductions()
         named_tensors = MultiprocessingSerializer.deserialize(
-            recv_req.serialized_named_tensors[self.ps.tp_rank]
+            recv_req.serialized_named_tensors[self.model_runner.tp_rank]
         )
         success, message = (
             self.draft_worker.draft_runner.weight_updater.update_weights_from_tensor(
diff --git a/python/sglang/srt/speculative/frozen_kv_mtp_cuda_graph_runner.py b/python/sglang/srt/speculative/frozen_kv_mtp_cuda_graph_runner.py
index c9a7c76cb..409d2098f 100644
--- a/python/sglang/srt/speculative/frozen_kv_mtp_cuda_graph_runner.py
+++ b/python/sglang/srt/speculative/frozen_kv_mtp_cuda_graph_runner.py
@@ -8,6 +8,7 @@ import torch
 from sglang.srt.compilation.torch_compile_decoration import set_torch_compile_config
 from sglang.srt.layers.dp_attention import (
     DpPaddingMode,
+    deployment_attn_dp_size,
     set_dp_buffer_len,
     set_is_extend_in_batch,
 )
@@ -98,8 +99,8 @@ class FrozenKVMTPCudaGraphRunner(DecodeCudaGraphRunner):
         self.require_mlp_tp_gather = require_mlp_tp_gather()
         self.require_mlp_sync = require_mlp_sync()
         self.require_attn_tp_gather = require_attn_tp_gather()
-        self.tp_size = self.model_runner.ps.tp_size
-        self.attn_dp_size = self.model_runner.ps.attn_dp_size
+        self.tp_size = self.model_runner.tp_size
+        self.attn_dp_size = deployment_attn_dp_size()
         self.pp_size = get_parallel().pp_size
         self.speculative_num_steps = get_spec().speculative_num_steps
         self.topk = get_spec().speculative_eagle_topk
diff --git a/python/sglang/srt/speculative/frozen_kv_mtp_worker_v2.py b/python/sglang/srt/speculative/frozen_kv_mtp_worker_v2.py
index 36353dc19..883975ef8 100644
--- a/python/sglang/srt/speculative/frozen_kv_mtp_worker_v2.py
+++ b/python/sglang/srt/speculative/frozen_kv_mtp_worker_v2.py
@@ -23,12 +23,10 @@ from __future__ import annotations
 
 import logging
 import time
-from dataclasses import replace
 from typing import Optional
 
 import torch
 
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.layers.moe.utils import (
     draft_model_build_scope,
     speculative_moe_a2a_backend_context,
@@ -102,7 +100,6 @@ class FrozenKVMTPDraftWorker(EagleDraftWorkerBase, TpModelWorker):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         target_worker: TpModelWorker,
     ):
@@ -112,7 +109,6 @@ class FrozenKVMTPDraftWorker(EagleDraftWorkerBase, TpModelWorker):
         self.topk = get_spec().speculative_eagle_topk
         self.speculative_num_steps = get_spec().speculative_num_steps
         self.speculative_num_draft_tokens = get_spec().speculative_num_draft_tokens
-        self.ps = ps
         self.gpu_id = gpu_id
         self.device = get_device().device
         self.target_worker = target_worker
@@ -146,8 +142,6 @@ class FrozenKVMTPDraftWorker(EagleDraftWorkerBase, TpModelWorker):
                 self,
                 server_args=server_args,
                 gpu_id=gpu_id,
-                # spec workers don't support pipeline parallelism
-                ps=replace(ps, pp_rank=0, pp_size=1),
                 nccl_port=nccl_port,
                 is_draft_worker=True,
                 # The draft runs at absolute target positions.
@@ -702,7 +696,6 @@ class FrozenKVMTPWorkerV2(EAGLEWorkerV2):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         target_worker: TpModelWorker,
     ):
@@ -715,7 +708,6 @@ class FrozenKVMTPWorkerV2(EAGLEWorkerV2):
         self.topk = get_spec().speculative_eagle_topk
         self.speculative_num_steps = get_spec().speculative_num_steps
         self.speculative_num_draft_tokens = get_spec().speculative_num_draft_tokens
-        self.ps = ps
         self.gpu_id = gpu_id
         self.device = get_device().device
         self._target_worker = target_worker
@@ -730,7 +722,6 @@ class FrozenKVMTPWorkerV2(EAGLEWorkerV2):
         self._draft_worker = FrozenKVMTPDraftWorker(
             server_args,
             gpu_id,
-            ps,
             nccl_port,
             target_worker,
         )
diff --git a/python/sglang/srt/speculative/multi_layer_eagle_draft_extend_cuda_graph_runner.py b/python/sglang/srt/speculative/multi_layer_eagle_draft_extend_cuda_graph_runner.py
index 7a0a371fe..381d84de1 100644
--- a/python/sglang/srt/speculative/multi_layer_eagle_draft_extend_cuda_graph_runner.py
+++ b/python/sglang/srt/speculative/multi_layer_eagle_draft_extend_cuda_graph_runner.py
@@ -155,7 +155,7 @@ class MultiLayerEagleDraftExtendCudaGraphRunner(DecodeCudaGraphRunner):
         # Fields the parent's capture() reads:
         self.device = model_runner.device
         self.device_module = torch.get_device_module(self.device)
-        self.tp_size = model_runner.ps.tp_size
+        self.tp_size = model_runner.tp_size
         self.dp_size = get_parallel().dp_size
         self.pp_size = get_parallel().pp_size
         self.enable_torch_compile = get_flags().capture.enable_torch_compile
diff --git a/python/sglang/srt/speculative/multi_layer_eagle_worker_v2.py b/python/sglang/srt/speculative/multi_layer_eagle_worker_v2.py
index 796e67fa1..67342a701 100644
--- a/python/sglang/srt/speculative/multi_layer_eagle_worker_v2.py
+++ b/python/sglang/srt/speculative/multi_layer_eagle_worker_v2.py
@@ -21,7 +21,6 @@ from typing import TYPE_CHECKING, List
 
 import torch
 
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.environ import envs
 from sglang.srt.hardware_backend.npu.graph_runner.multi_layer_eagle_draft_extend_npu_graph_runner import (
     MultiLayerEagleMultiStepDraftExtendNpuGraphRunner,
@@ -121,7 +120,6 @@ class MultiLayerEagleDraftWorker(EagleDraftWorkerBase):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         target_worker: TpModelWorker,
     ):
@@ -130,7 +128,6 @@ class MultiLayerEagleDraftWorker(EagleDraftWorkerBase):
         # copy args
         self.server_args = server_args
         self.gpu_id = gpu_id
-        self.ps = ps
         self.nccl_port = nccl_port
         self.target_worker = target_worker
         self.draft_extend_attn_backend_list = []
@@ -171,8 +168,6 @@ class MultiLayerEagleDraftWorker(EagleDraftWorkerBase):
             self.draft_worker = TpModelWorker(
                 server_args=server_args,
                 gpu_id=gpu_id,
-                # spec workers don't support pipeline parallelism
-                ps=replace(ps, pp_rank=0, pp_size=1),
                 nccl_port=nccl_port,
                 is_draft_worker=True,
                 is_multi_layer_eagle=True,
@@ -1013,7 +1008,6 @@ class MultiLayerEagleWorkerV2(BaseSpecWorker):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         target_worker: TpModelWorker,
     ):
@@ -1035,7 +1029,6 @@ class MultiLayerEagleWorkerV2(BaseSpecWorker):
         self._draft_worker = MultiLayerEagleDraftWorker(
             server_args,
             gpu_id,
-            ps,
             nccl_port,
             target_worker,
         )
diff --git a/python/sglang/srt/speculative/ngram_worker.py b/python/sglang/srt/speculative/ngram_worker.py
index f753b0b83..66429bbe0 100644
--- a/python/sglang/srt/speculative/ngram_worker.py
+++ b/python/sglang/srt/speculative/ngram_worker.py
@@ -7,7 +7,6 @@ import torch
 from sglang.kernels.ops.speculative.cache_locs import (
     assign_extend_cache_locs_func as assign_extend_cache_locs_func,
 )
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.layers.logprob_processor import compute_spec_logprobs
 from sglang.srt.managers.schedule_batch import ScheduleBatch
 from sglang.srt.managers.scheduler import GenerationBatchResult
@@ -89,7 +88,6 @@ class NGRAMWorker(BaseSpecWorker):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         target_worker: TpModelWorker,
     ):
@@ -99,7 +97,7 @@ class NGRAMWorker(BaseSpecWorker):
         self.enable_overlap = not get_schedule().disable_overlap_schedule
         self._target_worker = target_worker
         self.model_runner = target_worker.model_runner
-        self.tp_rank = ps.tp_rank
+        self.tp_rank = self.model_runner.tp_rank
         self.page_size = get_schedule().page_size
         self.draft_token_num: int = get_spec().speculative_num_draft_tokens
         self.max_trie_depth: int = get_spec().speculative_ngram_max_trie_depth
diff --git a/python/sglang/srt/speculative/standalone_worker_v2.py b/python/sglang/srt/speculative/standalone_worker_v2.py
index 801a54299..508f4e598 100644
--- a/python/sglang/srt/speculative/standalone_worker_v2.py
+++ b/python/sglang/srt/speculative/standalone_worker_v2.py
@@ -1,10 +1,8 @@
 import logging
-from dataclasses import replace
 from typing import Optional
 
 import torch
 
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.layers.moe.utils import (
     draft_model_build_scope,
     speculative_moe_backend_context,
@@ -45,7 +43,6 @@ class StandaloneDraftWorker(EagleDraftWorker):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         target_worker: TpModelWorker,
     ):
@@ -54,7 +51,6 @@ class StandaloneDraftWorker(EagleDraftWorker):
         # copy args
         self.server_args = server_args
         self.gpu_id = gpu_id
-        self.ps = ps
         self.nccl_port = nccl_port
         self.target_worker = target_worker
 
@@ -84,8 +80,6 @@ class StandaloneDraftWorker(EagleDraftWorker):
             self.draft_worker = TpModelWorker(
                 server_args=server_args,
                 gpu_id=gpu_id,
-                # spec workers don't support pipeline parallelism
-                ps=replace(ps, pp_rank=0, pp_size=1),
                 nccl_port=nccl_port,
                 is_draft_worker=True,
                 # The draft runs at absolute target positions.
@@ -167,7 +161,6 @@ class StandaloneWorkerV2(EAGLEWorkerV2):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         target_worker: TpModelWorker,
     ):
@@ -190,7 +183,6 @@ class StandaloneWorkerV2(EAGLEWorkerV2):
         self._draft_worker = StandaloneDraftWorker(
             server_args,
             gpu_id,
-            ps,
             nccl_port,
             target_worker,
         )
diff --git a/python/sglang/srt/speculative/uno_lora.py b/python/sglang/srt/speculative/uno_lora.py
index 09ebd8750..397c9c550 100644
--- a/python/sglang/srt/speculative/uno_lora.py
+++ b/python/sglang/srt/speculative/uno_lora.py
@@ -45,8 +45,8 @@ def init_uno_lora_manager(
         dtype=model_runner.dtype,
         server_args=model_runner.server_args,
         lora_backend="uno_cublas",  # fast path
-        tp_size=model_runner.ps.tp_size,
-        tp_rank=model_runner.ps.tp_rank,
+        tp_size=model_runner.tp_size,
+        tp_rank=model_runner.tp_rank,
         # Infer these from the one trained adapter.
         max_lora_rank=None,
         target_modules=None,
diff --git a/python/sglang/srt/speculative/uno_worker_v2.py b/python/sglang/srt/speculative/uno_worker_v2.py
index ce87e4741..ebd4deba3 100644
--- a/python/sglang/srt/speculative/uno_worker_v2.py
+++ b/python/sglang/srt/speculative/uno_worker_v2.py
@@ -46,7 +46,6 @@ from sglang.srt.utils.common import (
 )
 
 if TYPE_CHECKING:
-    from sglang.srt.distributed.parallel_state_wrapper import ParallelState
     from sglang.srt.managers.schedule_batch import ScheduleBatch
     from sglang.srt.managers.tp_worker import TpModelWorker
     from sglang.srt.server_args import ServerArgs
@@ -62,7 +61,6 @@ class UnoWorkerV2(BaseSpecWorker):
         self,
         server_args: ServerArgs,
         gpu_id: int,
-        ps: ParallelState,
         nccl_port: int,
         target_worker: TpModelWorker,
     ):
@@ -70,7 +68,6 @@ class UnoWorkerV2(BaseSpecWorker):
 
         self.server_args = server_args
         self.gpu_id = gpu_id
-        self.ps = ps
         self.nccl_port = nccl_port
 
         self._target_worker = target_worker
diff --git a/python/sglang/srt/utils/profile_utils.py b/python/sglang/srt/utils/profile_utils.py
index 6fa991316..6b011f12c 100644
--- a/python/sglang/srt/utils/profile_utils.py
+++ b/python/sglang/srt/utils/profile_utils.py
@@ -8,7 +8,6 @@ from typing import Callable, Dict, List, Optional
 
 import torch
 
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.environ import envs
 from sglang.srt.managers.io_struct import ProfileReqOutput
 from sglang.srt.model_executor.forward_batch_info import ForwardBatch, ForwardMode
@@ -71,14 +70,13 @@ def export_cuda_graph_capture_trace(prof_context, *, runner_name: str, tp_rank:
 
 
 class ProfileManager:
-    def __init__(self, ps: ParallelState, cpu_group):
+    def __init__(self, cpu_group):
         self.stage_based_trigger = _StageBasedTrigger(
             on_start=self._do_start,
             on_stop=self._do_stop,
         )
-        self.ps = ps
         self.cpu_group = cpu_group
-        self.first_rank_in_node = ps.gpu_id == get_device().base_gpu_id
+        self.first_rank_in_node = get_device().gpu_id == get_device().base_gpu_id
         self.profiler_kwargs = None
         self.profiler = None
         self.detailed_annotations = False
@@ -154,7 +152,6 @@ class ProfileManager:
         set_detailed_annotations_enabled(self.detailed_annotations)
         self.profiler = _ProfilerBase.create(
             **self.profiler_kwargs,
-            ps=self.ps,
             cpu_group=self.cpu_group,
             first_rank_in_node=self.first_rank_in_node,
             output_suffix=f"-{stage}" if stage else "",
@@ -303,7 +300,6 @@ class _ProfilerConcreteBase(_ProfilerBase):
         output_prefix: str,
         output_suffix: str,
         profile_id: str,
-        ps: ParallelState,
         cpu_group,
         first_rank_in_node: bool,
     ):
@@ -311,7 +307,6 @@ class _ProfilerConcreteBase(_ProfilerBase):
         self.output_prefix = output_prefix
         self.output_suffix = output_suffix
         self.profile_id = profile_id
-        self.ps = ps
         self.cpu_group = cpu_group
         self.first_rank_in_node = first_rank_in_node
 
diff --git a/python/sglang/srt/weight_cache/daemon.py b/python/sglang/srt/weight_cache/daemon.py
index 0e7ae74fc..c1bd2bf0d 100644
--- a/python/sglang/srt/weight_cache/daemon.py
+++ b/python/sglang/srt/weight_cache/daemon.py
@@ -274,15 +274,14 @@ class WeightCacheDaemon:
         from sglang.srt.model_loader.loader import get_model_loader
 
         server_args = self.server_args
-        # The launcher told this daemon where it sits, and it builds the same
-        # groups a scheduler does, so the same one number places it.
         publish(
             server_args,
             role="weight_cache_daemon",
             ranks=SpawnRanks(
                 world_rank=spawn_world_rank(
                     server_args, tp_rank=self.tp_rank, pp_rank=self.pp_rank
-                )
+                ),
+                gpu_id=self.gpu_id,
             ),
         )
 
diff --git a/python/sglang/srt/weight_cache/ipc_loader.py b/python/sglang/srt/weight_cache/ipc_loader.py
index 3ebbae067..b9ee9b6e0 100644
--- a/python/sglang/srt/weight_cache/ipc_loader.py
+++ b/python/sglang/srt/weight_cache/ipc_loader.py
@@ -503,17 +503,17 @@ class IpcModelLoader(BaseModelLoader):
             # Build engine's config fingerprint
             from sglang.srt.layers.dp_attention import get_moe_cp_size
 
-            ps = get_parallel()
-            tp_size = ps.tp_size
-            tp_rank = ps.tp_rank
+            parallel = get_parallel()
+            tp_size = parallel.tp_size
+            tp_rank = parallel.tp_rank
 
-            pp_size = ps.pp_size
-            pp_rank = ps.pp_rank
+            pp_size = parallel.pp_size
+            pp_rank = parallel.pp_rank
 
-            ep_size = ps.moe_ep_size
+            ep_size = parallel.moe_ep_size
             moe_dp_size = get_moe_cp_size()
-            moe_dp_rank = ps.moe_dp_rank
-            moe_ep_rank = ps.moe_ep_rank
+            moe_dp_rank = parallel.moe_dp_rank
+            moe_ep_rank = parallel.moe_ep_rank
 
             dp_size = get_parallel().dp_size
 
@@ -535,10 +535,10 @@ class IpcModelLoader(BaseModelLoader):
                 moe_dp_size=moe_dp_size,
                 moe_dp_rank=moe_dp_rank,
                 moe_ep_rank=moe_ep_rank,
-                enable_dp_attention=ps.enable_dp_attention,
-                enable_dp_lm_head=ps.enable_dp_lm_head,
-                attn_cp_size=ps.attn_cp_size,
-                moe_dense_tp_size=ps.moe_dense_tp_size,
+                enable_dp_attention=parallel.enable_dp_attention,
+                enable_dp_lm_head=parallel.enable_dp_lm_head,
+                attn_cp_size=parallel.attn_cp_size,
+                moe_dense_tp_size=parallel.moe_dense_tp_size,
                 moe_a2a_backend=get_exec().moe.moe_a2a_backend,
                 quant_method=quant_method,
                 quant_config_hash=hash_quant_config(quant_config),
diff --git a/python/sglang/test/kits/attention_unittest/attention_methods/dense_attention.py b/python/sglang/test/kits/attention_unittest/attention_methods/dense_attention.py
index d26824efd..8a2e1c6f6 100644
--- a/python/sglang/test/kits/attention_unittest/attention_methods/dense_attention.py
+++ b/python/sglang/test/kits/attention_unittest/attention_methods/dense_attention.py
@@ -7,7 +7,6 @@ import torch.nn.functional as F
 from torch import nn
 
 from sglang.srt.configs.model_config import AttentionArch
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.layers.attention.attention_registry import ATTENTION_BACKENDS
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.mem_cache.memory_pool import MHATokenToKVPool, ReqToTokenPool
@@ -339,7 +338,6 @@ class MockModelRunner(ModelRunner):
         self.tp_size = 1
         self.dp_size = 1
         self.pp_size = 1
-        self.ps = ParallelState.trivial()
         self.is_draft_worker = False
         self.max_running_requests = pool_batch_size
         # trtllm_mha __init__ scans model.modules() for ENCODER_ONLY layers;
diff --git a/python/sglang/test/kits/attention_unittest/attention_methods/dsa_attention.py b/python/sglang/test/kits/attention_unittest/attention_methods/dsa_attention.py
index 688c89e72..440e497e8 100644
--- a/python/sglang/test/kits/attention_unittest/attention_methods/dsa_attention.py
+++ b/python/sglang/test/kits/attention_unittest/attention_methods/dsa_attention.py
@@ -5,7 +5,6 @@ from typing import Any
 import torch
 from torch import nn
 
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.layers.attention.attention_registry import ATTENTION_BACKENDS
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.mem_cache.memory_pool import DSATokenToKVPool, ReqToTokenPool
@@ -322,7 +321,6 @@ class DSAMockModelRunner(ModelRunner):
         self._kernel_warmed_up = True
         self.dp_size = 1
         self.pp_size = 1
-        self.ps = ParallelState.trivial()
         self._server_args_override = get_context().override_server_args(
             attention_backend=case.backend,
             chunked_prefill_size=-1,
diff --git a/python/sglang/test/kits/attention_unittest/attention_methods/dsv4_attention.py b/python/sglang/test/kits/attention_unittest/attention_methods/dsv4_attention.py
index 065dd4d79..83b4161c9 100644
--- a/python/sglang/test/kits/attention_unittest/attention_methods/dsv4_attention.py
+++ b/python/sglang/test/kits/attention_unittest/attention_methods/dsv4_attention.py
@@ -22,7 +22,6 @@ from torch import nn
 from sglang.kernels.ops.attention.dsv4.quant_k_cache import (
     quant_to_nope_fp8_rope_bf16_pack_triton,
 )
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.environ import envs
 from sglang.srt.layers.attention.attention_registry import ATTENTION_BACKENDS
 from sglang.srt.layers.radix_attention import RadixAttention
@@ -349,7 +348,6 @@ class MockDSV4ModelRunner:
         self.tp_size = 1
         self.dp_size = 1
         self.pp_size = 1
-        self.ps = ParallelState.trivial()
         self._server_args_override = get_context().override_server_args(
             attention_backend=case.backend,
             chunked_prefill_size=-1,
diff --git a/python/sglang/test/kits/attention_unittest/attention_methods/gdn_attention.py b/python/sglang/test/kits/attention_unittest/attention_methods/gdn_attention.py
index fc34825e1..e7a3d4b61 100644
--- a/python/sglang/test/kits/attention_unittest/attention_methods/gdn_attention.py
+++ b/python/sglang/test/kits/attention_unittest/attention_methods/gdn_attention.py
@@ -10,7 +10,6 @@ from sglang.srt.configs.mamba_utils import (
     Mamba2StateShape,
 )
 from sglang.srt.configs.model_config import AttentionArch
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.layers.attention.attention_registry import ATTENTION_BACKENDS
 from sglang.srt.layers.attention.hybrid_linear_attn_backend import (
     HybridLinearAttnBackend,
@@ -228,7 +227,6 @@ class MockGDNModelRunner(ModelRunner):
         self.decode_attention_backend_str = case.backend
         self.draft_attention_backend = None
         self.gpu_id = 0
-        self.ps = ParallelState.trivial()
         self.spec_algorithm = SpeculativeAlgorithm.NONE
         self.canary_manager = None
         self.page_size = case.page_size
diff --git a/python/sglang/test/kits/attention_unittest/attention_methods/kda_attention.py b/python/sglang/test/kits/attention_unittest/attention_methods/kda_attention.py
index 75787c340..4254e7cd2 100644
--- a/python/sglang/test/kits/attention_unittest/attention_methods/kda_attention.py
+++ b/python/sglang/test/kits/attention_unittest/attention_methods/kda_attention.py
@@ -10,7 +10,6 @@ from sglang.srt.configs.mamba_utils import (
     Mamba2StateDType,
 )
 from sglang.srt.configs.model_config import AttentionArch
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.layers.attention.attention_registry import ATTENTION_BACKENDS
 from sglang.srt.layers.attention.hybrid_linear_attn_backend import (
     HybridLinearAttnBackend,
@@ -231,7 +230,6 @@ class MockKDAModelRunner(ModelRunner):
         self.decode_attention_backend_str = case.backend
         self.draft_attention_backend = None
         self.gpu_id = 0
-        self.ps = ParallelState.trivial()
         self.spec_algorithm = SpeculativeAlgorithm.NONE
         self.canary_manager = None
         self.page_size = case.page_size
diff --git a/python/sglang/test/kits/attention_unittest/attention_methods/lightning_attention.py b/python/sglang/test/kits/attention_unittest/attention_methods/lightning_attention.py
index b17b663c2..42c285f2d 100644
--- a/python/sglang/test/kits/attention_unittest/attention_methods/lightning_attention.py
+++ b/python/sglang/test/kits/attention_unittest/attention_methods/lightning_attention.py
@@ -10,7 +10,6 @@ from sglang.srt.configs.mamba_utils import (
     Mamba2StateShape,
 )
 from sglang.srt.configs.model_config import AttentionArch
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.layers.attention.attention_registry import ATTENTION_BACKENDS
 from sglang.srt.layers.attention.linear.lightning_backend import (
     LightningAttentionBackend,
@@ -239,7 +238,6 @@ class MockLightningModelRunner(ModelRunner):
         self.decode_attention_backend_str = case.backend
         self.draft_attention_backend = None
         self.gpu_id = 0
-        self.ps = ParallelState.trivial()
         self.spec_algorithm = SpeculativeAlgorithm.NONE
         self.canary_manager = None
         self.page_size = case.page_size
diff --git a/python/sglang/test/kits/attention_unittest/attention_methods/mamba2_attention.py b/python/sglang/test/kits/attention_unittest/attention_methods/mamba2_attention.py
index 56459d3ef..de378e9ad 100644
--- a/python/sglang/test/kits/attention_unittest/attention_methods/mamba2_attention.py
+++ b/python/sglang/test/kits/attention_unittest/attention_methods/mamba2_attention.py
@@ -26,7 +26,6 @@ from sglang.srt.configs.mamba_utils import (  # noqa: E402
     Mamba2StateShape,
 )
 from sglang.srt.configs.model_config import AttentionArch  # noqa: E402
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.layers.attention.attention_registry import (  # noqa: E402
     ATTENTION_BACKENDS,
 )
@@ -325,7 +324,6 @@ class MockMamba2ModelRunner(ModelRunner):
         self.decode_attention_backend_str = case.backend
         self.draft_attention_backend = None
         self.gpu_id = 0
-        self.ps = ParallelState.trivial()
         self.spec_algorithm = SpeculativeAlgorithm.NONE
         self.canary_manager = None
         self.page_size = case.page_size
diff --git a/python/sglang/test/kits/attention_unittest/attention_methods/mla_attention.py b/python/sglang/test/kits/attention_unittest/attention_methods/mla_attention.py
index e57eb6835..0a381ca0e 100644
--- a/python/sglang/test/kits/attention_unittest/attention_methods/mla_attention.py
+++ b/python/sglang/test/kits/attention_unittest/attention_methods/mla_attention.py
@@ -7,7 +7,6 @@ import torch.nn.functional as F
 from torch import nn
 
 from sglang.srt.configs.model_config import AttentionArch
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.layers.attention.attention_registry import ATTENTION_BACKENDS
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.mem_cache.memory_pool import MLATokenToKVPool, ReqToTokenPool
@@ -247,7 +246,6 @@ class MockMLAModelRunner(ModelRunner):
         self.tp_size = 1
         self.dp_size = 1
         self.pp_size = 1
-        self.ps = ParallelState.trivial()
         self.spec_algorithm = SpeculativeAlgorithm.NONE
         speculative_num_draft_tokens = (
             max(case.input_lens)
diff --git a/python/sglang/test/scripted_runtime/context/queries.py b/python/sglang/test/scripted_runtime/context/queries.py
index d26fcffa8..2ff128742 100644
--- a/python/sglang/test/scripted_runtime/context/queries.py
+++ b/python/sglang/test/scripted_runtime/context/queries.py
@@ -2,6 +2,8 @@ from __future__ import annotations
 
 from typing import TYPE_CHECKING, Dict, Iterator, List, Optional
 
+from sglang.srt.runtime_context import get_parallel
+
 if TYPE_CHECKING:
     from sglang.srt.managers.schedule_batch import Req
     from sglang.test.scripted_runtime.context.api import ScriptedContext
@@ -12,7 +14,7 @@ def _get_all_reqs(ctx: ScriptedContext) -> Iterator[Req]:
     if s.chunked_req is not None:
         yield s.chunked_req
     yield from s.waiting_queue
-    if s.ps.pp_size > 1:
+    if get_parallel().pp_size > 1:
         for mb in (*s.mbs, *s.last_mbs, *s.running_mbs):
             if mb is not None:
                 yield from mb.reqs
diff --git a/python/sglang/test/scripted_runtime/scheduler_hook.py b/python/sglang/test/scripted_runtime/scheduler_hook.py
index b2a4ca68b..177613317 100644
--- a/python/sglang/test/scripted_runtime/scheduler_hook.py
+++ b/python/sglang/test/scripted_runtime/scheduler_hook.py
@@ -13,6 +13,7 @@ import zmq
 from sglang.srt.arg_groups.overrides import resolving_view
 from sglang.srt.environ import envs
 from sglang.srt.managers.io_struct import sock_recv, sock_send, wrap_as_pickle
+from sglang.srt.runtime_context import get_parallel
 from sglang.srt.utils.network import get_zmq_socket
 from sglang.test.scripted_runtime.background_http_poster import BackgroundHttpPoster
 from sglang.test.scripted_runtime.context import ScriptedContext
@@ -125,9 +126,9 @@ class ScriptedSchedulerHook:
     ) -> None:
         self.scheduler = scheduler
         self._is_driver = (
-            scheduler.ps.pp_rank == 0
-            and scheduler.ps.tp_rank == 0
-            and scheduler.ps.attn_cp_rank == 0
+            get_parallel().pp_rank == 0
+            and get_parallel().tp_rank == 0
+            and get_parallel().attn_cp_rank == 0
         )
         self._batch_log: List[ScriptedBatchRecord] = []
 
diff --git a/test/manual/test_forward_split_prefill.py b/test/manual/test_forward_split_prefill.py
index 726ccfcb6..7ec1d3d31 100644
--- a/test/manual/test_forward_split_prefill.py
+++ b/test/manual/test_forward_split_prefill.py
@@ -15,7 +15,6 @@ import torch
 
 from sglang.benchmark.one_batch import TreeCacheNamespace
 from sglang.srt.configs.model_config import ModelConfig
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.managers.schedule_batch import Req, ScheduleBatch
 from sglang.srt.model_executor.forward_batch_info import ForwardBatch, ForwardMode
 from sglang.srt.model_executor.forward_context import (
@@ -65,7 +64,6 @@ class TestForwardSplitPrefill(CustomTestCase):
             model_config=cls.model_config,
             mem_fraction_static=cls.server_args.mem_fraction_static,
             gpu_id=0,
-            ps=ParallelState.trivial(tp_size=cls.tp_size),
             nccl_port=cls.port_args.nccl_port,
             server_args=cls.server_args,
         )
diff --git a/test/manual/test_vlm_accuracy.py b/test/manual/test_vlm_accuracy.py
index 3fe13bde0..0e084f442 100644
--- a/test/manual/test_vlm_accuracy.py
+++ b/test/manual/test_vlm_accuracy.py
@@ -9,7 +9,6 @@ import torch.nn.functional as F
 from transformers import AutoModel, AutoProcessor, AutoTokenizer
 
 from sglang.srt.configs.model_config import ModelConfig
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.entrypoints.openai.protocol import ChatCompletionRequest
 from sglang.srt.managers.mm_utils import embed_mm_inputs, init_mm_embedding_cache
 from sglang.srt.managers.schedule_batch import (
@@ -151,7 +150,6 @@ class VisionLLMLogitsBase(unittest.IsolatedAsyncioTestCase):
             model_config=ModelConfig(self.model_path, model_override_args="{}"),
             mem_fraction_static=0.8,
             gpu_id=0,
-            ps=ParallelState.trivial(),
             nccl_port=12435,
             server_args=server_args,
         )
diff --git a/test/registered/unit/disaggregation/test_decode_queue_cleanup.py b/test/registered/unit/disaggregation/test_decode_queue_cleanup.py
index 94760fc6b..ff0c001fd 100644
--- a/test/registered/unit/disaggregation/test_decode_queue_cleanup.py
+++ b/test/registered/unit/disaggregation/test_decode_queue_cleanup.py
@@ -11,7 +11,6 @@ from sglang.srt.disaggregation.decode import (
 )
 from sglang.srt.disaggregation.fake.conn import FakeKVManager, FakeKVReceiver
 from sglang.srt.disaggregation.utils import DisaggregationMode
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.managers.schedule_batch import FINISH_ABORT
 from sglang.srt.managers.scheduler import Scheduler
 from sglang.srt.runtime_context import get_context, publish, reset_context
@@ -440,7 +439,6 @@ class TestDecodeQueueCleanup(CustomTestCase):
         scheduler.last_batch = None
         scheduler.cur_batch_for_debug = None
         scheduler.enable_overlap = False
-        scheduler.ps = ParallelState.trivial()
         scheduler.running_mbs = []
         scheduler.waiting_queue = []
         scheduler.grammar_manager = SimpleNamespace(grammar_queue=[])
diff --git a/test/registered/unit/disaggregation/test_pd_role_switch.py b/test/registered/unit/disaggregation/test_pd_role_switch.py
index 617ee3d2d..f3fd17ea0 100644
--- a/test/registered/unit/disaggregation/test_pd_role_switch.py
+++ b/test/registered/unit/disaggregation/test_pd_role_switch.py
@@ -131,7 +131,6 @@ class TestHandlePdRoleSwitch(unittest.TestCase):
     def test_rejected_when_decode_graph_headroom_is_insufficient(self):
         s = self._scheduler(DisaggregationMode.PREFILL)
         s.device = "cuda"
-        s.ps = SimpleNamespace(gpu_id=0)
         s.tp_worker.get_decode_cuda_graph_bs.return_value = []
         with patch.object(role_switch, "get_available_gpu_memory", return_value=0.5):
             out = Scheduler.handle_pd_role_switch(
@@ -151,7 +150,6 @@ class TestHandlePdRoleSwitch(unittest.TestCase):
     def test_decode_graph_headroom_allows_flip(self):
         s = self._scheduler(DisaggregationMode.PREFILL)
         s.device = "cuda"
-        s.ps = SimpleNamespace(gpu_id=0)
         s.tp_worker.get_decode_cuda_graph_bs.return_value = []
         with patch.object(role_switch, "get_available_gpu_memory", return_value=1.0):
             out = Scheduler.handle_pd_role_switch(
diff --git a/test/registered/unit/entrypoints/test_rust_server_dp_ports.py b/test/registered/unit/entrypoints/test_rust_server_dp_ports.py
index 1740b0aec..92f0ab590 100644
--- a/test/registered/unit/entrypoints/test_rust_server_dp_ports.py
+++ b/test/registered/unit/entrypoints/test_rust_server_dp_ports.py
@@ -43,18 +43,18 @@ def test_dp_leaders_reuse_node_local_ports(
         for dp_rank, tp_rank in enumerate(ranks):
             scheduler = SimpleNamespace(
                 server_args=SimpleNamespace(),
-                ps=SimpleNamespace(
-                    tp_rank=tp_rank,
-                    tp_size=parallel.tp_size,
-                    pp_size=parallel.pp_size,
-                    attn_tp_size=parallel.attn_tp_size,
-                    attn_cp_size=parallel.attn_cp_size,
-                    attn_dp_rank=dp_rank,
-                    dp_size=dp_size,
-                ),
                 model_config=SimpleNamespace(is_multimodal=False),
             )
-            ports.append(rust_server.RustServer.launch(scheduler).http_port)
+            # Where this rank sits, stated whole: the attention rank follows
+            # from the TP rank and the attention-TP width, and the identities
+            # refuse the combination if it describes no real layout.
+            with parallel.override(
+                tp_rank=tp_rank,
+                attn_dp_rank=dp_rank,
+                attn_tp_rank=tp_rank % parallel.attn_tp_size,
+                attn_cp_rank=0,
+            ):
+                ports.append(rust_server.RustServer.launch(scheduler).http_port)
 
         calls = extension.return_value.Server.call_args_list
         assert [c.kwargs["port_offset"] for c in calls] == expected
diff --git a/test/registered/unit/hardware_backend/mlx/test_attn_dp_request_capacity.py b/test/registered/unit/hardware_backend/mlx/test_attn_dp_request_capacity.py
index bd3c216ed..20e83a183 100644
--- a/test/registered/unit/hardware_backend/mlx/test_attn_dp_request_capacity.py
+++ b/test/registered/unit/hardware_backend/mlx/test_attn_dp_request_capacity.py
@@ -23,7 +23,6 @@ _HAS_MLX = importlib.util.find_spec("mlx") is not None
 _SKIP_REASON = "requires mlx"
 
 if _HAS_MLX:
-    from sglang.srt.distributed.parallel_state_wrapper import ParallelState
     from sglang.srt.hardware_backend.mlx.model_runner_stub import (
         MLX_AUX_STATE_SIZE_MAX_RUNNING_REQUESTS_RATIO as RATIO,
     )
@@ -62,7 +61,7 @@ def _stub_for_initialize(
     stub = MlxModelRunnerStub.__new__(MlxModelRunnerStub)
     stub._mlx_pool_size = pool_size
     stub.device = "cpu"
-    stub.ps = ParallelState.trivial(dp_size=dp_size, attn_dp_size=attn_dp_size)
+    stub.attn_dp_size = attn_dp_size
     stub.server_args = server_args
     stub.model_config = SimpleNamespace(
         is_hybrid_swa=False,
diff --git a/test/registered/unit/hardware_backend/mlx/test_metal_profiler.py b/test/registered/unit/hardware_backend/mlx/test_metal_profiler.py
index b9feaec83..e21b7a64e 100644
--- a/test/registered/unit/hardware_backend/mlx/test_metal_profiler.py
+++ b/test/registered/unit/hardware_backend/mlx/test_metal_profiler.py
@@ -208,14 +208,7 @@ class TestSchedulerProfilerManagerMPS(unittest.TestCase):
             SchedulerProfilerManager,
         )
 
-        class FakePS:
-            tp_rank = dp_rank = pp_rank = moe_ep_rank = 0
-            dp_size = pp_size = moe_ep_size = 1
-            gpu_id = 0
-
-        mgr = SchedulerProfilerManager(
-            ps=FakePS(), dp_tp_cpu_group=None, get_forward_ct=lambda: 0
-        )
+        mgr = SchedulerProfilerManager(dp_tp_cpu_group=None, get_forward_ct=lambda: 0)
         mgr._init_profile(output_dir, None, None, None, None, None, False, "test")
         return mgr
 
diff --git a/test/registered/unit/layers/test_mamba_prefill_track_metadata.py b/test/registered/unit/layers/test_mamba_prefill_track_metadata.py
index dee5d7d51..397db2428 100644
--- a/test/registered/unit/layers/test_mamba_prefill_track_metadata.py
+++ b/test/registered/unit/layers/test_mamba_prefill_track_metadata.py
@@ -228,7 +228,7 @@ class TestMambaPrefillTrackMetadata(unittest.TestCase):
             prefill_attention_backend_str="torch_native",
             ngram_embedding_manager=SimpleNamespace(enabled=False),
             lora_manager=None,
-            ps=SimpleNamespace(attn_dcp_size=1),
+            attn_dcp_size=1,
             attn_backend=SimpleNamespace(
                 get_cpu_graph_seq_len_fill_value=lambda: 1,
                 get_cuda_graph_seq_len_fill_value=lambda: 1,
diff --git a/test/registered/unit/managers/test_disagg_idle_step_counters.py b/test/registered/unit/managers/test_disagg_idle_step_counters.py
index 8764e4f97..8352498a1 100644
--- a/test/registered/unit/managers/test_disagg_idle_step_counters.py
+++ b/test/registered/unit/managers/test_disagg_idle_step_counters.py
@@ -20,7 +20,11 @@ from sglang.srt.model_executor.forward_batch_info import ForwardMode
 from sglang.srt.runtime_context import get_parallel
 from sglang.srt.speculative.spec_info import SpeculativeAlgorithm
 from sglang.test.ci.ci_register import register_cpu_ci
-from sglang.test.test_utils import CustomTestCase
+from sglang.test.test_utils import (
+    CustomTestCase,
+    enter_scope,
+    published_topology,
+)
 
 register_cpu_ci(est_time=1, suite="base-a-test-cpu")
 
@@ -58,6 +62,12 @@ def load_mlx_scheduler_module():
 
 
 class TestSchedulerIdleStepCounters(CustomTestCase):
+    def setUp(self):
+        super().setUp()
+        # The loop asks the context where this process sits; nothing here
+        # builds a process group, so the placement arrives by publishing one.
+        enter_scope(self, published_topology(role="scheduler"))
+
     @parameterized.expand(
         [
             (
@@ -406,7 +416,6 @@ class TestSchedulerIdleStepCounters(CustomTestCase):
         scheduler.forward_ct = 0
         scheduler.processed_tokens_counter = 0
         scheduler.spec_algorithm = SpeculativeAlgorithm.NONE
-        scheduler.ps = SimpleNamespace(pp_rank=0, attn_tp_rank=0, attn_cp_rank=0)
         scheduler._poll_timeout_aborts = Mock(return_value=[])
         scheduler.scheduler_stage_metrics = None
         scheduler.metrics_reporter = SimpleNamespace(record_scheduler_active=Mock())
@@ -455,7 +464,7 @@ class TestSchedulerIdleStepCounters(CustomTestCase):
         return scheduler
 
     def prepare_pp_scheduler(self, scheduler):
-        scheduler.ps.pp_size = 2
+        enter_scope(self, get_parallel().override(pp_size=2, pp_rank=0))
         scheduler.pp_group = SimpleNamespace(is_last_rank=True)
         scheduler.forward_stream_ctx = nullcontext()
         scheduler.forward_stream = Mock()
diff --git a/test/registered/unit/managers/test_output_streamer_customized_info.py b/test/registered/unit/managers/test_output_streamer_customized_info.py
index 3f4094e86..6614b9d71 100644
--- a/test/registered/unit/managers/test_output_streamer_customized_info.py
+++ b/test/registered/unit/managers/test_output_streamer_customized_info.py
@@ -148,7 +148,6 @@ class TestOutputStreamerCustomizedInfo(unittest.TestCase):
         streamer = Streamer(
             send_to_detokenizer=SimpleNamespace(send_output=outputs.append),
             tree_cache=None,
-            ps=SimpleNamespace(dp_rank=0, attn_tp_rank=0),
             server_args=SimpleNamespace(
                 stream_interval=1,
                 enable_request_time_stats_logging=False,
@@ -181,7 +180,6 @@ class TestOutputStreamerCustomizedInfo(unittest.TestCase):
         streamer = Streamer(
             send_to_detokenizer=SimpleNamespace(send_output=outputs.append),
             tree_cache=None,
-            ps=SimpleNamespace(dp_rank=0, attn_tp_rank=0),
             server_args=SimpleNamespace(
                 stream_interval=1,
                 enable_request_time_stats_logging=False,
@@ -218,7 +216,6 @@ class TestOutputStreamerCustomizedInfo(unittest.TestCase):
         streamer = Streamer(
             send_to_detokenizer=SimpleNamespace(send_output=outputs.append),
             tree_cache=None,
-            ps=SimpleNamespace(dp_rank=0, attn_tp_rank=0),
             server_args=SimpleNamespace(
                 stream_interval=1,
                 enable_request_time_stats_logging=False,
@@ -258,7 +255,6 @@ class TestOutputStreamerCustomizedInfo(unittest.TestCase):
         streamer = Streamer(
             send_to_detokenizer=SimpleNamespace(send_output=outputs.append),
             tree_cache=None,
-            ps=SimpleNamespace(dp_rank=0, attn_tp_rank=0),
             server_args=SimpleNamespace(
                 stream_interval=1,
                 enable_request_time_stats_logging=False,
@@ -286,7 +282,6 @@ class TestOutputStreamerCustomizedInfo(unittest.TestCase):
         streamer = Streamer(
             send_to_detokenizer=SimpleNamespace(send_output=outputs.append),
             tree_cache=None,
-            ps=SimpleNamespace(dp_rank=0, attn_tp_rank=0),
             server_args=SimpleNamespace(),
             is_generation=True,
             spec_algorithm=SpeculativeAlgorithm.NONE,
@@ -312,7 +307,6 @@ class TestOutputStreamerCustomizedInfo(unittest.TestCase):
         streamer = Streamer(
             send_to_detokenizer=SimpleNamespace(send_output=outputs.append),
             tree_cache=None,
-            ps=SimpleNamespace(dp_rank=0, attn_tp_rank=0),
             server_args=SimpleNamespace(),
             is_generation=True,
             spec_algorithm=SpeculativeAlgorithm.NONE,
@@ -334,7 +328,6 @@ class TestOutputStreamerCustomizedInfo(unittest.TestCase):
             Streamer(
                 send_to_detokenizer=SimpleNamespace(),
                 tree_cache=None,
-                ps=SimpleNamespace(),
                 server_args=SimpleNamespace(),
                 is_generation=True,
                 spec_algorithm=SpeculativeAlgorithm.NONE,
diff --git a/test/registered/unit/model_executor/test_pool_configurator.py b/test/registered/unit/model_executor/test_pool_configurator.py
index 5f6f8fd67..a6ff40f26 100644
--- a/test/registered/unit/model_executor/test_pool_configurator.py
+++ b/test/registered/unit/model_executor/test_pool_configurator.py
@@ -11,7 +11,6 @@ from types import SimpleNamespace
 from unittest.mock import MagicMock, patch
 
 from sglang.srt.configs.model_config import AttentionArch
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.runtime_context import (
     get_memory,
     get_parallel,
@@ -36,10 +35,17 @@ def mock_cpu_env(kv_size=2, tp_size=1, swa_eviction_interval=4):
 
     with (
         patch("torch._utils._element_size", return_value=kv_size),
-        # A width is a whole topology: state the TP siblings the identities
-        # relate it to, not the attention share alone.
+        # The whole attention triple, not just one leaf: a width that does not
+        # factor describes no layout.
         get_parallel().override(
-            tp_size=tp_size, attn_tp_size=tp_size, moe_tp_size=tp_size
+            tp_size=tp_size,
+            attn_tp_size=tp_size,
+            attn_dp_size=1,
+            attn_cp_size=1,
+            moe_ep_size=1,
+            moe_ep_group=None,
+            moe_dp_size=1,
+            moe_tp_size=tp_size,
         ),
         envs.SGLANG_SWA_EVICTION_INTERVAL.override(swa_eviction_interval),
     ):
@@ -174,7 +180,8 @@ def _make_model_runner(
     mr.layer_info = SimpleNamespace(
         start_layer=0, end_layer=num_layers, num_effective_layers=num_layers
     )
-    mr.ps = ParallelState.trivial()
+    mr.attn_dp_size = 1
+    mr.pp_size = 1
     mr.pp_group = SimpleNamespace(rank_in_group=0)
     mr.spec_aux_config = SimpleNamespace(
         eagle_draft_num_layers=None,
@@ -1271,7 +1278,8 @@ class TestSWAPoolFloor(CustomTestCase):
             kv_cache_dtype_str="fp8_e4m3",
             model_config=cfg,
             layer_info=SimpleNamespace(start_layer=0, end_layer=40),
-            ps=SimpleNamespace(pp_size=1, attn_dp_size=1),
+            pp_size=1,
+            attn_dp_size=1,
             sliding_window_size=128,
             page_size=256,
             spec_algorithm=spec,
diff --git a/test/registered/unit/multimodal/rust/shared/test_rust_server_extension.py b/test/registered/unit/multimodal/rust/shared/test_rust_server_extension.py
index 7629e7239..42bb14029 100644
--- a/test/registered/unit/multimodal/rust/shared/test_rust_server_extension.py
+++ b/test/registered/unit/multimodal/rust/shared/test_rust_server_extension.py
@@ -29,14 +29,6 @@ class TestRustServerExtension(CustomTestCase):
                 self.server.start_mm_workers(sentinel.spec, 8)
 
         scheduler = SimpleNamespace(
-            ps=SimpleNamespace(
-                dp_size=2,
-                attn_dp_rank=1,
-                tp_size=2,
-                tp_rank=1,
-                attn_tp_size=1,
-                attn_cp_size=1,
-            ),
             model_config=SimpleNamespace(is_multimodal=True),
         )
         with (
@@ -50,7 +42,16 @@ class TestRustServerExtension(CustomTestCase):
             patch.object(
                 server_module,
                 "get_parallel",
-                return_value=SimpleNamespace(nnodes=1, pp_size=1),
+                return_value=SimpleNamespace(
+                    nnodes=1,
+                    pp_size=1,
+                    dp_size=2,
+                    attn_dp_rank=1,
+                    tp_size=2,
+                    tp_rank=1,
+                    attn_tp_size=1,
+                    attn_cp_size=1,
+                ),
             ),
             patch.object(ModelServer, "_partition_cores", return_value=(None, None)),
             patch.object(
diff --git a/test/registered/unit/observability/test_forward_pass_metrics.py b/test/registered/unit/observability/test_forward_pass_metrics.py
index a19925d93..1442b4848 100644
--- a/test/registered/unit/observability/test_forward_pass_metrics.py
+++ b/test/registered/unit/observability/test_forward_pass_metrics.py
@@ -9,7 +9,6 @@ import unittest
 from unittest.mock import patch
 
 from sglang.srt.disaggregation.utils import DisaggregationMode
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.managers.scheduler_components.metrics_reporter import (
     PrefillStats,
     SchedulerMetricsReporter,
@@ -18,16 +17,6 @@ from sglang.srt.managers.scheduler_components.metrics_reporter import (
 from sglang.test.test_utils import CustomTestCase, enter_scope
 
 
-def _make_ps(**overrides) -> ParallelState:
-    """Build a ParallelState with reasonable defaults for tests; override fields via kwargs."""
-    defaults = dict(
-        dp_rank=None,
-        moe_dp_rank=None,
-    )
-    defaults.update(overrides)
-    return ParallelState.trivial(**defaults)
-
-
 class _FakeReq:
     def __init__(
         self,
@@ -75,11 +64,30 @@ class _DummyPublisherThread:
 
 
 def _publish_server_args(test, **fields):
-    """Publish a config for the reporter under test and return the instance."""
+    """Publish a config for the reporter under test and return the instance.
+
+    The collector asks the context where this process sits, so the ranks are
+    stated too: without them a rank read falls through to a process group that
+    a unit test has not built.
+    """
     fields.setdefault("decode_log_interval", 40)
     override = get_context().override_server_args(**fields)
     server_args = override.install()
     test.addCleanup(override.restore)
+    enter_scope(
+        test,
+        get_parallel().override(
+            tp_rank=0,
+            attn_tp_rank=0,
+            attn_cp_rank=0,
+            moe_ep_rank=0,
+            attn_dp_rank=0,
+            dp_rank=0,
+            moe_ep_size=1,
+            moe_dp_size=1,
+            moe_tp_size=1,
+        ),
+    )
     return server_args
 
 
@@ -93,8 +101,6 @@ def _make_reporter(test, scheduler) -> SchedulerMetricsReporter:
             enable_mfu_metrics=False,
             enable_forward_pass_metrics=False,
         )
-    if not hasattr(scheduler, "ps"):
-        scheduler.ps = ParallelState.trivial()
     if not hasattr(scheduler, "kv_events_publisher"):
         scheduler.kv_events_publisher = types.SimpleNamespace(
             init_kv_events=lambda *a, **kw: None,
@@ -291,9 +297,9 @@ class TestForwardPassMetrics(unittest.TestCase):
             forward_pass_metrics_ipc_name=None,
             kv_events_config=None,
         )
-        scheduler.ps = _make_ps(attn_tp_rank=0, dp_rank=2, pp_rank=0, pp_size=1)
-        # The reporter asks the context whether this is the last stage.
-        enter_scope(self, get_parallel().override(pp_rank=0, pp_size=1))
+        # The reporter asks the context whether this is the last stage, and
+        # which replica it is reporting for.
+        enter_scope(self, get_parallel().override(pp_rank=0, pp_size=1, dp_rank=2))
         scheduler.enable_kv_cache_events = False
 
         with patch(
@@ -330,7 +336,6 @@ class TestForwardPassMetrics(unittest.TestCase):
             forward_pass_metrics_ipc_name=None,
             kv_events_config=None,
         )
-        scheduler.ps = _make_ps(attn_tp_rank=0, dp_rank=0, pp_rank=0, pp_size=2)
         # The reporter asks the context whether this is the last stage.
         enter_scope(self, get_parallel().override(pp_rank=0, pp_size=2))
         scheduler.enable_kv_cache_events = False
diff --git a/test/registered/unit/spec/test_draft_per_runner_config.py b/test/registered/unit/spec/test_draft_per_runner_config.py
index 1936b84b6..c18923617 100644
--- a/test/registered/unit/spec/test_draft_per_runner_config.py
+++ b/test/registered/unit/spec/test_draft_per_runner_config.py
@@ -175,7 +175,6 @@ class TestDraftPerRunnerConfig(CustomTestCase):
         scheduler.tp_worker = SimpleNamespace(
             model_runner=SimpleNamespace(model_config=SimpleNamespace(context_len=4096))
         )
-        scheduler.ps = SimpleNamespace(gpu_id=0)
         scheduler.nccl_port = 0
         scheduler.spec_algorithm = SimpleNamespace(
             is_none=lambda: False,
diff --git a/test/registered/unit/spec/test_dspark_target_hidden_projection.py b/test/registered/unit/spec/test_dspark_target_hidden_projection.py
index ddb55aee4..2f85aa8f0 100644
--- a/test/registered/unit/spec/test_dspark_target_hidden_projection.py
+++ b/test/registered/unit/spec/test_dspark_target_hidden_projection.py
@@ -6,6 +6,7 @@ import torch
 
 from sglang.srt.layers.aux_hidden_states import pack_aux_hidden_states
 from sglang.srt.models.dspark import DSparkDraftMixin
+from sglang.srt.runtime_context import get_parallel
 from sglang.srt.speculative.dspark_components.dspark_kv_inject import (
     TargetHiddenKvInjector,
 )
@@ -48,16 +49,13 @@ class DSparkTargetHiddenProjectionTest(CustomTestCase):
             ),
         )
         with (
-            mock.patch(
-                "sglang.srt.speculative.dspark_components.dspark_worker_v2.get_pp_group",
-                return_value=SimpleNamespace(is_last_rank=False),
-            ),
+            get_parallel().override(pp_group=SimpleNamespace(is_last_rank=False)),
             mock.patch(
                 "sglang.srt.speculative.dspark_components.dspark_worker_v2.get_schedule",
                 return_value=SimpleNamespace(page_size=1),
             ),
         ):
-            worker = DSparkWorkerV2(None, 0, None, 0, target)
+            worker = DSparkWorkerV2(None, 0, 0, target)
         worker.alloc_memory_pool()
         worker.init_attention_backends()
         worker.init_cuda_graphs()
diff --git a/test/registered/unit/test_runtime_context.py b/test/registered/unit/test_runtime_context.py
index fd022d5a5..5c1f8f081 100644
--- a/test/registered/unit/test_runtime_context.py
+++ b/test/registered/unit/test_runtime_context.py
@@ -46,6 +46,7 @@ from sglang.srt.runtime_context import (
     assert_published,
     derive_parallel_widths,
     get_context,
+    get_device,
     get_exec,
     get_flags,
     get_parallel,
@@ -366,6 +367,35 @@ class TestSpawnIdentities(_IsolatedOverrides):
         self.assertEqual(parallel.pp_rank, 1)
         self.assertEqual(parallel.dp_rank, 2)
 
+    def test_the_spawn_states_the_device_and_the_record_stays_clean(self):
+        """The parent picks the device, so it arrives with the rest of the
+        placement. It is stamped onto the bag: the record is the startup
+        input and stays as the caller handed it over."""
+        server_args = ServerArgs(model_path="dummy")
+        publish(
+            server_args,
+            role="test",
+            ranks=SpawnRanks(world_rank=0, gpu_id=3),
+        )
+        self.assertEqual(get_device().gpu_id, 3)
+        # Not on the record at all. An `Arg` is the operator's input and is
+        # collected into `ServerArgs`; nobody types this one, so it is
+        # declared rather than carried, and the startup input has no field
+        # for the spawn to have to leave alone.
+        self.assertNotIn(
+            "gpu_id", {f.name for f in msgspec.structs.fields(type(server_args))}
+        )
+
+    def test_a_process_on_no_device_is_told_nothing(self):
+        """Most roles run on no device at all, so the bundle leaves it out and
+        the bag keeps the declared default rather than inventing a zero."""
+        publish(
+            ServerArgs(model_path="dummy"),
+            role="test",
+            ranks=SpawnRanks(world_rank=0),
+        )
+        self.assertIsNone(get_device().gpu_id)
+
     def test_no_controller_is_an_answer_not_a_failure(self):
         """`dp_rank=None` means "not under a data parallel controller", which
         is a fact about the deployment, unlike never having been told. The
@@ -394,7 +424,7 @@ class TestSpawnIdentities(_IsolatedOverrides):
 class TestAttentionRanksComeFromPublish(_IsolatedOverrides):
     """With a spawn bundle, a rank read works before any group exists.
 
-    This is what `ParallelState` provided by being a plain frozen record, and
+    This is what the per-runner record provided by being a plain frozen object, and
     what the topology init could not: it needs the groups. Deriving at publish
     is what lets a reader ask the context in a process that never initialises
     distributed -- every unit test that builds a scheduler component, for one.
@@ -3068,6 +3098,58 @@ class TestWhoAnswersDuringADraftScope(CustomTestCase):
         self.assertEqual((info.pp_rank, info.pp_size), (0, 1))
 
 
+class TestTheRecordIsNeverWrittenTo(CustomTestCase):
+    """`server_args` is the startup record; the bags are the truth afterwards.
+
+    Writing a field onto it after `resolve_once()` has sealed it puts a second
+    answer where there is supposed to be one, and it is invisible to anything
+    reading the bag. The sanctioned writer is `RuntimeContext.override`, which
+    writes the bag and says so in its own contract. `arg_groups/` is exempt: it
+    is the resolution pipeline, so building the record is its job.
+    """
+
+    #: Assignments here are the record being built, not mutated behind a reader.
+    EXEMPT = ("srt/arg_groups/",)
+
+    def test_nothing_assigns_a_field_of_the_record(self):
+        import ast as _ast
+
+        from sglang.srt.arg_groups.arg_utils import namespace_of
+        from sglang.srt.server_args import ServerArgs
+
+        fields = set(namespace_of(ServerArgs))
+        offenders = []
+        for path in _sources():
+            rel = path.as_posix()
+            if "sglang/srt/" not in rel and "sglang/benchmark/" not in rel:
+                continue
+            if any(part in rel for part in self.EXEMPT):
+                continue
+            for node in _ast.walk(_ast.parse(path.read_text(encoding="utf-8-sig"))):
+                targets = (
+                    node.targets
+                    if isinstance(node, _ast.Assign)
+                    else [node.target]
+                    if isinstance(node, (_ast.AugAssign, _ast.AnnAssign))
+                    else []
+                )
+                for target in targets:
+                    if not isinstance(target, _ast.Attribute):
+                        continue
+                    base = target.value
+                    name = getattr(base, "id", getattr(base, "attr", None))
+                    if target.attr.startswith("_"):
+                        continue
+                    if name == "server_args" and target.attr in fields:
+                        offenders.append(f"{rel}:{target.lineno} .{target.attr}")
+        self.assertEqual(
+            offenders,
+            [],
+            "write the bag through get_context().override(source, ...) instead "
+            "-- the record is not a channel:\n  " + "\n  ".join(offenders),
+        )
+
+
 class TestNothingReadsThePlacementBeforeItIsFrozen(CustomTestCase):
     """`ModelRunner.__init__` freezes its placement partway through.
 
diff --git a/test/registered/unit/utils/test_weight_checker.py b/test/registered/unit/utils/test_weight_checker.py
index 5db02aff7..94753320d 100644
--- a/test/registered/unit/utils/test_weight_checker.py
+++ b/test/registered/unit/utils/test_weight_checker.py
@@ -20,7 +20,6 @@ from unittest.mock import patch
 import torch
 from torch import nn
 
-from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.layers.quantization.fp8_utils import (
     quant_weight_ue8m0,
     transform_scale_ue8m0,
@@ -181,15 +180,6 @@ class _FakeModelRunner:
         attn_dp_size: int | None = None,
     ):
         self.model = model
-        self.ps = ParallelState.trivial(
-            tp_rank=tp_rank,
-            tp_size=tp_size,
-            dp_rank=dp_rank,
-            dp_size=dp_size,
-            attn_dp_size=attn_dp_size if attn_dp_size is not None else dp_size,
-            pp_rank=pp_rank,
-            pp_size=pp_size,
-        )
 
 
 # ---------------------------------------------------------------------------