diff --git a/python/sglang/srt/disaggregation/encode_server.py b/python/sglang/srt/disaggregation/encode_server.py
index 5a14c804c..f92639a11 100644
--- a/python/sglang/srt/disaggregation/encode_server.py
+++ b/python/sglang/srt/disaggregation/encode_server.py
@@ -14,7 +14,7 @@ import traceback
 import uuid
 from collections import defaultdict
 from http import HTTPStatus
-from typing import Dict, List, Optional, Set, Tuple, Union
+from typing import Annotated, Dict, List, Optional, Set, Tuple, Union
 
 import aiohttp
 import numpy as np
@@ -23,7 +23,7 @@ import torch
 import uvicorn
 import zmq
 import zmq.asyncio
-from fastapi import FastAPI
+from fastapi import Body, FastAPI
 from fastapi.responses import ORJSONResponse, Response
 from transformers import AutoProcessor
 
@@ -3856,7 +3856,7 @@ async def health_generate():
 
 
 @app.api_route("/start_profile", methods=["GET", "POST"])
-async def start_profile_async(obj: Optional[ProfileReq] = None):
+async def start_profile_async(obj: Annotated[Optional[ProfileReq], Body()] = None):
     if dp_dispatcher is not None:
         if obj is not None:
             obj.req_type = ProfileReqType.START_PROFILE
diff --git a/python/sglang/srt/entrypoints/http_server.py b/python/sglang/srt/entrypoints/http_server.py
index 8b5d9e73d..4d8581afc 100644
--- a/python/sglang/srt/entrypoints/http_server.py
+++ b/python/sglang/srt/entrypoints/http_server.py
@@ -28,6 +28,7 @@ import uuid
 from contextlib import asynccontextmanager
 from http import HTTPStatus
 from typing import (
+    Annotated,
     Any,
     AsyncGenerator,
     AsyncIterator,
@@ -43,6 +44,7 @@ import requests
 import uvicorn
 import uvloop
 from fastapi import (
+    Body,
     Depends,
     FastAPI,
     File,
@@ -739,7 +741,9 @@ async def get_load():
 # curl -s -X POST http://localhost:30000/set_internal_state -H "Content-Type: application/json" -d '{"server_args": {"pp_max_micro_batch_size": 8}}'
 @app.api_route("/set_internal_state", methods=["POST", "PUT"])
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def set_internal_state(obj: SetInternalStateReq, request: Request):
+async def set_internal_state(
+    obj: Annotated[SetInternalStateReq, Body()], request: Request
+):
     res = await _global_state.tokenizer_manager.set_internal_state(obj)
     return res
 
@@ -950,7 +954,9 @@ async def clear_hicache_storage_backend():
 #   }'
 @app.api_route("/hicache/storage-backend", methods=["PUT"])
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def attach_hicache_storage_backend(obj: AttachHiCacheStorageReqInput):
+async def attach_hicache_storage_backend(
+    obj: Annotated[AttachHiCacheStorageReqInput, Body()],
+):
     """Attach (enable) HiCache storage backend at runtime.
 
     Only allowed when there are NO running / queued requests.
@@ -964,7 +970,7 @@ async def attach_hicache_storage_backend(obj: AttachHiCacheStorageReqInput):
         hicache_storage_prefetch_policy=obj.hicache_storage_prefetch_policy,
         hicache_write_policy=obj.hicache_write_policy,
     )
-    msg = getattr(ret, "message", "")
+    msg = ret.message
     return Response(
         content=(
             (
@@ -991,7 +997,7 @@ async def detach_hicache_storage_backend():
         return _admin_api_key_missing_response()
 
     ret = await _global_state.tokenizer_manager.detach_hicache_storage()
-    msg = getattr(ret, "message", "")
+    msg = ret.message
     return Response(
         content=(
             (
@@ -1024,7 +1030,7 @@ async def hicache_storage_backend_status():
 
 @app.api_route("/start_profile", methods=["GET", "POST"])
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def start_profile_async(obj: Optional[ProfileReq] = None):
+async def start_profile_async(obj: Annotated[Optional[ProfileReq], Body()] = None):
     """Start profiling."""
     await _global_state.tokenizer_manager.start_profile(obj or ProfileReq())
     return Response(
@@ -1102,7 +1108,9 @@ async def dump_expert_distribution_record_async():
 
 @app.post("/update_weights_from_disk")
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def update_weights_from_disk(obj: UpdateWeightFromDiskReqInput, request: Request):
+async def update_weights_from_disk(
+    obj: Annotated[UpdateWeightFromDiskReqInput, Body()], request: Request
+):
     """Update the weights from disk inplace without re-launching the server."""
     (
         success,
@@ -1130,7 +1138,8 @@ async def update_weights_from_disk(obj: UpdateWeightFromDiskReqInput, request: R
 @app.post("/init_weights_send_group_for_remote_instance")
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
 async def init_weights_send_group_for_remote_instance(
-    obj: InitWeightsSendGroupForRemoteInstanceReqInput, request: Request
+    obj: Annotated[InitWeightsSendGroupForRemoteInstanceReqInput, Body()],
+    request: Request,
 ):
     (
         success,
@@ -1148,7 +1157,7 @@ async def init_weights_send_group_for_remote_instance(
 @app.post("/send_weights_to_remote_instance")
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
 async def send_weights_to_remote_instance(
-    obj: SendWeightsToRemoteInstanceReqInput, request: Request
+    obj: Annotated[SendWeightsToRemoteInstanceReqInput, Body()], request: Request
 ):
     (
         success,
@@ -1204,7 +1213,7 @@ async def remote_instance_transfer_engine_info(rank: int = None):
 @app.post("/init_weights_update_group")
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
 async def init_weights_update_group(
-    obj: InitWeightsUpdateGroupReqInput, request: Request
+    obj: Annotated[InitWeightsUpdateGroupReqInput, Body()], request: Request
 ):
     """Initialize the parameter update group."""
     success, message = await _global_state.tokenizer_manager.init_weights_update_group(
@@ -1220,7 +1229,7 @@ async def init_weights_update_group(
 @app.post("/destroy_weights_update_group")
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
 async def destroy_weights_update_group(
-    obj: DestroyWeightsUpdateGroupReqInput, request: Request
+    obj: Annotated[DestroyWeightsUpdateGroupReqInput, Body()], request: Request
 ):
     """Destroy the parameter update group."""
     (
@@ -1236,7 +1245,7 @@ async def destroy_weights_update_group(
 @app.post("/update_weights_from_tensor")
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
 async def update_weights_from_tensor(
-    obj: UpdateWeightsFromTensorReqInput, request: Request
+    obj: Annotated[UpdateWeightsFromTensorReqInput, Body()], request: Request
 ):
     """Update the weights from tensor inplace without re-launching the server.
     Notes:
@@ -1258,7 +1267,7 @@ async def update_weights_from_tensor(
 @app.post("/update_weights_from_distributed")
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
 async def update_weights_from_distributed(
-    obj: UpdateWeightsFromDistributedReqInput, request: Request
+    obj: Annotated[UpdateWeightsFromDistributedReqInput, Body()], request: Request
 ):
     """Update model parameter from distributed online."""
     (
@@ -1277,7 +1286,9 @@ async def update_weights_from_distributed(
 
 @app.post("/update_weights_from_ipc")
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def update_weights_from_ipc(obj: UpdateWeightsFromIPCReqInput, request: Request):
+async def update_weights_from_ipc(
+    obj: Annotated[UpdateWeightsFromIPCReqInput, Body()], request: Request
+):
     """Update the weights from IPC (Inter-Process Communication) for checkpoint-engine integration."""
     success, message = await _global_state.tokenizer_manager.update_weights_from_ipc(
         obj, request
@@ -1294,7 +1305,9 @@ async def update_weights_from_ipc(obj: UpdateWeightsFromIPCReqInput, request: Re
 
 @app.post("/update_weight_version")
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def update_weight_version(obj: UpdateWeightVersionReqInput, request: Request):
+async def update_weight_version(
+    obj: Annotated[UpdateWeightVersionReqInput, Body()], request: Request
+):
     """Update the weight version. This operation requires no active requests."""
     if obj.abort_all_requests:
         _global_state.tokenizer_manager.abort_request(abort_all=True)
@@ -1325,7 +1338,9 @@ async def update_weight_version(obj: UpdateWeightVersionReqInput, request: Reque
 
 @app.api_route("/get_weights_by_name", methods=["GET", "POST"])
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def get_weights_by_name(obj: GetWeightsByNameReqInput, request: Request):
+async def get_weights_by_name(
+    obj: Annotated[GetWeightsByNameReqInput, Body()], request: Request
+):
     """Get model parameter by name."""
     try:
         ret = await _global_state.tokenizer_manager.get_weights_by_name(obj, request)
@@ -1340,7 +1355,7 @@ async def get_weights_by_name(obj: GetWeightsByNameReqInput, request: Request):
 @app.api_route("/release_memory_occupation", methods=["GET", "POST"])
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
 async def release_memory_occupation(
-    obj: ReleaseMemoryOccupationReqInput, request: Request
+    obj: Annotated[ReleaseMemoryOccupationReqInput, Body()], request: Request
 ):
     """Release GPU memory occupation temporarily."""
     try:
@@ -1352,7 +1367,7 @@ async def release_memory_occupation(
 @app.api_route("/resume_memory_occupation", methods=["GET", "POST"])
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
 async def resume_memory_occupation(
-    obj: ResumeMemoryOccupationReqInput, request: Request
+    obj: Annotated[ResumeMemoryOccupationReqInput, Body()], request: Request
 ):
     """Resume GPU memory occupation."""
     try:
@@ -1364,7 +1379,8 @@ async def resume_memory_occupation(
 @app.api_route("/weights_checker", methods=["GET", "POST"])
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
 async def check_weights(
-    obj: Optional[CheckWeightsReqInput] = None, request: Request = None
+    obj: Annotated[Optional[CheckWeightsReqInput], Body()] = None,
+    request: Request = None,
 ):
     if obj is None:
         obj = CheckWeightsReqInput()
@@ -1381,7 +1397,7 @@ async def check_weights(
 
 @app.api_route("/slow_down", methods=["GET", "POST"])
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def slow_down(obj: SlowDownReqInput, request: Request):
+async def slow_down(obj: Annotated[SlowDownReqInput, Body()], request: Request):
     """Slow down the system deliberately. Only for testing. Example scenario:
     when we want to test performance of D in large-scale PD disaggregation and have no enough nodes for P,
     we can use this to slow down D to let it have enough running sequences, and then disable slowdown
@@ -1395,7 +1411,9 @@ async def slow_down(obj: SlowDownReqInput, request: Request):
 
 @app.api_route("/load_lora_adapter", methods=["POST"])
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def load_lora_adapter(obj: LoadLoRAAdapterReqInput, request: Request):
+async def load_lora_adapter(
+    obj: Annotated[LoadLoRAAdapterReqInput, Body()], request: Request
+):
     """Load a new LoRA adapter without re-launching the server."""
     result = await _global_state.tokenizer_manager.load_lora_adapter(obj, request)
 
@@ -1413,7 +1431,7 @@ async def load_lora_adapter(obj: LoadLoRAAdapterReqInput, request: Request):
 
 @app.api_route("/load_lora_adapter_from_tensors", methods=["POST"])
 async def load_lora_adapter_from_tensors(
-    obj: LoadLoRAAdapterFromTensorsReqInput, request: Request
+    obj: Annotated[LoadLoRAAdapterFromTensorsReqInput, Body()], request: Request
 ):
     """Load a new LoRA adapter from tensors without re-launching the server."""
     result = await _global_state.tokenizer_manager.load_lora_adapter_from_tensors(
@@ -1428,7 +1446,9 @@ async def load_lora_adapter_from_tensors(
 
 @app.api_route("/unload_lora_adapter", methods=["POST"])
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def unload_lora_adapter(obj: UnloadLoRAAdapterReqInput, request: Request):
+async def unload_lora_adapter(
+    obj: Annotated[UnloadLoRAAdapterReqInput, Body()], request: Request
+):
     """Load a new LoRA adapter without re-launching the server."""
     result = await _global_state.tokenizer_manager.unload_lora_adapter(obj, request)
 
@@ -1445,7 +1465,7 @@ async def unload_lora_adapter(obj: UnloadLoRAAdapterReqInput, request: Request):
 
 
 @app.api_route("/open_session", methods=["GET", "POST"])
-async def open_session(obj: OpenSessionReqInput, request: Request):
+async def open_session(obj: Annotated[OpenSessionReqInput, Body()], request: Request):
     """Open a session, and return its unique session id."""
     try:
         session_id = await _global_state.tokenizer_manager.open_session(obj, request)
@@ -1459,7 +1479,7 @@ async def open_session(obj: OpenSessionReqInput, request: Request):
 
 
 @app.api_route("/close_session", methods=["GET", "POST"])
-async def close_session(obj: CloseSessionReqInput, request: Request):
+async def close_session(obj: Annotated[CloseSessionReqInput, Body()], request: Request):
     """Close the session."""
     try:
         await _global_state.tokenizer_manager.close_session(obj, request)
@@ -1470,7 +1490,9 @@ async def close_session(obj: CloseSessionReqInput, request: Request):
 
 @app.api_route("/configure_logging", methods=["GET", "POST"])
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def configure_logging(obj: ConfigureLoggingReq, request: Request):
+async def configure_logging(
+    obj: Annotated[ConfigureLoggingReq, Body()], request: Request
+):
     """Configure the request logging options."""
     _global_state.tokenizer_manager.configure_logging(obj)
     return Response(status_code=200)
@@ -1478,7 +1500,7 @@ async def configure_logging(obj: ConfigureLoggingReq, request: Request):
 
 @app.post("/abort_request")
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def abort_request(obj: AbortReq, request: Request):
+async def abort_request(obj: Annotated[AbortReq, Body()], request: Request):
     """Abort a request."""
     try:
         _global_state.tokenizer_manager.abort_request(
@@ -1490,7 +1512,9 @@ async def abort_request(obj: AbortReq, request: Request):
 
 
 @app.post("/parse_function_call")
-async def parse_function_call_request(obj: ParseFunctionCallReq, request: Request):
+async def parse_function_call_request(
+    obj: Annotated[ParseFunctionCallReq, Body()], request: Request
+):
     """
     A native API endpoint to parse function calls from a text.
     """
@@ -1512,7 +1536,9 @@ async def parse_function_call_request(obj: ParseFunctionCallReq, request: Reques
 
 
 @app.post("/separate_reasoning")
-async def separate_reasoning_request(obj: SeparateReasoningReqInput, request: Request):
+async def separate_reasoning_request(
+    obj: Annotated[SeparateReasoningReqInput, Body()], request: Request
+):
     """
     A native API endpoint to separate reasoning from a text.
     """
@@ -1520,7 +1546,7 @@ async def separate_reasoning_request(obj: SeparateReasoningReqInput, request: Re
     parser = ReasoningParser(model_type=obj.reasoning_parser, request=request)
 
     # 2) Call the non-stream parsing method (non-stream)
-    if getattr(obj, "return_blocks", False):
+    if obj.return_blocks:
         blocks = parser.parse_non_stream_blocks(obj.text)
         reasoning_blocks = [b["text"] for b in blocks if b["type"] == "reasoning"]
         text_blocks = [b["text"] for b in blocks if b["type"] == "text"]
@@ -1534,7 +1560,7 @@ async def separate_reasoning_request(obj: SeparateReasoningReqInput, request: Re
         "reasoning_text": reasoning_text,
         "text": normal_text,
     }
-    if getattr(obj, "return_blocks", False):
+    if obj.return_blocks:
         response_data["reasoning_blocks"] = reasoning_blocks
         response_data["text_blocks"] = text_blocks
         response_data["blocks"] = blocks
@@ -1544,7 +1570,9 @@ async def separate_reasoning_request(obj: SeparateReasoningReqInput, request: Re
 
 @app.post("/pause_generation")
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def pause_generation(obj: PauseGenerationReqInput, request: Request):
+async def pause_generation(
+    obj: Annotated[PauseGenerationReqInput, Body()], request: Request
+):
     """Pause generation."""
     await _global_state.tokenizer_manager.pause_generation(obj)
     return ORJSONResponse(
@@ -1555,7 +1583,9 @@ async def pause_generation(obj: PauseGenerationReqInput, request: Request):
 
 @app.post("/continue_generation")
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
-async def continue_generation(obj: ContinueGenerationReqInput, request: Request):
+async def continue_generation(
+    obj: Annotated[ContinueGenerationReqInput, Body()], request: Request
+):
     """Continue generation."""
     await _global_state.tokenizer_manager.continue_generation(obj)
     return ORJSONResponse(
@@ -1894,7 +1924,9 @@ async def sagemaker_chat_completions(
 
 ## Vertex AI API
 @app.post(os.environ.get("AIP_PREDICT_ROUTE", "/vertex_generate"))
-async def vertex_generate(vertex_req: VertexGenerateReqInput, raw_request: Request):
+async def vertex_generate(
+    vertex_req: Annotated[VertexGenerateReqInput, Body()], raw_request: Request
+):
     if not vertex_req.instances:
         return []
     inputs = {}
diff --git a/python/sglang/srt/managers/communicator.py b/python/sglang/srt/managers/communicator.py
index 98cdf936c..eca76cba4 100644
--- a/python/sglang/srt/managers/communicator.py
+++ b/python/sglang/srt/managers/communicator.py
@@ -3,9 +3,7 @@ from __future__ import annotations
 import asyncio
 import copy
 from collections import deque
-from typing import Deque, Generic, List, Optional, TypeVar
-
-from sglang.srt.managers.io_struct import sock_send
+from typing import Callable, Deque, Generic, List, Optional, TypeVar
 
 T = TypeVar("T")
 
@@ -22,8 +20,13 @@ class FanOutCommunicator(Generic[T]):
     Only one request is in-flight at any time in either mode.
     """
 
-    def __init__(self, sender, fan_out: int, mode="queueing"):
-        self._sender = sender
+    def __init__(
+        self,
+        send: Callable[[T], None],
+        fan_out: int,
+        mode: str = "queueing",
+    ):
+        self._send = send
         self._fan_out = fan_out
         self._mode = mode
         self._result_event: Optional[asyncio.Event] = None
@@ -41,7 +44,7 @@ class FanOutCommunicator(Generic[T]):
             assert self._result_values is None
 
         if obj is not None:
-            sock_send(self._sender, obj)
+            self._send(obj)
 
         self._result_event = asyncio.Event()
         self._result_values = []
@@ -61,7 +64,7 @@ class FanOutCommunicator(Generic[T]):
             self._result_event = asyncio.Event()
 
             if obj is not None:
-                sock_send(self._sender, obj)
+                self._send(obj)
 
         # Capture local refs before await -- after event fires, the first
         # awakened coroutine clears shared state; later awaiters use local refs.
diff --git a/python/sglang/srt/managers/embed_types.py b/python/sglang/srt/managers/embed_types.py
index 48d6859d9..010e18e56 100644
--- a/python/sglang/srt/managers/embed_types.py
+++ b/python/sglang/srt/managers/embed_types.py
@@ -19,7 +19,7 @@ io_struct.py and schedule_batch.py.
 """
 
 from dataclasses import dataclass
-from typing import List, Union
+from typing import List
 
 import torch
 
@@ -37,7 +37,7 @@ class PositionalEmbeds:
         positions: List of positions where embeddings should be injected.
     """
 
-    embeds: Union[List[torch.Tensor], torch.Tensor]
+    embeds: torch.Tensor
     positions: List[int]
 
     def __post_init__(self):
diff --git a/python/sglang/srt/managers/io_struct.py b/python/sglang/srt/managers/io_struct.py
index 6f87cc667..48e6671e2 100644
--- a/python/sglang/srt/managers/io_struct.py
+++ b/python/sglang/srt/managers/io_struct.py
@@ -14,13 +14,16 @@
 """
 The definition of objects transferred between different
 processes (TokenizerManager, DetokenizerManager, Scheduler).
+
+Keep this file focused on IPC struct definitions so it stays concise. Put
+normalizers, helper utilities, and future non-struct logic in the owning module
+instead, such as sglang.srt.utils.common.
 """
 
 from __future__ import annotations
 
 import copy
 import uuid
-from abc import ABC
 from array import array
 from collections import Counter
 from dataclasses import dataclass, field
@@ -43,7 +46,7 @@ from pydantic import PlainValidator
 
 from sglang.srt.lora.lora_registry import LoRARef
 from sglang.srt.managers.embed_types import PositionalEmbeds
-from sglang.srt.managers.schedule_batch import BaseFinishReason, Modality
+from sglang.srt.managers.schedule_batch import Modality
 from sglang.srt.multimodal.mm_utils import has_valid_data
 from sglang.srt.observability.req_time_stats import (
     APIServerReqTimeStats,
@@ -57,39 +60,20 @@ from sglang.srt.utils.field_validators import validate_optional_list_i64_1d_2d
 # Handle serialization of Image for pydantic
 if TYPE_CHECKING:
     from PIL.Image import Image
-
-    from sglang.srt.managers.tokenizer_manager import SenderWrapper
 else:
     Image = Any
 
 
 @dataclass
-class BaseReq(ABC):
-    rid: Optional[Union[str, List[str]]] = field(default=None, kw_only=True)
+class BaseReq:
+    rid: Optional[str] = field(default=None, kw_only=True)
     http_worker_ipc: Optional[str] = field(default=None, kw_only=True)
 
-    def regenerate_rid(self):
-        """Generate a new request ID and return it."""
-        if isinstance(self.rid, list):
-            self.rid = [uuid.uuid4().hex for _ in range(len(self.rid))]
-        else:
-            self.rid = uuid.uuid4().hex
-        return self.rid
-
-    def _validate_rid_uniqueness(self):
-        """Validate that request IDs within a batch are unique."""
-        if isinstance(self.rid, list) and len(set(self.rid)) != len(self.rid):
-            counts = Counter(self.rid)
-            duplicates = [rid for rid, count in counts.items() if count > 1]
-            raise ValueError(
-                f"Duplicate request IDs detected within the request: {duplicates}"
-            )
-
 
 @dataclass
-class BaseBatchReq(ABC):
+class BaseBatchReq:
     rids: Optional[List[str]] = field(default=None, kw_only=True)
-    http_worker_ipcs: Optional[List[str]] = field(default=None, kw_only=True)
+    http_worker_ipcs: Optional[List[Optional[str]]] = field(default=None, kw_only=True)
 
     def regenerate_rids(self):
         """Generate new request IDs and return them."""
@@ -97,29 +81,6 @@ class BaseBatchReq(ABC):
         return self.rids
 
 
-@dataclass
-class SpeculativeDecodingMetricsMixin:
-    """
-    Mixin class containing speculative decoding metrics.
-
-    This class consolidates speculative decoding metrics that are shared across
-    batch output types that support speculative decoding to avoid code duplication.
-    """
-
-    # Verify count: number of verification forward passes
-    spec_verify_ct: List[int]
-
-    # Accepted drafts: Number of accepted draft tokens during speculative decoding
-    # (strict drafts-only count, excludes the bonus token).
-    spec_num_correct_drafts: List[int]
-
-    # Acceptance histogram: List of lists, where each inner list represents histogram counts.
-    # List index = number of accepted tokens in a step, List value = count of steps with that many accepted tokens.
-    # Example: histogram[0] = 5 means 5 steps with 0 accepted tokens, histogram[3] = 10 means 10 steps with 3 accepted tokens.
-    # Empty list [] when speculative decoding is disabled.
-    spec_correct_drafts_histogram: List[List[int]]
-
-
 # Parameters for a session
 @dataclass
 class SessionParams:
@@ -132,9 +93,9 @@ class SessionParams:
 
 # Type definitions for multimodal input data
 # Individual data item types for each modality
-ImageDataInputItem = Union[Image, str, ImageData, Dict]
+ImageDataInputItem = Union[str, Dict, ImageData, Image]
 AudioDataInputItem = Union[str, Dict]
-VideoDataInputItem = Union[str, VideoData, Dict]
+VideoDataInputItem = Union[str, Dict, VideoData]
 # Union type for any multimodal data item
 MultimodalDataInputItem = Union[
     ImageDataInputItem, VideoDataInputItem, AudioDataInputItem
@@ -146,13 +107,22 @@ MultimodalDataInputFormat = Union[
     MultimodalDataInputItem,
 ]
 
+# Serialized form of BaseFinishReason.to_json() — all values are primitives.
+FinishReasonDict = Dict[str, Optional[Union[str, int, List[int]]]]
+CachedTokensDetails = Dict[str, Union[int, str]]
+
 
 @dataclass
-class GenerateReqInput(BaseReq):
+class GenerateReqInput:
+    # Request ID(s). If omitted, generated during normalization. For batch
+    # requests, a string is expanded to per-item IDs using it as a prefix.
+    rid: Optional[Union[str, List[str]]] = field(default=None, kw_only=True)
+    # Internal IPC endpoint of the HTTP/tokenizer worker that owns this request.
+    # Used to route outputs back in multi-tokenizer mode.
+    http_worker_ipc: Optional[str] = field(default=None, kw_only=True)
     # The input prompt. It can be a single prompt or a batch of prompts.
     text: Optional[Union[List[str], str]] = None
     # The token ids for text.
-    #
     # Use C-loop validator to replace Pydantic per-element type check for efficiency.
     input_ids: Annotated[
         Optional[Union[List[List[int]], List[int]]],
@@ -235,31 +205,27 @@ class GenerateReqInput(BaseReq):
     bootstrap_pair_key: Optional[Union[List[str], str]] = None
     decode_tp_size: Optional[Union[List[Optional[int]], int]] = None
 
-    # Require reasoning for the request (hybrid reasoning model only)
-    require_reasoning: bool = False
-
     # For DP routing — external router assigns a specific DP worker
     routed_dp_rank: Optional[int] = None
     # For PD disagg — hint telling decode which prefill DP worker has the KV cache
     disagg_prefill_dp_rank: Optional[int] = None
-    # Deprecated: use routed_dp_rank instead
-    data_parallel_rank: Optional[int] = None
+
+    # Routing key for routing-key schedule policy
+    routing_key: Optional[str] = None
+    # Conversation id used for tracking requests
+    conversation_id: Optional[str] = None
 
     # For background responses (OpenAI responses API)
     background: bool = False
-
-    # Conversation id used for tracking requests
-    conversation_id: Optional[str] = None
+    # Require reasoning for the request (hybrid reasoning model only)
+    require_reasoning: bool = False
 
     # Priority for the request
     priority: Optional[int] = None
 
-    # Extra key for classifying the request (e.g. cache_salt)
+    # Extra cache key for classifying the request (e.g. cache_salt)
     extra_key: Optional[Union[List[str], str]] = None
 
-    # Routing key for routing-key schedule policy
-    routing_key: Optional[str] = None
-
     # Whether to disallow logging for this request (e.g. due to ZDR)
     no_logs: bool = False
 
@@ -268,10 +234,8 @@ class GenerateReqInput(BaseReq):
 
     # (Internal) Whether to return bytes for image generation
     return_bytes: bool = False
-
     # Whether to return entropy
     return_entropy: bool = False
-
     # Whether to return prompt token IDs without computing logprobs
     return_prompt_token_ids: bool = False
 
@@ -297,6 +261,23 @@ class GenerateReqInput(BaseReq):
     # Batch-level: List[List[int]] (one per request). After __getitem__: List[int].
     multi_item_delimiter_indices: Optional[Union[List[List[int]], List[int]]] = None
 
+    def regenerate_rid(self):
+        """Generate a new request ID and return it."""
+        if isinstance(self.rid, list):
+            self.rid = [uuid.uuid4().hex for _ in range(len(self.rid))]
+        else:
+            self.rid = uuid.uuid4().hex
+        return self.rid
+
+    def _validate_rid_uniqueness(self):
+        """Validate that request IDs within a batch are unique."""
+        if isinstance(self.rid, list) and len(set(self.rid)) != len(self.rid):
+            counts = Counter(self.rid)
+            duplicates = [rid for rid, count in counts.items() if count > 1]
+            raise ValueError(
+                f"Duplicate request IDs detected within the request: {duplicates}"
+            )
+
     def contains_mm_input(self) -> bool:
         return (
             has_valid_data(self.image_data)
@@ -317,18 +298,6 @@ class GenerateReqInput(BaseReq):
             ValueError: If inputs are not properly specified (e.g., none or all of
                        text, input_ids, input_embeds are provided)
         """
-        if self.data_parallel_rank is not None:
-            import warnings
-
-            warnings.warn(
-                "'data_parallel_rank' is deprecated, use 'routed_dp_rank' instead.",
-                DeprecationWarning,
-                stacklevel=2,
-            )
-            if self.routed_dp_rank is None:
-                self.routed_dp_rank = self.data_parallel_rank
-            self.data_parallel_rank = None
-
         self._validate_inputs()
         self._determine_batch_size()
         self._handle_parallel_sampling()
@@ -767,8 +736,11 @@ class TokenizedGenerateReqInput(BaseReq):
     input_text: str
     # The input token ids
     input_ids: Optional[array[int]]
+    # The input embeds
+    input_embeds: Optional[Union[List[List[List[float]]], List[List[float]]]]
     # The multimodal inputs
     mm_inputs: object
+    token_type_ids: Optional[List[int]]
     # The sampling parameters
     sampling_params: SamplingParams
     # Whether to return the logprobs
@@ -778,7 +750,7 @@ class TokenizedGenerateReqInput(BaseReq):
     # If return logprobs, the number of top logprobs to return at each position.
     top_logprobs_num: int
     # If return logprobs, the token id to return logprob for
-    token_ids_logprob: List[int]
+    token_ids_logprob: Optional[List[int]]
     # Whether to stream output
     stream: bool
 
@@ -787,17 +759,10 @@ class TokenizedGenerateReqInput(BaseReq):
 
     # Whether to return captured routed experts
     return_routed_experts: bool = False
+    return_indexer_topk: bool = False
     # See GenerateReqInput.routed_experts_start_len.
     routed_experts_start_len: int = 0
 
-    return_indexer_topk: bool = False
-
-    # The input embeds
-    input_embeds: Optional[Union[List[List[List[float]]], List[List[float]]]] = None
-
-    # Embedding overrides to place at specific token positions.
-    positional_embed_overrides: Optional[PositionalEmbeds] = None
-
     # Session info for continual prompting
     session_params: Optional[SessionParams] = None
 
@@ -808,6 +773,8 @@ class TokenizedGenerateReqInput(BaseReq):
     # of `CustomLogitProcessor` in python/sglang/srt/sampling/custom_logit_processor.py
     # Use the processor's `to_str()` method to generate the serialized string.
     custom_logit_processor: Optional[str] = None
+    # Embedding overrides to place at specific token positions.
+    positional_embed_overrides: Optional[PositionalEmbeds] = None
 
     # For disaggregated inference
     bootstrap_host: Optional[str] = None
@@ -816,35 +783,31 @@ class TokenizedGenerateReqInput(BaseReq):
     bootstrap_pair_key: Optional[str] = None
     decode_tp_size: Optional[int] = None
 
-    # Require reasoning for the request (hybrid reasoning model only)
-    require_reasoning: bool = False
-
     # For DP routing
     routed_dp_rank: Optional[int] = None
     # For PD disagg — hint telling decode which prefill DP worker has the KV cache
     disagg_prefill_dp_rank: Optional[int] = None
 
+    # Routing key for routing-key schedule policy
+    routing_key: Optional[str] = None
+    # Require reasoning for the request (hybrid reasoning model only)
+    require_reasoning: bool = False
+
     # Priority for the request
     priority: Optional[int] = None
 
-    # Extra key for classifying the request (e.g. cache_salt)
+    # Extra cache key for classifying the request (e.g. cache_salt)
     extra_key: Optional[str] = None
 
-    # Routing key for routing-key schedule policy
-    routing_key: Optional[str] = None
-
     # Whether to disallow logging for this request (e.g. due to ZDR)
     no_logs: bool = False
 
     # (Internal) Whether to return bytes for image generation
     return_bytes: bool = False
-
     # Whether to return entropy
     return_entropy: bool = False
 
-    token_type_ids: Optional[List[int]] = None
-
-    need_wait_for_mm_inputs: bool = False
+    need_wait_for_mm_inputs: Optional[bool] = None
     num_items_assigned: Optional[Dict[Modality, List[int]]] = None
     mm_data_mooncake: Optional[List] = None
     # Encoder URL snapshot frozen at tokenizer-side dispatch time so that
@@ -875,9 +838,19 @@ class BatchTokenizedGenerateReqInput(BaseBatchReq):
 
 
 @dataclass
-class EmbeddingReqInput(BaseReq):
+class EmbeddingReqInput:
+    # Request ID(s). If omitted, generated during normalization. For batch
+    # requests, a string is expanded to per-item IDs using it as a prefix.
+    rid: Optional[Union[str, List[str]]] = field(default=None, kw_only=True)
+    # Internal IPC endpoint of the HTTP/tokenizer worker that owns this request.
+    # Used to route outputs back in multi-tokenizer mode.
+    http_worker_ipc: Optional[str] = field(default=None, kw_only=True)
     # The input prompt. It can be a single prompt or a batch of prompts.
     text: Optional[Union[List[List[str]], List[str], str]] = None
+    # The token ids for text; one can either specify text or input_ids.
+    input_ids: Optional[Union[List[List[int]], List[int]]] = None
+    # Dummy input embeds for compatibility
+    input_embeds: Optional[Union[List[List[List[float]]], List[List[float]]]] = None
     # The image input. It can be an image instance, file name, URL, or base64 encoded string.
     # Can be formatted as:
     # - Single image for a single request
@@ -889,8 +862,6 @@ class EmbeddingReqInput(BaseReq):
     video_data: Optional[MultimodalDataInputFormat] = None
     # The audio input. Like image data, it can be a file name, a url, or base64 encoded string.
     audio_data: Optional[MultimodalDataInputFormat] = None
-    # The token ids for text; one can either specify text or input_ids.
-    input_ids: Optional[Union[List[List[int]], List[int]]] = None
     # Placeholder token ID used to locate embedding override positions in input token IDs.
     embed_override_token_id: Optional[int] = None
     # Unresolved embedding overrides: per-input list of tensors.
@@ -900,49 +871,61 @@ class EmbeddingReqInput(BaseReq):
     # Runtime type: Optional[List[Optional[List[torch.Tensor]]]]
     # Typed as Any to avoid Pydantic/FastAPI schema errors (contains torch.Tensor).
     embed_overrides: Any = None
+    # The path to the LoRA adaptors
+    lora_path: Optional[Union[List[Optional[str]], Optional[str]]] = None
+    # The uid of LoRA adaptors, should be initialized by tokenizer manager
+    lora_id: Optional[Union[List[Optional[str]], Optional[str]]] = None
     # Resolved embedding overrides with positions (set by tokenizer manager or score mixin).
     # Runtime type: Optional[Union[PositionalEmbeds, List[Optional[PositionalEmbeds]]]]
     positional_embed_overrides: Any = None
     # Dummy sampling params for compatibility
     sampling_params: Optional[Union[List[Dict], Dict]] = None
-    # Dummy input embeds for compatibility
-    input_embeds: Optional[Union[List[List[List[float]]], List[List[float]]]] = None
     # Whether to log metrics for this request (e.g. health_generate calls do not log metrics)
     log_metrics: bool = True
     # The modalities of the image data [image, multi-images, video]
     modalities: Optional[List[str]] = None
     # For cross-encoder requests
     is_cross_encoder_request: bool = False
-    # Priority for the request
-    priority: Optional[int] = None
     # Routing key for routing-key schedule policy
     routing_key: Optional[str] = None
 
     # For background responses (OpenAI responses API)
     background: bool = False
+    # Priority for the request
+    priority: Optional[int] = None
+
+    # The number of dimensions the resulting output embeddings should have. It is applicable for Matryoshka Embeddings.
+    dimensions: Optional[int] = None
+    # Whether to return pooled hidden states (pre-head transformer output)
+    return_pooled_hidden_states: bool = False
+    # Whether to return prompt token IDs without computing logprobs
+    return_prompt_token_ids: bool = False
 
     # Propagates trace context via Engine.encode/async_encode
     external_trace_header: Optional[Dict] = None
     received_time: Optional[float] = None
 
-    # The number of dimensions the resulting output embeddings should have. It is applicable for Matryoshka Embeddings.
-    dimensions: Optional[int] = None
-
-    # The path to the LoRA adaptors
-    lora_path: Optional[Union[List[Optional[str]], Optional[str]]] = None
-    # The uid of LoRA adaptors, should be initialized by tokenizer manager
-    lora_id: Optional[Union[List[Optional[str]], Optional[str]]] = None
-
-    # Whether to return pooled hidden states (pre-head transformer output)
-    return_pooled_hidden_states: bool = False
-
-    # Whether to return prompt token IDs without computing logprobs
-    return_prompt_token_ids: bool = False
-
     # Pre-computed delimiter indices for multi-item scoring.
     # Batch-level: List[List[int]] (one per request). After __getitem__: List[int].
     multi_item_delimiter_indices: Optional[Union[List[List[int]], List[int]]] = None
 
+    def regenerate_rid(self):
+        """Generate a new request ID and return it."""
+        if isinstance(self.rid, list):
+            self.rid = [uuid.uuid4().hex for _ in range(len(self.rid))]
+        else:
+            self.rid = uuid.uuid4().hex
+        return self.rid
+
+    def _validate_rid_uniqueness(self):
+        """Validate that request IDs within a batch are unique."""
+        if isinstance(self.rid, list) and len(set(self.rid)) != len(self.rid):
+            counts = Counter(self.rid)
+            duplicates = [rid for rid, count in counts.items() if count > 1]
+            raise ValueError(
+                f"Duplicate request IDs detected within the request: {duplicates}"
+            )
+
     def normalize_batch_and_arguments(self):
         # at least one of text, input_ids, or image should be provided
         if self.text is None and self.input_ids is None and self.image_data is None:
@@ -1092,12 +1075,14 @@ class TokenizedEmbeddingReqInput(BaseReq):
     input_text: str
     # The input token ids
     input_ids: array[int]
-    # The image inputs
-    image_inputs: dict
+    # The multimodal inputs
+    mm_inputs: object
     # The token type ids
-    token_type_ids: List[int]
+    token_type_ids: Optional[List[int]]
     # Dummy sampling params for compatibility
     sampling_params: SamplingParams
+    # LoRA related
+    lora_id: Optional[str] = None  # None means just use the base model
     # Embedding overrides to place at specific token positions.
     positional_embed_overrides: Optional[PositionalEmbeds] = None
     # For DP routing
@@ -1106,17 +1091,14 @@ class TokenizedEmbeddingReqInput(BaseReq):
     priority: Optional[int] = None
     # The number of dimensions the resulting output embeddings should have. It is applicable for Matryoshka Embeddings.
     dimensions: Optional[int] = None
-
-    # LoRA related
-    lora_id: Optional[str] = None  # None means just use the base model
     # Pre-computed delimiter indices for multi-item scoring
     multi_item_delimiter_indices: Optional[List[int]] = None
-    # For observability
-    time_stats: Optional[Union[APIServerReqTimeStats, DPControllerReqTimeStats]] = None
-
     # Whether to return pooled hidden states (pre-head transformer output)
     return_pooled_hidden_states: bool = False
 
+    # For observability
+    time_stats: Optional[Union[APIServerReqTimeStats, DPControllerReqTimeStats]] = None
+
 
 @dataclass
 class BatchTokenizedEmbeddingReqInput(BaseBatchReq):
@@ -1133,10 +1115,18 @@ class BatchTokenizedEmbeddingReqInput(BaseBatchReq):
         return iter(self.batch)
 
 
+TokenLogprobValues = Optional[List[List[Optional[float]]]]
+TokenLogprobIndices = Optional[List[List[Optional[int]]]]
+TopLogprobValues = Optional[List[Optional[List[Optional[List[float]]]]]]
+TopLogprobIndices = Optional[List[Optional[List[Optional[List[int]]]]]]
+HiddenStateChunk = List[Optional[Union[float, List[float]]]]
+OutputHiddenStates = Optional[List[Optional[List[HiddenStateChunk]]]]
+
+
 @dataclass
-class BatchTokenIDOutput(BaseBatchReq, SpeculativeDecodingMetricsMixin):
+class BatchTokenIDOutput(BaseBatchReq):
     # The finish reason
-    finished_reasons: List[BaseFinishReason]
+    finished_reasons: List[Optional[FinishReasonDict]]
     # For incremental decoding
     decoded_texts: List[str]
     decode_ids: List[array[int]]
@@ -1155,49 +1145,49 @@ class BatchTokenIDOutput(BaseBatchReq, SpeculativeDecodingMetricsMixin):
     cached_tokens: List[int]
 
     # Logprobs
-    input_token_logprobs_val: List[float]
-    input_token_logprobs_idx: List[int]
-    output_token_logprobs_val: List[float]
-    output_token_logprobs_idx: List[int]
-    input_top_logprobs_val: List[List]
-    input_top_logprobs_idx: List[List]
-    output_top_logprobs_val: List[List]
-    output_top_logprobs_idx: List[List]
-    input_token_ids_logprobs_val: List[List]
-    input_token_ids_logprobs_idx: List[List]
-    output_token_ids_logprobs_val: List[List]
-    output_token_ids_logprobs_idx: List[List]
-    output_token_entropy_val: List[float]
+    input_token_logprobs_val: TokenLogprobValues
+    input_token_logprobs_idx: TokenLogprobIndices
+    output_token_logprobs_val: TokenLogprobValues
+    output_token_logprobs_idx: TokenLogprobIndices
+    input_top_logprobs_val: TopLogprobValues
+    input_top_logprobs_idx: TopLogprobIndices
+    output_top_logprobs_val: TopLogprobValues
+    output_top_logprobs_idx: TopLogprobIndices
+    input_token_ids_logprobs_val: TokenLogprobValues
+    input_token_ids_logprobs_idx: TokenLogprobIndices
+    output_token_ids_logprobs_val: TokenLogprobValues
+    output_token_ids_logprobs_idx: TokenLogprobIndices
+    output_token_entropy_val: Optional[List[Optional[float]]]
 
     # Hidden states
-    output_hidden_states: List[List[float]]
+    output_hidden_states: OutputHiddenStates
 
     # Per-request routed experts (input + output tokens), shape
     # (token, layer, top_k). DetokenizerManager encodes to base64 into
     # BatchStrOutput; on the skip_tokenizer_init path the scheduler sends this
     # straight to TokenizerManager, which encodes on demand.
-    routed_experts: List[Optional[torch.Tensor]]
+    routed_experts: Optional[List[Optional[torch.Tensor]]]
 
-    indexer_topk: List[Optional[torch.Tensor]]
+    indexer_topk: Optional[List[Optional[torch.Tensor]]]
 
     # The information of placeholder tokens (e.g., image token)
     # idx is the index of the token in the prompt after expansion.
     # val is the length of padded tokens after expansion.
-    placeholder_tokens_idx: List[Optional[List[int]]]
-    placeholder_tokens_val: List[Optional[List[int]]]
+    placeholder_tokens_idx: Optional[List[Optional[List[int]]]]
+    placeholder_tokens_val: Optional[List[Optional[List[int]]]]
 
     # Number of times each request was retracted.
-    retraction_counts: List[int]
+    retraction_counts: Optional[List[int]] = None
 
     # The trainer step id. Used to know which step's weights are used for sampling.
-    token_steps: List[List[int]] = None
+    token_steps: Optional[List[List[int]]] = None
 
     # Customized info
     customized_info: Optional[Dict[str, List[Any]]] = None
     # Detailed breakdown of cached tokens by source (device/host/storage)
-    cached_tokens_details: Optional[List[Optional[Dict[str, Any]]]] = None
+    cached_tokens_details: Optional[List[Optional[CachedTokensDetails]]] = None
     # DP rank of the scheduler that processed each request
-    dp_ranks: Optional[List[int]] = None
+    dp_ranks: Optional[List[Optional[int]]] = None
 
     # For observability
     time_stats: Optional[List[SchedulerReqTimeStats]] = None
@@ -1207,15 +1197,22 @@ class BatchTokenIDOutput(BaseBatchReq, SpeculativeDecodingMetricsMixin):
     audio_tokens: Optional[List[int]] = None
     video_tokens: Optional[List[int]] = None
 
+    # Verify count: number of verification forward passes
+    spec_verify_ct: Optional[List[int]] = None
+    # Accepted drafts
+    spec_num_correct_drafts: Optional[List[int]] = None
+    # Acceptance histogram
+    spec_correct_drafts_histogram: Optional[List[List[int]]] = None
+
 
 @dataclass
-class BatchStrOutput(BaseBatchReq, SpeculativeDecodingMetricsMixin):
+class BatchStrOutput(BaseBatchReq):
     # The finish reason
-    finished_reasons: List[dict]
+    finished_reasons: List[Optional[FinishReasonDict]]
     # The output decoded strings
     output_strs: List[str]
     # The token ids
-    output_ids: Optional[List[int]]
+    output_ids: Optional[List[array]]
 
     # Token counts
     prompt_tokens: List[int]
@@ -1224,48 +1221,48 @@ class BatchStrOutput(BaseBatchReq, SpeculativeDecodingMetricsMixin):
     cached_tokens: List[int]
 
     # Logprobs
-    input_token_logprobs_val: List[float]
-    input_token_logprobs_idx: List[int]
-    output_token_logprobs_val: List[float]
-    output_token_logprobs_idx: List[int]
-    input_top_logprobs_val: List[List]
-    input_top_logprobs_idx: List[List]
-    output_top_logprobs_val: List[List]
-    output_top_logprobs_idx: List[List]
-    input_token_ids_logprobs_val: List[List]
-    input_token_ids_logprobs_idx: List[List]
-    output_token_ids_logprobs_val: List[List]
-    output_token_ids_logprobs_idx: List[List]
-    output_token_entropy_val: List[float]
+    input_token_logprobs_val: TokenLogprobValues
+    input_token_logprobs_idx: TokenLogprobIndices
+    output_token_logprobs_val: TokenLogprobValues
+    output_token_logprobs_idx: TokenLogprobIndices
+    input_top_logprobs_val: TopLogprobValues
+    input_top_logprobs_idx: TopLogprobIndices
+    output_top_logprobs_val: TopLogprobValues
+    output_top_logprobs_idx: TopLogprobIndices
+    input_token_ids_logprobs_val: TokenLogprobValues
+    input_token_ids_logprobs_idx: TokenLogprobIndices
+    output_token_ids_logprobs_val: TokenLogprobValues
+    output_token_ids_logprobs_idx: TokenLogprobIndices
+    output_token_entropy_val: Optional[List[Optional[float]]]
 
     # Hidden states
-    output_hidden_states: List[List[float]]
+    output_hidden_states: OutputHiddenStates
 
     # Per-request routed experts, base64-encoded by DetokenizerManager off the
     # tokenizer hot path. Underlying tensor shape is (token, layer, top_k);
     # see BatchTokenIDOutput.routed_experts.
-    routed_experts: List[Optional[str]]
+    routed_experts: Optional[List[Optional[str]]]
 
-    indexer_topk: List[Optional[str]]
+    indexer_topk: Optional[List[Optional[str]]]
 
     # The information of placeholder tokens (e.g., image token)
     # idx is the index of the token in the prompt after expansion.
     # val is the length of padded tokens after expansion.
-    placeholder_tokens_idx: List[Optional[List[int]]]
-    placeholder_tokens_val: List[Optional[List[int]]]
+    placeholder_tokens_idx: Optional[List[Optional[List[int]]]]
+    placeholder_tokens_val: Optional[List[Optional[List[int]]]]
 
     # Number of times each request was retracted.
-    retraction_counts: List[int]
+    retraction_counts: Optional[List[int]] = None
 
     # The trainer step id. Used to know which step's weights are used for sampling.
-    token_steps: List[List[int]] = None
+    token_steps: Optional[List[List[int]]] = None
 
     # Customized info
     customized_info: Optional[Dict[str, List[Any]]] = None
     # Detailed breakdown of cached tokens by source (device/host/storage)
-    cached_tokens_details: Optional[List[Optional[Dict[str, Any]]]] = None
+    cached_tokens_details: Optional[List[Optional[CachedTokensDetails]]] = None
     # DP rank of the scheduler that processed each request
-    dp_ranks: Optional[List[int]] = None
+    dp_ranks: Optional[List[Optional[int]]] = None
 
     # For observability
     time_stats: Optional[List[SchedulerReqTimeStats]] = None
@@ -1275,24 +1272,31 @@ class BatchStrOutput(BaseBatchReq, SpeculativeDecodingMetricsMixin):
     audio_tokens: Optional[List[int]] = None
     video_tokens: Optional[List[int]] = None
 
+    # Verify count: number of verification forward passes
+    spec_verify_ct: Optional[List[int]] = None
+    # Accepted drafts
+    spec_num_correct_drafts: Optional[List[int]] = None
+    # Acceptance histogram
+    spec_correct_drafts_histogram: Optional[List[List[int]]] = None
+
 
 @dataclass
 class BatchEmbeddingOutput(BaseBatchReq):
     # The finish reason
-    finished_reasons: List[BaseFinishReason]
+    finished_reasons: List[Optional[FinishReasonDict]]
     # The output embedding
     embeddings: Union[List[List[float]], List[Dict[int, float]]]
     # Token counts
     prompt_tokens: List[int]
     cached_tokens: List[int]
     # Placeholder token info
-    placeholder_tokens_idx: List[Optional[List[int]]]
-    placeholder_tokens_val: List[Optional[List[int]]]
+    placeholder_tokens_idx: Optional[List[Optional[List[int]]]]
+    placeholder_tokens_val: Optional[List[Optional[List[int]]]]
 
     # Number of times each request was retracted.
-    retraction_counts: List[int]
+    retraction_counts: Optional[List[int]] = None
     # Detailed breakdown of cached tokens by source (device/host/storage)
-    cached_tokens_details: Optional[List[Optional[Dict[str, Any]]]] = None
+    cached_tokens_details: Optional[List[Optional[CachedTokensDetails]]] = None
 
     # For observability
     time_stats: Optional[List[SchedulerReqTimeStats]] = None
@@ -1378,26 +1382,6 @@ class AttachHiCacheStorageReqInput(BaseReq):
     hicache_storage_prefetch_policy: Optional[str] = None
     hicache_write_policy: Optional[str] = None
 
-    def __post_init__(self):
-        if self.hicache_storage_prefetch_policy is None:
-            pass
-        else:
-            allowed = ["best_effort", "wait_complete", "timeout"]
-            if self.hicache_storage_prefetch_policy not in allowed:
-                raise ValueError(
-                    f"Invalid hicache_storage_prefetch_policy: {self.hicache_storage_prefetch_policy!r}. "
-                    f"Expected one of {allowed}."
-                )
-
-        if self.hicache_write_policy is None:
-            return
-        allowed = ["write_back", "write_through", "write_through_selective"]
-        if self.hicache_write_policy not in allowed:
-            raise ValueError(
-                f"Invalid hicache_write_policy: {self.hicache_write_policy!r}. "
-                f"Expected one of {allowed}."
-            )
-
 
 @dataclass
 class AttachHiCacheStorageReqOutput(BaseReq):
@@ -1440,13 +1424,6 @@ class PauseGenerationReqInput(BaseReq):
 
     mode: Literal["abort", "retract", "in_place"] = "abort"
 
-    def __post_init__(self):
-        allowed = ["abort", "retract", "in_place"]
-        if self.mode not in allowed:
-            raise ValueError(
-                f"Invalid mode: {self.mode!r}. " f"Expected one of {allowed}."
-            )
-
 
 @dataclass
 class ContinueGenerationReqInput(BaseReq):
@@ -1459,14 +1436,14 @@ class ContinueGenerationReqInput(BaseReq):
 
 
 @dataclass
-class TokenizerWorkerRegistration:
+class TokenizerWorkerRegistrationReq(BaseReq):
     """Sent by each TokenizerWorker on startup to register its IPC name with the router."""
 
     worker_ipc_name: str
 
 
 @dataclass
-class PauseContinueBroadcast:
+class PauseContinueBroadcastReq(BaseReq):
     """Broadcast from router to all workers to set is_pause state."""
 
     is_pause: bool
@@ -1636,7 +1613,7 @@ class InitWeightsUpdateGroupReqInput(BaseReq):
     # The master address
     master_address: str
     # The master port
-    master_port: int
+    master_port: Union[int, str]
     # The rank offset
     rank_offset: int
     # The world size
@@ -1733,8 +1710,8 @@ class SlowDownReqOutput(BaseReq):
 class AbortReq(BaseReq):
     # Whether to abort all requests
     abort_all: bool = False
-    # The finished reason data
-    finished_reason: Optional[Dict[str, Any]] = None
+    # The finished reason data (from BaseFinishReason.to_json())
+    finished_reason: Optional[FinishReasonDict] = None
     abort_message: Optional[str] = None
 
     def __post_init__(self):
@@ -1876,7 +1853,7 @@ class ExpertDistributionReqOutput(BaseReq):
 class Function:
     description: Optional[str] = None
     name: Optional[str] = None
-    parameters: Optional[object] = None
+    parameters: Optional[Any] = None
 
 
 @dataclass
@@ -1993,7 +1970,7 @@ class BlockReqType(Enum):
 
 @dataclass
 class BlockReqInput(BaseReq):
-    type: BlockReqType
+    req_type: BlockReqType
 
 
 @dataclass
@@ -2191,7 +2168,7 @@ class DumperControlReqOutput(BaseReq):
 
 
 def sock_send(
-    sender: Union[zmq.Socket, zmq.asyncio.Socket, SenderWrapper],
+    sender: Union[zmq.Socket, zmq.asyncio.Socket],
     obj: Any,
     flags: int = 0,
 ) -> None:
@@ -2203,7 +2180,7 @@ def sock_recv(socket, flags=0):
 
 
 async def async_sock_send(
-    sender: Union[zmq.asyncio.Socket, SenderWrapper],
+    sender: zmq.asyncio.Socket,
     obj: Any,
     flags: int = 0,
 ) -> None:
@@ -2214,6 +2191,14 @@ async def async_sock_recv(socket, flags=0):
     return await socket.recv_pyobj(flags=flags)
 
 
+# The following request types are either defined in other files,
+# or not subclasses of BaseReq/BaseBatchReq, so we skip the check for them.
+_IGNORE_REQ_TYPES_CHECK = (
+    GenerateReqInput.__name__,
+    EmbeddingReqInput.__name__,
+)
+
+
 def _check_all_req_types():
     """A helper function to check all request types are defined in this file."""
     import inspect
@@ -2223,6 +2208,8 @@ def _check_all_req_types():
     for class_type in all_classes:
         # check its name
         name = class_type[0]
+        if name in _IGNORE_REQ_TYPES_CHECK:
+            continue
         is_io_struct = (
             name.endswith("Req") or name.endswith("Input") or name.endswith("Output")
         )
diff --git a/python/sglang/srt/managers/multi_tokenizer_mixin.py b/python/sglang/srt/managers/multi_tokenizer_mixin.py
index ddc376992..e27214468 100644
--- a/python/sglang/srt/managers/multi_tokenizer_mixin.py
+++ b/python/sglang/srt/managers/multi_tokenizer_mixin.py
@@ -29,7 +29,7 @@ import sys
 import threading
 import zlib
 from multiprocessing import shared_memory
-from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union
+from typing import TYPE_CHECKING, Any, Dict, List, Optional
 
 import psutil
 import setproctitle
@@ -46,9 +46,9 @@ from sglang.srt.managers.io_struct import (
     BatchTokenIDOutput,
     ContinueGenerationReqInput,
     FreezeGCReq,
-    PauseContinueBroadcast,
+    PauseContinueBroadcastReq,
     PauseGenerationReqInput,
-    TokenizerWorkerRegistration,
+    TokenizerWorkerRegistrationReq,
     async_sock_recv,
     async_sock_send,
     sock_recv,
@@ -437,7 +437,7 @@ class MultiTokenizerRouter:
         while True:
             recv_obj = await async_sock_recv(self.receive_from_worker)
 
-            if isinstance(recv_obj, TokenizerWorkerRegistration):
+            if isinstance(recv_obj, TokenizerWorkerRegistrationReq):
                 if recv_obj.worker_ipc_name not in self.all_worker_ipcs:
                     self.all_worker_ipcs.add(recv_obj.worker_ipc_name)
                     logger.info(
@@ -451,7 +451,7 @@ class MultiTokenizerRouter:
             ):
                 # Broadcast to ALL workers so every worker's is_pause is set
                 is_pause = isinstance(recv_obj, PauseGenerationReqInput)
-                broadcast = PauseContinueBroadcast(is_pause=is_pause)
+                broadcast = PauseContinueBroadcastReq(is_pause=is_pause)
                 for ipc_name in self.all_worker_ipcs:
                     self.socket_mapping.send_output(ipc_name, broadcast)
                 # Forward to scheduler rank 0 (it broadcasts to all TP/PP/DP
@@ -603,18 +603,18 @@ class TokenizerWorker(TokenizerManager):
         )
 
         # Register this worker with the router for pause/continue broadcasting
-        reg = TokenizerWorkerRegistration(worker_ipc_name=self.tokenizer_ipc_name)
-        sock_send(self.send_to_scheduler, reg)
+        reg = TokenizerWorkerRegistrationReq(worker_ipc_name=self.tokenizer_ipc_name)
+        self._dispatch_to_scheduler(reg)
 
         # Future for awaiting pause/continue broadcast confirmation
         self._pause_continue_future: Optional[asyncio.Future] = None
 
-        # Register PauseContinueBroadcast in the result dispatcher so
+        # Register PauseContinueBroadcastReq in the result dispatcher so
         # handle_loop routes it to _handle_pause_continue_broadcast
         from sglang.utils import TypeBasedDispatcher
 
         self._result_dispatcher += TypeBasedDispatcher(
-            [(PauseContinueBroadcast, self._handle_pause_continue_broadcast)]
+            [(PauseContinueBroadcastReq, self._handle_pause_continue_broadcast)]
         )
 
     async def pause_generation(self, obj: PauseGenerationReqInput):
@@ -622,7 +622,7 @@ class TokenizerWorker(TokenizerManager):
         self._pause_continue_future = loop.create_future()
         # Send to router which will broadcast to all workers
         # (router also handles forwarding to scheduler for non-abort modes)
-        sock_send(self.send_to_scheduler, obj)
+        self._dispatch_to_scheduler(obj)
         await self._pause_continue_future
 
         if obj.mode == "abort":
@@ -637,15 +637,15 @@ class TokenizerWorker(TokenizerManager):
     async def continue_generation(self, obj: ContinueGenerationReqInput):
         loop = asyncio.get_event_loop()
         self._pause_continue_future = loop.create_future()
-        sock_send(self.send_to_scheduler, obj)
+        self._dispatch_to_scheduler(obj)
         await self._pause_continue_future
 
-    def _handle_pause_continue_broadcast(self, obj: PauseContinueBroadcast):
+    def _handle_pause_continue_broadcast(self, obj: PauseContinueBroadcastReq):
         """Called from handle_loop when a broadcast arrives from the router."""
         loop = asyncio.get_event_loop()
         loop.create_task(self._apply_pause_continue_broadcast(obj))
 
-    async def _apply_pause_continue_broadcast(self, obj: PauseContinueBroadcast):
+    async def _apply_pause_continue_broadcast(self, obj: PauseContinueBroadcastReq):
         """Apply pause/continue state under the condition lock."""
         async with self.is_pause_cond:
             if obj.is_pause:
@@ -659,15 +659,6 @@ class TokenizerWorker(TokenizerManager):
             self._pause_continue_future.set_result(True)
             self._pause_continue_future = None
 
-    def _attach_multi_http_worker_info(self, req: Union[BaseReq, BaseBatchReq]):
-
-        if isinstance(req, BaseReq):
-            req.http_worker_ipc = self.tokenizer_ipc_name
-        elif isinstance(req, BaseBatchReq):
-            req.http_worker_ipcs = [self.tokenizer_ipc_name] * len(req.rids)
-        else:
-            raise ValueError(f"Unknown req type: {type(req)}")
-
 
 async def print_exception_wrapper(func):
     """
diff --git a/python/sglang/srt/managers/scheduler.py b/python/sglang/srt/managers/scheduler.py
index fdc99616e..525ed2e03 100644
--- a/python/sglang/srt/managers/scheduler.py
+++ b/python/sglang/srt/managers/scheduler.py
@@ -2448,8 +2448,8 @@ class Scheduler(
         req.tokenizer = self.tokenizer
 
         # Handle multimodal inputs
-        if recv_req.image_inputs is not None:
-            image_inputs = self._get_multimodal_inputs(recv_req.image_inputs)
+        if recv_req.mm_inputs is not None:
+            image_inputs = self._get_multimodal_inputs(recv_req.mm_inputs)
             # Expand a single image token into multiple dummy tokens for receiving image embeddings
             # The `pad_input_ids_func` is model-specific and may be None for
             # embedding models or models not requiring special padding.
@@ -3793,9 +3793,13 @@ class Scheduler(
             for k, v in server_args_dict.items():
                 setattr(get_global_server_args(), k, v)
             logger.info(f"Global server args updated! {get_global_server_args()=}")
+
+        server_args = dict(vars(get_global_server_args()))
+        # This field is not serializable.
+        server_args.pop("model_config", None)
         return SetInternalStateReqOutput(
-            updated=True,
-            server_args=vars(get_global_server_args()),
+            updated=if_success,
+            server_args=server_args,
         )
 
     def save_remote_model(self, **kwargs):
diff --git a/python/sglang/srt/managers/scheduler_components/output_streamer.py b/python/sglang/srt/managers/scheduler_components/output_streamer.py
index f95c59f6f..488d63dd4 100644
--- a/python/sglang/srt/managers/scheduler_components/output_streamer.py
+++ b/python/sglang/srt/managers/scheduler_components/output_streamer.py
@@ -18,6 +18,7 @@ from sglang.srt.environ import envs
 from sglang.srt.managers.io_struct import (
     BatchEmbeddingOutput,
     BatchTokenIDOutput,
+    CachedTokensDetails,
 )
 from sglang.srt.managers.schedule_batch import (
     BaseFinishReason,
@@ -55,7 +56,7 @@ class SchedulerOutputStreamer:
                 storage_backend_type = type(storage_backend).__name__
         return storage_backend_type
 
-    def get_cached_tokens_details(self, req: Req) -> Optional[dict]:
+    def get_cached_tokens_details(self, req: Req) -> Optional[CachedTokensDetails]:
         """Get detailed cache breakdown for a request, if available.
 
         Returns:
@@ -246,7 +247,7 @@ class _GenerationStreamAccumulator:
     disaggregation_mode: DisaggregationMode
     default_stream_interval: int
     default_force_stream_interval: int
-    get_cached_tokens_details: Callable[[Req], Optional[dict]]
+    get_cached_tokens_details: Callable[[Req], Optional[CachedTokensDetails]]
 
     rids: list = field(default_factory=list)
     http_worker_ipcs: list = field(default_factory=list)
diff --git a/python/sglang/srt/managers/scheduler_input_blocker.py b/python/sglang/srt/managers/scheduler_input_blocker.py
index 19735cc9c..64235d2ea 100644
--- a/python/sglang/srt/managers/scheduler_input_blocker.py
+++ b/python/sglang/srt/managers/scheduler_input_blocker.py
@@ -14,9 +14,9 @@
 import logging
 from contextlib import contextmanager
 from enum import Enum, auto
-from typing import Any, List, Optional
+from typing import Any, Callable, List, Optional
 
-from sglang.srt.managers.io_struct import BlockReqInput, BlockReqType, sock_send
+from sglang.srt.managers.io_struct import BlockReqInput, BlockReqType
 from sglang.srt.utils.poll_based_barrier import PollBasedBarrier
 
 logger = logging.getLogger(__name__)
@@ -51,10 +51,10 @@ class SchedulerInputBlocker:
 
     def _handle_recv_req(self, recv_req):
         if isinstance(recv_req, BlockReqInput):
-            if recv_req.type == BlockReqType.BLOCK:
+            if recv_req.req_type == BlockReqType.BLOCK:
                 self._execute_block_req()
                 return []
-            elif recv_req.type == BlockReqType.UNBLOCK:
+            elif recv_req.req_type == BlockReqType.UNBLOCK:
                 self._execute_unblock_req()
                 return []
             else:
@@ -98,9 +98,9 @@ class _State(Enum):
 
 
 @contextmanager
-def input_blocker_guard_region(send_to_scheduler):
-    sock_send(send_to_scheduler, BlockReqInput(BlockReqType.BLOCK))
+def input_blocker_guard_region(dispatch_to_scheduler: Callable[[BlockReqInput], None]):
+    dispatch_to_scheduler(BlockReqInput(req_type=BlockReqType.BLOCK))
     try:
         yield
     finally:
-        sock_send(send_to_scheduler, BlockReqInput(BlockReqType.UNBLOCK))
+        dispatch_to_scheduler(BlockReqInput(req_type=BlockReqType.UNBLOCK))
diff --git a/python/sglang/srt/managers/tokenizer_control_mixin.py b/python/sglang/srt/managers/tokenizer_control_mixin.py
index 5bbfe8dbf..53b376705 100644
--- a/python/sglang/srt/managers/tokenizer_control_mixin.py
+++ b/python/sglang/srt/managers/tokenizer_control_mixin.py
@@ -71,8 +71,6 @@ from sglang.srt.managers.io_struct import (
     UpdateWeightsFromIPCReqOutput,
     UpdateWeightsFromTensorReqInput,
     UpdateWeightsFromTensorReqOutput,
-    async_sock_send,
-    sock_send,
 )
 from sglang.srt.managers.load_snapshot import LoadSnapshot
 from sglang.srt.server_args import LoRARef, ServerArgs
@@ -134,7 +132,11 @@ class TokenizerControlMixin:
         for spec in _COMMUNICATOR_SPECS:
             name, resp_type = spec[0], spec[1]
             mode = spec[2] if len(spec) > 2 else "queueing"
-            comm = FanOutCommunicator(self.send_to_scheduler, server_args.dp_size, mode)
+            comm = FanOutCommunicator(
+                self._dispatch_to_scheduler,
+                server_args.dp_size,
+                mode,
+            )
             setattr(self, f"{name}_communicator", comm)
             dispatch_pairs.append((resp_type, comm.handle_recv))
         self._result_dispatcher += TypeBasedDispatcher(dispatch_pairs)
@@ -848,7 +850,7 @@ class TokenizerControlMixin:
 
         future = asyncio.Future()
         self.session_futures[obj.session_id] = future
-        sock_send(self.send_to_scheduler, obj)
+        self._dispatch_to_scheduler(obj)
 
         try:
             return await future
@@ -860,7 +862,7 @@ class TokenizerControlMixin:
         obj: CloseSessionReqInput,
         request: Optional[fastapi.Request] = None,
     ):
-        await async_sock_send(self.send_to_scheduler, obj)
+        await self._async_dispatch_to_scheduler(obj)
 
     def _update_weight_version_if_provided(
         self: TokenizerManager, weight_version: Optional[str]
diff --git a/python/sglang/srt/managers/tokenizer_manager.py b/python/sglang/srt/managers/tokenizer_manager.py
index 532aa7790..2984b0e41 100644
--- a/python/sglang/srt/managers/tokenizer_manager.py
+++ b/python/sglang/srt/managers/tokenizer_manager.py
@@ -55,6 +55,7 @@ from sglang.srt.managers.embed_types import PositionalEmbeds
 from sglang.srt.managers.io_struct import (
     AbortReq,
     ActiveRanksOutput,
+    BaseBatchReq,
     BaseReq,
     BatchEmbeddingOutput,
     BatchStrOutput,
@@ -383,19 +384,16 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
             context, zmq.PULL, port_args.tokenizer_ipc_name, True
         )
         if self.server_args.tokenizer_worker_num == 1:
-            send_to_scheduler = get_zmq_socket(
+            self.send_to_scheduler = get_zmq_socket(
                 context, zmq.PUSH, port_args.scheduler_input_ipc_name, True
             )
-            self.send_to_scheduler = SenderWrapper(port_args, send_to_scheduler)
+            self.tokenizer_ipc_name = None
         else:
             # Use tokenizer_worker_ipc_name in multi-tokenizer mode
-            send_to_scheduler = get_zmq_socket(
+            self.send_to_scheduler = get_zmq_socket(
                 context, zmq.PUSH, port_args.tokenizer_worker_ipc_name, False
             )
-            # Make sure that each request carries the tokenizer_ipc_name for response routing
-            self.send_to_scheduler = SenderWrapper(
-                port_args, send_to_scheduler, attach_multi_http_worker_info=True
-            )
+            self.tokenizer_ipc_name = port_args.tokenizer_ipc_name
 
         self.load_snapshot_reader = create_load_snapshot_reader(
             self.server_args,
@@ -403,6 +401,16 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
             caller="TokenizerManager",
         )
 
+    def _dispatch_to_scheduler(self, obj: Any) -> None:
+        if self.tokenizer_ipc_name is not None:
+            stamp_http_worker_ipc(obj, self.tokenizer_ipc_name)
+        sock_send(self.send_to_scheduler, obj)
+
+    async def _async_dispatch_to_scheduler(self, obj: Any) -> None:
+        if self.tokenizer_ipc_name is not None:
+            stamp_http_worker_ipc(obj, self.tokenizer_ipc_name)
+        await async_sock_send(self.send_to_scheduler, obj)
+
     def init_running_status(self):
         # Request states
         self.rid_to_state: Dict[str, ReqState] = {}
@@ -599,8 +607,6 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
                     f"routed_dp_rank={obj.routed_dp_rank} out of range [0, {dp_size})"
                 )
 
-        if self.server_args.tokenizer_worker_num > 1:
-            self._attach_multi_http_worker_info(obj)
         self._init_req_state(obj, request)
         try:
             if self.server_args.language_only:
@@ -1192,7 +1198,7 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
             tokenized_obj = TokenizedEmbeddingReqInput(
                 input_text=input_text,
                 input_ids=input_ids_arr,
-                image_inputs=mm_inputs,
+                mm_inputs=mm_inputs,
                 token_type_ids=token_type_ids,
                 sampling_params=sampling_params,
                 positional_embed_overrides=positional_embed_overrides,
@@ -1326,7 +1332,7 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
     ):
         tokenized_obj.time_stats.set_api_server_dispatch_time()
         tokenized_obj = wrap_shm_features(tokenized_obj)
-        sock_send(self.send_to_scheduler, tokenized_obj)
+        self._dispatch_to_scheduler(tokenized_obj)
         tokenized_obj.time_stats.set_api_server_dispatch_finish_time()
 
     def _send_batch_request(
@@ -1342,7 +1348,7 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
             batch_req = BatchTokenizedEmbeddingReqInput(batch=tokenized_objs)
 
         set_time_batch(tokenized_objs, "set_api_server_dispatch_time")
-        sock_send(self.send_to_scheduler, batch_req)
+        self._dispatch_to_scheduler(batch_req)
         set_time_batch(tokenized_objs, "set_api_server_dispatch_finish_time")
 
     def _coalesce_streaming_chunks(
@@ -1561,7 +1567,9 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
             else:
                 # Sequential tokenization and processing
                 with (
-                    input_blocker_guard_region(send_to_scheduler=self.send_to_scheduler)
+                    input_blocker_guard_region(
+                        dispatch_to_scheduler=self._dispatch_to_scheduler,
+                    )
                     if get_bool_env_var("SGLANG_ENABLE_COLOCATED_BATCH_GEN")
                     else nullcontext()
                 ):
@@ -1667,7 +1675,7 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
         ):
             return
         req = AbortReq(rid=rid, abort_all=abort_all)
-        sock_send(self.send_to_scheduler, req)
+        self._dispatch_to_scheduler(req)
         if self.enable_metrics:
             # TODO: also use custom_labels from the request
             self.metrics_collector.observe_one_aborted_request(
@@ -1678,7 +1686,7 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
         async with self.is_pause_cond:
             self.is_pause = True
             if obj.mode != "abort":
-                await async_sock_send(self.send_to_scheduler, obj)
+                await self._async_dispatch_to_scheduler(obj)
             else:
                 # we are using the model_update_lock to check if there is still on-going requests.
                 while True:
@@ -1692,7 +1700,7 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
     async def continue_generation(self, obj: ContinueGenerationReqInput):
         async with self.is_pause_cond:
             self.is_pause = False
-            await async_sock_send(self.send_to_scheduler, obj)
+            await self._async_dispatch_to_scheduler(obj)
             self.is_pause_cond.notify_all()
 
     async def update_weights_from_disk(
@@ -1737,7 +1745,7 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
     async def _wait_for_model_update_from_disk(
         self, obj: UpdateWeightFromDiskReqInput
     ) -> Tuple[bool, str]:
-        sock_send(self.send_to_scheduler, obj)
+        self._dispatch_to_scheduler(obj)
         self.model_update_result = asyncio.Future()
         if self.server_args.dp_size == 1:
             result = await self.model_update_result
@@ -1777,12 +1785,12 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
             # Let the exception propagate to the caller.
             # Only legal requests will be sent to scheduler.
             logging.getLogger().setLevel(obj.log_level.upper())
-            sock_send(self.send_to_scheduler, obj)
+            self._dispatch_to_scheduler(obj)
         logging.info(f"Config logging: {obj=}")
 
     async def freeze_gc(self):
         """Send a freeze_gc message to the scheduler first, then freeze locally."""
-        sock_send(self.send_to_scheduler, FreezeGCReq())
+        self._dispatch_to_scheduler(FreezeGCReq())
         freeze_gc("Tokenizer Manager")
         return None
 
@@ -2652,7 +2660,7 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
             self._subprocess_watchdog.stop()
         # Ask schedulers to release resources in userspace and exit (see
         # ShutdownReq), then wait for them before hard-killing the rest.
-        sock_send(self.send_to_scheduler, ShutdownReq())
+        self._dispatch_to_scheduler(ShutdownReq())
         deadline = time.monotonic() + 15
         while time.monotonic() < deadline and collect_scheduler_processes():
             time.sleep(0.1)
@@ -2721,7 +2729,7 @@ class TokenizerManager(TokenizerControlMixin, TokenizerManagerScoreMixin):
         state.event.set()
 
     def update_active_ranks(self, ranks: ActiveRanksOutput):
-        sock_send(self.send_to_scheduler, ranks)
+        self._dispatch_to_scheduler(ranks)
 
     def _handle_open_session_req_output(self, recv_obj):
         future = self.session_futures.get(recv_obj.session_id)
@@ -3121,23 +3129,8 @@ class SignalHandler:
 #
 
 
-class SenderWrapper:
-    def __init__(
-        self,
-        port_args,
-        send_to_scheduler,
-        attach_multi_http_worker_info=False,
-    ):
-        self.port_args = port_args
-        self.send_to_scheduler = send_to_scheduler
-        self.attach_multi_http_worker_info = attach_multi_http_worker_info
-
-    def _stamp_http_worker_ipc(self, obj):
-        if not self.attach_multi_http_worker_info:
-            return
-        if isinstance(obj, BaseReq):
-            obj.http_worker_ipc = self.port_args.tokenizer_ipc_name
-
-    def send_pyobj(self, obj, flags=0):
-        self._stamp_http_worker_ipc(obj)
-        return self.send_to_scheduler.send_pyobj(obj, flags=flags)
+def stamp_http_worker_ipc(obj: Any, ipc_name: str) -> None:
+    if isinstance(obj, BaseReq):
+        obj.http_worker_ipc = ipc_name
+    elif isinstance(obj, BaseBatchReq):
+        obj.http_worker_ipcs = [ipc_name] * len(obj.rids)