config: the runner and scheduler read resolved config from the bags (#34095)

python/sglang/srt/runtime_context.py

@@ -1553,3 +1553,18 @@ def configured_moe_dp_size() -> int:
 
 def configured_attn_cp_size() -> int:
     return _configured_parallel("attn_cp_size")
+
+
+def is_ep_joiner() -> bool:
+    """True in a process launched as an elastic-EP joiner (scale or recover).
+
+    A predicate over the published ``exec.moe.ep_join_mode`` leaf, so it follows
+    a post-publish override; the same-named ``ServerArgs`` property is the
+    pre-publish equivalent.
+    """
+    return get_exec().moe.ep_join_mode in ("scale", "recover")
+
+
+def is_ep_scale_joiner() -> bool:
+    """True in a process launched as an elastic-EP scale-up joiner."""
+    return get_exec().moe.ep_join_mode == "scale"