fix session routing and subagent visibility

src/agent_runtime.py

@@ -282,6 +282,7 @@ class LocalCodingAgent:
     managed_group_id: str | None = None
     managed_child_index: int | None = None
     managed_label: str | None = None
+    session_metadata: dict[str, object] = field(default_factory=dict)
     plugin_runtime: PluginRuntime | None = None
     hook_policy_runtime: HookPolicyRuntime | None = None
     mcp_runtime: MCPRuntime | None = None
@@ -3445,6 +3446,15 @@ class LocalCodingAgent:
             managed_group_id=group_id,
             managed_child_index=index,
             managed_label=subtask_label,
+            session_metadata={
+                'visibility': 'child',
+                'parent_session_id': self.active_session_id or '',
+                'subagent_type': agent_def.agent_type,
+                'delegate_label': subtask_label,
+                'delegate_index': index,
+                'delegate_batch_index': batch_index,
+                **({'delegate_group_id': group_id} if group_id is not None else {}),
+            },
         )
         if self.tool_context.jupyter_runtime is not None:
             child_agent.tool_context = replace(
@@ -4242,6 +4252,7 @@ class LocalCodingAgent:
                 else {}
             ),
             scratchpad_directory=result.scratchpad_directory,
+            session_metadata=dict(self.session_metadata),
         )
         path = save_agent_session(
             stored,

src/session_store.py

@@ -69,6 +69,7 @@ class StoredAgentSession:
     plugin_state: JSONDict
     scratchpad_directory: str | None = None
     is_training: bool = False
+    session_metadata: JSONDict | None = None
 
 
 def save_agent_session(session: StoredAgentSession, directory: Path | None = None) -> Path:
@@ -120,6 +121,11 @@ def load_agent_session(session_id: str, directory: Path | None = None) -> Stored
             else None
         ),
         is_training=bool(data.get('is_training', False)),
+        session_metadata=(
+            dict(data.get('session_metadata', {}))
+            if isinstance(data.get('session_metadata'), dict)
+            else {}
+        ),
     )