feat(python/omp-rpc): added blocker field and blocked status to todo items

- Add blocked todo status and optional blocker attribute to todo items.
- Update RPC client and worker serialization logic to support todo blockers.
- Add test coverage for parsing session state with blocked todos.

python/omp-rpc/src/omp_rpc/client.py

@@ -1673,6 +1673,7 @@ class RpcClient:
                     "status": cast(JsonValue, seed.status),
                     "notes": seed.notes,
                     "details": seed.details,
+                    "blocker": seed.blocker,
                 }
 
             content = seed.get("content")
@@ -1683,6 +1684,7 @@ class RpcClient:
             raw_status = seed.get("status")
             raw_notes = seed.get("notes")
             raw_details = seed.get("details")
+            raw_blocker = seed.get("blocker")
             if isinstance(raw_status, str):
                 if raw_status not in _TODO_STATUS_VALUES:
                     raise RpcError(f"Unsupported todo status: {raw_status}")
@@ -1697,6 +1699,7 @@ class RpcClient:
                 "status": cast(JsonValue, status),
                 "notes": raw_notes if isinstance(raw_notes, str) else None,
                 "details": raw_details if isinstance(raw_details, str) else None,
+                "blocker": raw_blocker if isinstance(raw_blocker, str) else None,
             }
 
         def is_phase_seed(seed: TodoSeed | TodoPhaseSeed) -> bool:

python/omp-rpc/src/omp_rpc/protocol.py

@@ -21,7 +21,9 @@ InterruptMode: TypeAlias = Literal["immediate", "wait"]
 StopReason: TypeAlias = Literal["stop", "length", "toolUse", "error", "aborted"]
 NotifyType: TypeAlias = Literal["info", "warning", "error"]
 WidgetPlacement: TypeAlias = Literal["aboveEditor", "belowEditor"]
-TodoStatus: TypeAlias = Literal["pending", "in_progress", "completed", "abandoned"]
+TodoStatus: TypeAlias = Literal[
+    "pending", "in_progress", "completed", "abandoned", "blocked"
+]
 ExtensionUiMethod: TypeAlias = Literal[
     "select",
     "confirm",
@@ -65,7 +67,7 @@ _WIDGET_PLACEMENT_VALUES: Final[frozenset[str]] = frozenset(
     {"aboveEditor", "belowEditor"}
 )
 _TODO_STATUS_VALUES: Final[frozenset[str]] = frozenset(
-    {"pending", "in_progress", "completed", "abandoned"}
+    {"pending", "in_progress", "completed", "abandoned", "blocked"}
 )
 _EXTENSION_UI_METHOD_VALUES: Final[frozenset[str]] = frozenset(
     {
@@ -745,6 +747,8 @@ class TodoItem:
     status: TodoStatus
     notes: str | None = None
     details: str | None = None
+    # What a `blocked` task is waiting on; None for all other statuses.
+    blocker: str | None = None
 
 
 @dataclass(slots=True, frozen=True)
@@ -1260,6 +1264,7 @@ def parse_todo_item(payload: JsonObject) -> TodoItem:
         ),
         notes=_optional_str(payload, "notes"),
         details=_optional_str(payload, "details"),
+        blocker=_optional_str(payload, "blocker"),
     )
 
 

python/omp-rpc/tests/test_protocol.py

@@ -176,6 +176,37 @@ class ProtocolParsingTests(unittest.TestCase):
         self.assertEqual(notification.todos[0].content, "Map tools")
         self.assertEqual(notification.todos[0].status, "pending")
 
+    def test_parse_session_state_accepts_blocked_todo(self) -> None:
+        # Regression: the TS agent added a `blocked` todo status (with a
+        # `blocker` note); resuming a session whose todos were blocked must
+        # not fail state parsing.
+        state = parse_session_state(
+            {
+                "sessionId": "session-123",
+                "steeringMode": "one-at-a-time",
+                "followUpMode": "one-at-a-time",
+                "interruptMode": "immediate",
+                "todoPhases": [
+                    {
+                        "id": "phase-1",
+                        "name": "Fix",
+                        "tasks": [
+                            {
+                                "id": "task-1",
+                                "content": "Open PR",
+                                "status": "blocked",
+                                "blocker": "waiting on maintainer go-ahead",
+                            }
+                        ],
+                    }
+                ],
+            }
+        )
+
+        task = state.todo_phases[0].tasks[0]
+        self.assertEqual(task.status, "blocked")
+        self.assertEqual(task.blocker, "waiting on maintainer go-ahead")
+
     def test_assistant_text_excludes_thinking_by_default(self) -> None:
         message = {
             "role": "assistant",