Fix mypy errors in CI

Author: KoolADE85

dash/background_callback/managers/diskcache_manager.py

@@ -36,7 +36,7 @@ def __init__(self, cache=None, cache_by=None, expire=None):
             is determined by the default behavior of the ``cache`` instance.
         """
         try:
-            import diskcache  # type: ignore[import-not-found] # pylint: disable=import-outside-toplevel
+            import diskcache  # type: ignore[import-not-found,import-untyped] # pylint: disable=import-outside-toplevel
             import psutil  # type: ignore[import-untyped] # noqa: F401,E402 pylint: disable=import-outside-toplevel,unused-import,unused-variable,import-error
             import multiprocess  # type: ignore[import-untyped] # noqa: F401,E402 pylint: disable=import-outside-toplevel,unused-import,unused-variable
         except ImportError as missing_imports:

dash/mcp/primitives/tools/tools_callbacks.py

@@ -59,7 +59,7 @@ def call_tool(
             )
 
         if is_background:
-            task_result = create_task(callback_response, cb)
+            task_result = create_task(dict(callback_response), cb)
             if task is not None:
                 return task_result
             return task_result_to_tool_result(task_result)

dash/mcp/tasks/tasks.py

@@ -4,7 +4,7 @@
 
 import json
 from datetime import datetime, timezone
-from typing import Any
+from typing import Any, Literal
 
 from mcp.types import CancelTaskResult, CreateTaskResult, GetTaskResult, Task
 
@@ -15,7 +15,8 @@
 
 def parse_task_id(task_id: str) -> tuple[str, str, str]:
     """Parse a taskId into (tool_name, job_id, cache_key)."""
-    return task_id.split(":", 2)
+    tool_name, job_id, cache_key = task_id.split(":", 2)
+    return tool_name, job_id, cache_key
 
 
 def _get_callback_manager():
@@ -66,6 +67,7 @@ def get_task(task_id: str) -> GetTaskResult:
     running = manager.job_running(job_id)
     progress = manager.get_progress(cache_key)
 
+    status: Literal["working", "completed", "failed"]
     if running:
         status = "working"
     elif manager.result_ready(cache_key):