MCP Server Airflow Token

Instructions

Implementation Reference

• src/airflow/dag.py:123-140 (handler)

  The main handler function that implements the 'patch_dag' tool. It constructs an update request for optional fields 'is_paused' and 'tags', creates a DAG model instance, and calls the Airflow DAG API to patch the specified DAG.

  async def patch_dag(
      dag_id: str, is_paused: Optional[bool] = None, tags: Optional[List[str]] = None
  ) -> List[Union[types.TextContent, types.ImageContent, types.EmbeddedResource]]:
      update_request = {}
      update_mask = []
  
      if is_paused is not None:
          update_request["is_paused"] = is_paused
          update_mask.append("is_paused")
      if tags is not None:
          update_request["tags"] = tags
          update_mask.append("tags")
  
      dag = DAG(**update_request)
  
      response = dag_api.patch_dag(dag_id=dag_id, dag=dag, update_mask=update_mask)
      return [types.TextContent(type="text", text=str(response.to_dict()))]

• src/airflow/dag.py:15-33 (registration)

  The get_all_functions() returns a list of tuples for registering all DAG-related tools, including the 'patch_dag' tool with name 'patch_dag', description 'Update a DAG', and is_read_only=False.

  def get_all_functions() -> list[tuple[Callable, str, str, bool]]:
      """Return list of (function, name, description, is_read_only) tuples for registration."""
      return [
          (get_dags, "fetch_dags", "Fetch all DAGs", True),
          (get_dag, "get_dag", "Get a DAG by ID", True),
          (get_dag_details, "get_dag_details", "Get a simplified representation of DAG", True),
          (get_dag_source, "get_dag_source", "Get a source code", True),
          (pause_dag, "pause_dag", "Pause a DAG by ID", False),
          (unpause_dag, "unpause_dag", "Unpause a DAG by ID", False),
          (get_dag_tasks, "get_dag_tasks", "Get tasks for DAG", True),
          (get_task, "get_task", "Get a task by ID", True),
          (get_tasks, "get_tasks", "Get tasks for DAG", True),
          (patch_dag, "patch_dag", "Update a DAG", False),
          (patch_dags, "patch_dags", "Update multiple DAGs", False),
          (delete_dag, "delete_dag", "Delete a DAG", False),
          (clear_task_instances, "clear_task_instances", "Clear a set of task instances", False),
          (set_task_instances_state, "set_task_instances_state", "Set a state of task instances", False),
          (reparse_dag_file, "reparse_dag_file", "Request re-parsing of a DAG file", False),
      ]