MCP-Airflow-API

Instructions

Implementation Reference

• src/mcp_airflow_api/tools/common_tools.py:745-750 (handler)

  Core handler function decorated with @mcp.tool(). Fetches detailed task instance information from the Airflow REST API endpoint.

  @mcp.tool()
  async def get_task_instance_details(dag_id: str, dag_run_id: str, task_id: str) -> Dict[str, Any]:
      """[Tool Role]: Gets detailed information for a specific task instance."""
      resp = await airflow_request("GET", f"/dags/{dag_id}/dagRuns/{dag_run_id}/taskInstances/{task_id}")
      resp.raise_for_status()
      return resp.json()

• src/mcp_airflow_api/tools/common_tools.py:21-27 (registration)

  The registration function where all common tools, including get_task_instance_details, are defined as nested functions decorated with @mcp.tool() and thus registered to the MCP server instance.

  def register_common_tools(mcp):
      """Register all 43 common tools that work with both v1 and v2 APIs."""
      
      if airflow_request is None:
          raise RuntimeError("airflow_request function must be set before registering common tools")
      
      logger.info("Registering common tools shared between v1 and v2")

• src/mcp_airflow_api/tools/v1_tools.py:13-27 (registration)

  v1-specific registration entry point that configures the airflow_request for v1 API and invokes common_tools registration.

  def register_tools(mcp):
      """Register v1 tools by importing common tools with v1 request function."""
      
      logger.info("Initializing MCP server for Airflow API v1")
      logger.info("Loading Airflow API v1 tools (Airflow 2.x)")
      
      # Set the global request function to v1
      common_tools.airflow_request = airflow_request_v1
      
      # Register all 56 common tools (includes management tools)
      common_tools.register_common_tools(mcp)
      
      # V1 has no exclusive tools - all tools are shared with v2
      
      logger.info("Registered all Airflow API v1 tools (56 tools: 43 core + 13 management tools)")

• src/mcp_airflow_api/tools/v2_tools.py:14-103 (registration)

  v2-specific registration entry point that configures the airflow_request for v2 API and invokes common_tools registration, plus adds v2-exclusive tools.

  def register_tools(mcp):
      """Register v2 tools: common tools + v2-exclusive asset tools."""
      
      logger.info("Initializing MCP server for Airflow API v2")
      logger.info("Loading Airflow API v2 tools (Airflow 3.0+)")
      
      # Set the global request function to v2
      common_tools.airflow_request = airflow_request_v2
      
      # Register all 43 common tools
      common_tools.register_common_tools(mcp)
      
      # Add V2-exclusive tools (2 tools)
      @mcp.tool()
      async def list_assets(limit: int = 20, offset: int = 0,
                           uri_pattern: Optional[str] = None) -> Dict[str, Any]:
          """
          [V2 New] List all assets in the system for data-aware scheduling.
          
          Assets are a key feature in Airflow 3.0 for data-aware scheduling.
          They enable workflows to be triggered by data changes rather than time schedules.
          
          Args:
              limit: Maximum number of assets to return (default: 20)
              offset: Number of assets to skip for pagination (default: 0)
              uri_pattern: Filter assets by URI pattern (optional)
              
          Returns:
              Dict containing assets list, pagination info, and metadata
          """
          params = {'limit': limit, 'offset': offset}
          if uri_pattern:
              params['uri_pattern'] = uri_pattern
              
          query_string = "&".join([f"{k}={v}" for k, v in params.items()])
          
          resp = await airflow_request_v2("GET", f"/assets?{query_string}")
          resp.raise_for_status()
          data = resp.json()
          
          return {
              "assets": data.get("assets", []),
              "total_entries": data.get("total_entries", 0),
              "limit": limit,
              "offset": offset,
              "api_version": "v2",
              "feature": "assets"
          }
  
      @mcp.tool()
      async def list_asset_events(limit: int = 20, offset: int = 0,
                                 asset_uri: Optional[str] = None,
                                 source_dag_id: Optional[str] = None) -> Dict[str, Any]:
          """
          [V2 New] List asset events for data lineage tracking.
          
          Asset events track when assets are created or updated by DAGs.
          This enables data lineage tracking and data-aware scheduling in Airflow 3.0.
          
          Args:
              limit: Maximum number of events to return (default: 20)
              offset: Number of events to skip for pagination (default: 0)
              asset_uri: Filter events by specific asset URI (optional)
              source_dag_id: Filter events by source DAG that produced the event (optional)
              
          Returns:
              Dict containing asset events list, pagination info, and metadata
          """
          params = {'limit': limit, 'offset': offset}
          if asset_uri:
              params['asset_uri'] = asset_uri
          if source_dag_id:
              params['source_dag_id'] = source_dag_id
              
          query_string = "&".join([f"{k}={v}" for k, v in params.items()])
          
          resp = await airflow_request_v2("GET", f"/assets/events?{query_string}")
          resp.raise_for_status()
          data = resp.json()
          
          return {
              "asset_events": data.get("asset_events", []),
              "total_entries": data.get("total_entries", 0),
              "limit": limit,
              "offset": offset,
              "api_version": "v2",
              "feature": "asset_events"
          }
  
      logger.info("Registered all Airflow API v2 tools (43 common + 2 assets + 4 management = 49 tools)")

• src/mcp_airflow_api/mcp_main.py:264-271 (registration)

  Main server creation function that conditionally imports and calls v1_tools.register_tools or v2_tools.register_tools based on detected Airflow API version, thereby registering the tool.

      logger.info("Loading Airflow API v1 tools (Airflow 2.x)")
      from mcp_airflow_api.tools import v1_tools
      v1_tools.register_tools(mcp_instance)
  elif api_version == "v2":
      logger.info("Loading Airflow API v2 tools (Airflow 3.0+)")
      from mcp_airflow_api.tools import v2_tools
      v2_tools.register_tools(mcp_instance)
  else: