fastmcp.server.tasks.routing

Task routing helper for MCP components. Provides unified task mode enforcement and docket routing logic.

Functions

check_background_task

check_background_task(component: Tool | Resource | ResourceTemplate | Prompt, task_type: TaskType, arguments: dict[str, Any] | None = None, task_meta: TaskMeta | None = None) -> mcp.types.CreateTaskResult | None

Check task mode and submit to background if requested.

Args:

  • component: The MCP component
  • task_type: Type of task (“tool”, “resource”, “template”, “prompt”)
  • arguments: Arguments for tool/prompt/template execution
  • task_meta: Task execution metadata. If provided, execute as background task.

Returns:

  • CreateTaskResult if submitted to docket, None for sync execution

Raises:

  • McpError: If mode=“required” but no task metadata, or mode=“forbidden” but task metadata is present.