Skip to main content

​
fastmcp.server.tasks.config

TaskConfig for MCP SEP-1686 background task execution modes. This module defines the configuration for how tools, resources, and prompts handle task-augmented execution as specified in SEP-1686.

​
Classes

​
TaskConfig

Configuration for MCP background task execution (SEP-1686). Controls how a component handles task-augmented requests:
  • “forbidden”: Component does not support task execution. Clients must not request task augmentation; server returns -32601 if they do.
  • “optional”: Component supports both synchronous and task execution. Client may request task augmentation or call normally.
  • “required”: Component requires task execution. Clients must request task augmentation; server returns -32601 if they don’t.
Methods:

​
from_bool 

from_bool(cls, value: bool) -> TaskConfig
Convert boolean task flag to TaskConfig. Args:
  • value: True for “optional” mode, False for “forbidden” mode.
Returns:
  • TaskConfig with appropriate mode.

​
validate_function 

validate_function(self, fn: Callable[..., Any], name: str) -> None
Validate that function is compatible with this task config. Task execution requires async functions. Raises ValueError if mode is “optional” or “required” but function is synchronous. Args:
  • fn: The function to validate (handles callable classes and staticmethods).
  • name: Name for error messages.
Raises:
  • ValueError: If task execution is enabled but function is sync.