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66aaf420c9* Implement MCP background tasks (SEP-1686) using Docket Adds support for background task execution via the MCP task protocol, powered by Docket for task queue management. - Tools, resources, and prompts can be marked with `task=True` to run async - Progress dependency for tracking task progress - CurrentDocket and CurrentWorker dependencies for advanced use cases - Client API with `.call_tool(..., task=True)` returns task handles - Task status notifications via subscriptions - CLI worker command for distributed task processing Configuration via environment: - FASTMCP_ENABLE_DOCKET=true - FASTMCP_ENABLE_TASKS=true - FASTMCP_DOCKET_URL=redis://... (or memory:// for single-process) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> * Fix tasks example import (TaskStatusResponse → GetTaskResult) The example was using a non-existent TaskStatusResponse type. Updated to use mcp.types.GetTaskResult which is what the on_status_change callback actually receives. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> * Fix env var name in Docket error messages The error messages referenced FASTMCP_EXPERIMENTAL_ENABLE_DOCKET but the actual setting is FASTMCP_ENABLE_DOCKET. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> * Remove deprecated code re-added from pre-#2329 branch - Remove ExtendedEnvSettingsSource (FASTMCP_SERVER_ prefix support) - Remove dependencies parameter from FastMCP.__init__ * Replace fakeredis git pin with PyPI release * Remove redundant fakeredis dev dep (pulled via pydocket) --------- Co-authored-by: Claude <noreply@anthropic.com> Co-authored-by: Jeremiah Lowin <153965+jlowin@users.noreply.github.com>
103 lines
3.2 KiB
Python
103 lines
3.2 KiB
Python
"""
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Tests for server-side tool task behavior.
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Tests tool-specific task handling, parallel to test_task_prompts.py
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and test_task_resources.py.
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"""
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import asyncio
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import pytest
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from fastmcp import FastMCP
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from fastmcp.client import Client
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@pytest.fixture
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async def tool_server():
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"""Create a FastMCP server with task-enabled tools."""
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mcp = FastMCP("tool-task-server")
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@mcp.tool(task=True)
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async def simple_tool(message: str) -> str:
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"""A simple tool for testing."""
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return f"Processed: {message}"
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@mcp.tool(task=False)
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async def sync_only_tool(message: str) -> str:
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"""Tool with task=False."""
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return f"Sync: {message}"
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return mcp
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async def test_synchronous_tool_call_unchanged(tool_server):
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"""Tools without task metadata execute synchronously as before."""
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async with Client(tool_server) as client:
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# Regular call without task metadata
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result = await client.call_tool("simple_tool", {"message": "hello"})
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# Should execute immediately and return result
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assert "Processed: hello" in str(result)
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async def test_tool_with_task_metadata_returns_immediately(tool_server):
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"""Tools with task metadata return immediately with ToolTask object."""
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async with Client(tool_server) as client:
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# Call with task metadata
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task = await client.call_tool("simple_tool", {"message": "test"}, task=True)
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assert task
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assert not task.returned_immediately
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from fastmcp.client.client import ToolTask
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assert isinstance(task, ToolTask)
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assert isinstance(task.task_id, str)
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assert len(task.task_id) > 0
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async def test_tool_task_executes_in_background(tool_server):
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"""Tool task is submitted to Docket and executes in background."""
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execution_started = asyncio.Event()
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execution_completed = asyncio.Event()
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@tool_server.tool(task=True)
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async def coordinated_tool() -> str:
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"""Tool with coordination points."""
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execution_started.set()
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await execution_completed.wait()
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return "completed"
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async with Client(tool_server) as client:
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task = await client.call_tool("coordinated_tool", task=True)
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assert task
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assert not task.returned_immediately
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# Wait for execution to start
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await asyncio.wait_for(execution_started.wait(), timeout=2.0)
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# Task should still be working
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status = await task.status()
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assert status.status in ["working"]
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# Signal completion
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execution_completed.set()
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await task.wait(timeout=2.0)
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result = await task.result()
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assert result.data == "completed"
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async def test_graceful_degradation_tool_without_task_flag(tool_server):
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"""Tools with task=False execute synchronously even with task metadata."""
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async with Client(tool_server) as client:
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# Try to call with task metadata - server should execute synchronously
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task = await client.call_tool("sync_only_tool", {"message": "test"}, task=True)
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assert task
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assert task.returned_immediately
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result = await task.result()
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assert "Sync: test" in str(result)
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status = await task.status()
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assert status.status == "completed"
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