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fix: MCP tool calls ignore AIOHTTP_CLIENT_TIMEOUT_TOOL_SERVER (#31641)

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A tool call to an MCP server had no time limit, so a server that hung kept the chat waiting until a reverse proxy or the server itself closed the connection, even with AIOHTTP_CLIENT_TIMEOUT_TOOL_SERVER set. The call now stops after the configured number of seconds and the model sees the timeout as a tool error, which is how OpenAPI tool servers already behave. When the variable is unset it falls back to AIOHTTP_CLIENT_TIMEOUT, and with neither set (or a value of 0 or below) MCP tool calls still have no time limit.

Fixes #31640
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Classic298 2026-09-30 17:00:20 +02:00 • committed by GitHub
parent 3819dc2793
commit c1f245845c
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1 changed files with 6 additions and 1 deletions
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7
backend/open_webui/utils/mcp/client.py
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@ -1,6 +1,7 @@
import asyncio
import logging
from contextlib import AsyncExitStack
from datetime import timedelta
from typing import Optional
log = logging.getLogger(__name__)
@ -116,7 +117,11 @@ class MCPClient:
if not self.session:
raise RuntimeError('MCP client is not connected.')
result = await self.session.call_tool(function_name, function_args)
tool_call_timeout = None
if AIOHTTP_CLIENT_TIMEOUT_TOOL_SERVER is not None and AIOHTTP_CLIENT_TIMEOUT_TOOL_SERVER > 0:
tool_call_timeout = timedelta(seconds=AIOHTTP_CLIENT_TIMEOUT_TOOL_SERVER)
result = await self.session.call_tool(function_name, function_args, read_timeout_seconds=tool_call_timeout)
if not result:
raise Exception('No result returned from MCP tool call.')