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[GH-ISSUE #16796] issue: MCPO Tools Missing #33575
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Reference: github-starred/open-webui#33575
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Originally created by @cma2t3r on GitHub (Aug 21, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/16796
Check Existing Issues
Installation Method
Docker
Open WebUI Version
v0.6.23
Ollama Version (if applicable)
No response
Operating System
Ubuntu
Browser (if applicable)
Chrome
Confirmation
README.md.Expected Behavior
Use chat with attached MCP Tools
Actual Behavior
MCP Tools are missing from all models in the Workspace
Steps to Reproduce
Logs & Screenshots
Docker / Open-Webui log:
2025-08-21 21:16:15.501 | INFO | open_webui.utils.tools:get_tool_server_data:541 - Fetched data: {'openapi': {'openapi': '3.1.0', 'info': {'title': 'ddg-search', 'description': 'ddg-search MCP Server', 'version': '1.3.0'}, 'servers': [{'url': '/duckduckgo'}], 'paths': {'/search': {'post': {'summary': 'Search', 'description': 'Search DuckDuckGo and return formatted results.\n\nArgs:\n query: The search query string\n max_results: Maximum number of results to return (default: 10)\n ctx: MCP context for logging', 'operationId': 'tool_search_post', 'requestBody': {'content': {'application/json': {'schema': {'$ref': '#/components/schemas/search_form_model'}}}, 'required': True}, 'responses': {'200': {'description': 'Successful Response', 'content': {'application/json': {'schema': {'title': 'Response Tool Search Post'}}}}, '422': {'description': 'Validation Error', 'content': {'application/json': {'schema': {'$ref': '#/components/schemas/HTTPValidationError'}}}}}}}, '/fetch_content': {'post': {'summary': 'Fetch Content', 'description': 'Fetch and parse content from a webpage URL.\n\nArgs:\n url: The webpage URL to fetch content from\n ctx: MCP context for logging', 'operationId': 'tool_fetch_content_post', 'requestBody': {'content': {'application/json': {'schema': {'$ref': '#/components/schemas/fetch_content_form_model'}}}, 'required': True}, 'responses': {'200': {'description': 'Successful Response', 'content': {'application/json': {'schema': {'title': 'Response Tool Fetch Content Post'}}}}, '422': {'description': 'Validation Error', 'content': {'application/json': {'schema': {'$ref': '#/components/schemas/HTTPValidationError'}}}}}}}}, 'components': {'schemas': {'HTTPValidationError': {'properties': {'detail': {'items': {'$ref': '#/components/schemas/ValidationError'}, 'type': 'array', 'title': 'Detail'}}, 'type': 'object', 'title': 'HTTPValidationError'}, 'ValidationError': {'properties': {'loc': {'items': {'anyOf': [{'type': 'string'}, {'type': 'integer'}]}, 'type': 'array', 'title': 'Location'}, 'msg': {'type': 'string', 'title': 'Message'}, 'type': {'type': 'string', 'title': 'Error Type'}}, 'type': 'object', 'required': ['loc', 'msg', 'type'], 'title': 'ValidationError'}, 'fetch_content_form_model': {'properties': {'url': {'type': 'string', 'title': 'Url', 'description': ''}}, 'type': 'object', 'required': ['url'], 'title': 'fetch_content_form_model'}, 'search_form_model': {'properties': {'query': {'type': 'string', 'title': 'Query', 'description': ''}, 'max_results': {'type': 'integer', 'title': 'Max Results', 'description': '', 'default': 10}}, 'type': 'object', 'required': ['query'], 'title': 'search_form_model'}}}}, 'info': {'title': 'ddg-search', 'description': 'ddg-search MCP Server', 'version': '1.3.0'}, 'specs': [{'name': 'tool_search_post', 'description': 'Search DuckDuckGo and return formatted results.\n\nArgs:\n query: The search query string\n max_results: Maximum number of results to return (default: 10)\n ctx: MCP context for logging', 'parameters': {'type': 'object', 'properties': {'query': {'type': 'string', 'title': 'Query', 'description': ''}, 'max_results': {'type': 'integer', 'title': 'Max Results', 'description': '', 'default': 10}}, 'required': ['query']}}, {'name': 'tool_fetch_content_post', 'description': 'Fetch and parse content from a webpage URL.\n\nArgs:\n url: The webpage URL to fetch content from\n ctx: MCP context for logging', 'parameters': {'type': 'object', 'properties': {'url': {'type': 'string', 'title': 'Url', 'description': ''}}, 'required': ['url']}}]}
Browser console:
/admin/settings/tools:1 Uncaught (in promise) Error: A listener indicated an asynchronous response by returning true, but the message channel closed before a response was received
Additional Information
No response
@vk2r commented on GitHub (Aug 21, 2025):
I can't believe they overlooked this. This is the only way to use MCP, and they've screwed it up.
The way I see it, they should leave MCPO behind and migrate directly to MCP.
The more tools they have to maintain, the worse the maintainability.
@cma2t3r commented on GitHub (Aug 21, 2025):
MCPO is useful for those cases where the MCP Tool traffic needs to originate in a specific node to access an isolated/restricted resource.
@JHawx79 commented on GitHub (Aug 21, 2025):
Not sure if YouTube transcript tool is related, but that isn't working for me either.
@jhemmond commented on GitHub (Aug 22, 2025):
Time to downgrade until this is figured out. Big feature to miss..
@papajbeautiful commented on GitHub (Aug 22, 2025):
+1
No tool servers available in models after upgrade.
@zhangruicn commented on GitHub (Aug 22, 2025):
In the past, when the MCP tool stopped working, simply restarting it resolved the issue. However, this time, even after deleting and re-adding it, the problem persists.
@healdgar commented on GitHub (Aug 22, 2025):
Same issue, the + button in chat doesn't bring up enabled tools anymore either.
@tjbck commented on GitHub (Aug 22, 2025):
#16803