[MCP] Web search returns no output

[dreamnauts]

I'm trying to try MCP web search. MCP server I tried is the one available in Hugging Face Space.
https://huggingface.co/spaces/victor/websearch

My mcp.json is as following:

{
  "servers": {
    "gradio": {
      "transport": "sse",
      "url": "https://victor-websearch.hf.space/gradio_api/mcp/sse",
      "enabled": true,
      "timeout": 60
    }
  },
  "max_tool_calls": 2,
  "default_timeout": 30.0
}

It seems MCP server is recognized and loaded successfully.

2026-03-30 08:41:27,341 - omlx.mcp.client - DEBUG - [-] - Discovered tool: gradio__websearch_search_web
2026-03-30 08:41:27,341 - omlx.mcp.client - INFO - [-] - Connected to MCP server 'gradio' (1 tools available)
2026-03-30 08:41:27,341 - omlx.mcp.manager - INFO - [-] - Connected to 'gradio'
2026-03-30 08:41:27,342 - omlx.mcp.manager - INFO - [-] - MCP manager started: 1/1 servers, 1 tools available
2026-03-30 08:41:27,342 - omlx.server - INFO - [-] - MCP initialized with 1 tools

I learned that chat client needs to support client-side tool execution loop, so I used Open WebUI to test.
And yes, Open WebUI did execute web search. However, it's returning no result.

In the log, content of the tool_calls has no value.

2026-03-30 08:42:53,734 - omlx.server - TRACE - [-] - Incoming POST /v1/chat/completions — body: {"stream": true, "model": "Qwen3.5-9B-MLX-4bit", "messages": [{"role": "user", "content": "Who is the prime minister of Japan now?"}, {"role": "assistant", "content": "<think>\nThe user is asking about the current Prime Minister of Japan. This is a straightforward factual question about current political leadership. Since this is general information (not breaking news or time-sensitive information that would require fresh news search), I should use the general \"search\" mode rather than \"news\" mode.\n\nLet me search for this information to get the most up-to-date answer.\n</think>", "tool_calls": [{"id": "call_c55b32c0", "type": "function", "function": {"name": "gradio__websearch_search_web", "arguments": "{\"num_results\": \"4\", \"query\": \"current prime minister of Japan 2025\", \"search_type\": \"search\"}"}}]}, {"role": "tool", "tool_call_id": "call_c55b32c0", "content": ""}]}

I'm a newbie here, so maybe I'm doing something wrong...
Let me know if the issue is on my setup, the MCP server or an issue on oMLX side. Thanks.