x-search-mcp

Minimal MCP server for xAI X search using the Responses API and structured outputs.

Features

• Single MCP tool: x_search

• Uses xAI Responses API with x_search tool calling

• Structured output parsing + citation normalization

Related MCP server: x-mcp-server

Requirements

• Node.js >= 18

• XAI_API_KEY environment variable

MCP client config

Add the following config to your MCP client:

{
  "mcpServers": {
    "x-search": {
      "command": "npx",
      "args": ["-y", "x-search-mcp"],
      "env": {
        "XAI_API_KEY": "your-key-here"
      }
    }
  }
}

Local development

npm install
npm run build

Smoke test (optional)

XAI_API_KEY=your-key-here npm run build
XAI_API_KEY=your-key-here npm run smoke-test

Note: this test requires network access and may fail in restricted environments.

MCP Tool

x_search

Searches X with optional filters.

Input

{
  "query": "string",
  "allowed_x_handles": ["string"],
  "excluded_x_handles": ["string"],
  "from_date": "YYYY-MM-DD",
  "to_date": "YYYY-MM-DD",
  "enable_image_understanding": true,
  "enable_video_understanding": true,
  "include_raw_response": false
}

Output

{
  "answer": "string",
  "citations": ["https://x.com/..."],
  "inline_citations": [
    {
      "url": "https://x.com/...",
      "start_index": 10,
      "end_index": 42,
      "title": "1"
    }
  ],
  "raw_response": {}
}

Environment Variables

• XAI_API_KEY (required)

• XAI_MODEL (default: grok-4-1-fast)

• XAI_BASE_URL (default: https://api.x.ai/v1)

• XAI_TIMEOUT (default: 30000)

Notes

• allowed_x_handles and excluded_x_handles are mutually exclusive.

• Date filters must be YYYY-MM-DD and from_date must be <= to_date.

• Tool responses are returned as MCP structuredContent (with a text fallback for display).

• Citations are normalized from xAI response annotations when available.