Xzar MCP Server: Install & Setup

Install Xzar in Claude Code

Remote URL

Claude Code

claude mcp add --transport http xzar https://api.xzar.si/mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "xzar": {
      "url": "https://api.xzar.si/mcp"
    }
  }
}

PyPI (uv)

Claude Code

claude mcp add xzar -e XZAR_API_KEY=... -- uvx xzar-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "xzar": {
      "command": "uvx",
      "args": [
        "xzar-mcp"
      ],
      "env": {
        "XZAR_API_KEY": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the Xzar MCP server do?

Crash-test your AI agent on real professional decisions, graded against what actually happened.

Is the Xzar MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does Xzar run locally or remotely?

Local + Remote. Can run locally or be used as a hosted remote server.

How do I add Xzar to Claude Code?

Run: claude mcp add --transport http xzar https://api.xzar.si/mcp

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