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Claude Desktop Fatstack json-schema-validate__json_schema_validate

How to: Claude Desktop Fatstack json-schema-validate__json_schema_validate

client:Claude Desktop transport:streamable-http tool:json-schema-validate__json_schema_validate

Add Fatstack to Claude Desktop

  1. 01

    Open ~/Library/Application Support/Claude/claude_desktop_config.json and merge this in. Keep any servers already there. 

{
  "mcpServers": {
    "registry": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://www.fatstack.net/api/mcp"
      ]
    }
  }
}
  1. 02

    Save the file and restart Claude Desktop.

  2. 03

    Ask for something json-schema-validate__json_schema_validate does. Claude Desktop lists the server's tools on connect and calls json-schema-validate__json_schema_validate itself — you do not invoke it by name.

  3. 04

    If nothing happens, check the server is running and that Fatstack's identifier in your config matches the one above exactly.

Claude Desktop has no remote transport in its config file, so this bridges through mcp-remote. Restart the app after saving. Claude Desktop docs

Same tool, other clients

This list was read from the server itself, by connecting to it and calling tools/list on 24 September 2026. It is what the server actually exposes, not what its listing claims.

Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.

Fatstack MCP server