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Malloy MCP Server

@namabile

Repository

Basic information

Category

Other

License

MIT

Transports

stdio

Author

namabile

About Malloy MCP Server

An MCP Server for interacting with Malloy data models through the Malloy Publisher

#malloy#mcp#server

Malloy MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "malloy-mcp-server": {
      "command": "uv",
      "args": [
        "pip",
        "install",
        "malloy-mcp-server"
      ]
    }
  }
}

Malloy MCP Server tools

Tool list not available yet

This listing does not currently have a tool list to display. This does not mean the server has no tools; check its documentation for supported capabilities.

We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.

Overview

What is Malloy MCP Server?

An MCP server implementation for executing Malloy queries and managing Malloy resources. It integrates with the Malloy Publisher API and is intended for developers who need to run Malloy queries via the Model Context Protocol.

How to use Malloy MCP Server?

Install using uv pip install malloy-mcp-server or pip install malloy-mcp-server. Configure the MALLOY_PUBLISHER_ROOT_URL environment variable (default http://localhost:4000). Start the server with mcp.serve() or by running python -m malloy_mcp_server. Use the ExecuteMalloyQueryTool to run queries and access resource endpoints such as malloy://project/home/metadata.

Key features of Malloy MCP Server

  • Execute Malloy queries via MCP
  • Access Malloy project, package, and model metadata
  • Robust error handling with detailed context
  • Comprehensive test coverage
  • Type-safe implementation

Use cases of Malloy MCP Server

  • Execute ad‑hoc Malloy queries through MCP tools
  • Programmatically inspect project, package, or model metadata
  • Integrate Malloy querying into AI‑powered workflows
  • Debug queries with detailed error context

Frequently asked questions

1

How do I install Malloy MCP Server?

Install with `uv pip install malloy-mcp-server` or `pip install malloy-mcp-server`. For development, use `uv pip install -e ".[dev]"`.

2

How do I configure the Malloy Publisher URL?

Set the `MALLOY_PUBLISHER_ROOT_URL` environment variable; it defaults to `http://localhost:4000`.

3

What dependencies does the server use?

The server is built on FastMCP, the Malloy Publisher Client, and Pydantic for data validation.

4

How does error handling work?

The server raises a `QueryExecutionError` with `message` and `context` attributes for detailed error context.

5

Can I run tests?

Yes, run `pytest` or `pytest --cov=malloy_mcp_server` for test coverage.

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