@huggingface/mcp-client

Client for the Model Context Protocol (MCP).

This package provides a client implementation for interacting with MCP servers, built on top of our InferenceClient, @huggingface/inference.

It includes an example CLI smol Agent that can leverage MCP tools.

Installation

This package is part of the Hugging Face JS monorepo. To install dependencies for all packages, run from the root of the repository:

pnpm install

Usage (CLI Agent)

The package includes a command-line interface (CLI) agent that demonstrates how to use the MCP client.

Prerequisites

• Hugging Face API Token: You need a Hugging Face API token with appropriate permissions. Set it as an environment variable:

  export HF_TOKEN="hf_..."

Running the Agent

Navigate to the package directory and run the agent script:

cd packages/mcp-client
pnpm agent

Alternatively, run from the root of the monorepo:

pnpm --filter @huggingface/mcp-client agent

The agent will load available MCP tools (by default, connecting to a filesystem server for your Desktop and a Playwright server) and prompt you for input (>).

Configuration (Environment Variables)

• HF_TOKEN (Optional): Your Hugging Face API token. Required if you use an Inference Provider on HF.
• MODEL_ID (Optional): The model ID to use for the agent's inference. Defaults to Qwen/Qwen2.5-72B-Instruct.
• PROVIDER (Optional): The inference provider. Defaults to together. See @huggingface/inference for available providers.
• ENDPOINT_URL or BASE_URL (Optional): A custom base URL (local for instance) to call.

Example with custom model:

export HF_TOKEN="hf_..."
export MODEL_ID="Qwen/Qwen2.5-72B-Instruct"
pnpm agent

Development

Common development tasks can be run using pnpm scripts:

• pnpm build: Build the package.
• pnpm lint: Lint and fix code style.
• pnpm format: Format code using Prettier.
• pnpm test: Run tests using Vitest.
• pnpm check: Type-check the code using TypeScript.

License

MIT