jac-mcp 0.1.24

MCP server for AI-assisted Jac development

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jac-mcp : MCP Server for AI-Assisted Jac Development

jac-mcp is a plugin for the Jac language that provides a Model Context Protocol server, giving AI assistants deep knowledge of Jac. It exposes grammar specifications, documentation, code examples, compiler tools, and prompt templates through a standardized protocol -- so any MCP-compatible AI client can write, validate, format, and debug Jac code.

Installation

jac-mcp is a plugin that runs on top of the jac binary, which provides the jaclang runtime. Install the binary first (see the installation guide), then add the plugin:

jac install jac-mcp

jaclang is provided by the jac binary at runtime (a host dependency); it is not pulled from PyPI.

Quick Start

Start the MCP server with the default stdio transport, ready for IDE integration:

jac mcp

Inspect the available resources, tools, and prompts:

jac mcp --inspect

Then add the server to your AI client's MCP configuration. A minimal entry looks like:

{
  "mcpServers": {
    "jac": {
      "command": "jac",
      "args": ["mcp"]
    }
  }
}

See the MCP reference for the full list of tools, resources, prompts, transport options, and per-IDE integration steps.

Documentation

• Agent Skills & MCP guide: https://docs.jaseci.org/quick-guide/agent-skills-and-mcp/
• MCP reference: https://docs.jaseci.org/reference/mcp/
• Jac language: https://www.jac-lang.org
• GitHub repository: https://github.com/jaseci-labs/jaseci

License

MIT