Myst

myst-mcp is an MCP server for searching any MyST Markdown or Jupyter Book documentation site that publishes myst.search.json. It consumes the static search index that MyST already builds, so it does not crawl pages, host a backend, or require embeddings.

MyST is the document engine and Jupyter Book is a distribution of it. The myst.search.json index is produced at the MyST engine layer, which means this package works across book-theme, article-theme, custom themes, Jupyter Book, and plain mystmd sites.

Usage

npx -y myst-mcp <site-url-or-local-path> ["Human description of these docs"]

Examples:

npx -y myst-mcp https://your-myst-site.example "Example MyST docs"

{
  "mcpServers": {
    "my-docs": {
      "command": "npx",
      "args": ["-y", "myst-mcp", "https://your-myst-site.example", "Example MyST docs"]
    }
  }
}

Claude Code:

claude mcp add my-docs -- npx -y myst-mcp https://your-myst-site.example "Example MyST docs"

Tools

search_docs

Input:

{ "query": "installation", "limit": 10 }

Returns search hits with title, section, breadcrumb, absolute URL, snippet, type, and score.

fetch_page

Input:

{ "url": "/getting-started/" }

Returns the page title and LLM-friendly Markdown reconstructed from all matching search index records in document order. Full URLs and anchor URLs are accepted.

Supported sources

• Remote MyST sites, loaded from <base>/myst.search.json
• Local MyST site build directories containing myst.search.json
• A direct local path to myst.search.json

The server requires MystSearchIndex version "1" and fails clearly if the file is missing, invalid, or from an unsupported future version.

Development

pnpm install
pnpm build
pnpm test