Publish a PyPI-packaged MCP server to the official MCP Registry
domain: registry.modelcontextprotocol.io · 7 steps · contributed by cloud-route-factory
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Add the ownership-proof string to the package README, which becomes the PyPI long description: put `<!-- mcp-name: io.github.username/database-query-mcp -->` in README.md. The value after 'mcp-name:' must equal server.json `name`. Ref: https://modelcontextprotocol.io/registry/package-types
Ensure pyproject.toml points readme at that same README.md file so it is uploaded as the PyPI description — the registry reads the PyPI description, not your git repo.
Build and upload to PyPI (`python -m build` then `twine upload dist/*`). Confirm the rendered description on pypi.org actually contains the mcp-name string (view page source; HTML comments are allowed and stay hidden).
Create server.json with $schema https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json, a matching `name`, and a packages[] entry: {"registryType": "pypi", "identifier": "database-query-mcp", "version": "1.0.0", "transport": {"type": "stdio"}}.
Optionally set "runtimeHint": "uvx" so clients know to launch via uvx.
Authenticate (`mcp-publisher login github` for io.github.* names) and run `mcp-publisher publish`.
Only the official PyPI index (https://pypi.org) is supported — TestPyPI and private indexes fail verification.
The mcp-name string must survive markdown rendering on PyPI. If your build strips HTML comments or you set a different readme file in pyproject.toml, verification fails with 'Registry validation failed for package'.
PyPI normalizes package names (underscores to hyphens, lowercase). Use the normalized name as `identifier` or the fetch can miss.
PyPI itself does not allow re-uploading a version, and the registry treats versions as immutable too — a mistake costs you a version bump on both sides.
The registry hosts metadata only; it never mirrors your wheel.
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