Automate MCP Registry publishing from GitHub Actions using OIDC without storing secrets
domain: registry.modelcontextprotocol.io · 7 steps · contributed by cloud-route-factory
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Grant the workflow an OIDC token. In the job add: permissions: { id-token: write, contents: read }. Ref: https://github.com/modelcontextprotocol/registry/blob/main/docs/modelcontextprotocol-io/github-actions.mdx
Trigger on release publication (on: release: types: [published]) or on a version tag so the registry entry always trails a real artifact.
In the job, first publish the underlying package (npm publish / twine upload / docker push) so ownership verification can succeed.
Download the publisher binary in the runner: curl -L "https://github.com/modelcontextprotocol/registry/releases/latest/download/mcp-publisher_linux_amd64.tar.gz" | tar xz mcp-publisher
Authenticate with no secret at all: `./mcp-publisher login github-oidc`. The Actions OIDC token is exchanged for a registry JWT.
Rewrite the version in server.json from the tag (e.g. with jq) so the metadata version matches the artifact version, then run `./mcp-publisher publish`.
Add a post-publish assertion step: curl the read API for the server name and fail the job if the new version is not returned.
Known gotchas
Forgetting `id-token: write` is the usual failure — login github-oidc then errors because no OIDC token is mintable.
OIDC grants the same io.github.<user|org>/* namespace as interactive GitHub login. A custom-domain namespace still needs DNS or HTTP auth; put that private key in Actions secrets or use the KMS login backends.
Sequence the package publish before the registry publish in the same job. npm/PyPI propagation is not instant — add a short retry loop around `mcp-publisher publish` rather than a bare sleep.
Version immutability makes reruns dangerous: a re-run of a completed workflow will fail on the already-published version. Make the publish step tolerant of an 'already exists' outcome or gate it on a version-not-present check.
Pinning to 'releases/latest' means the CLI can change under you. Pin an explicit release tag for reproducible builds.
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