ci: publish the hosted MCP endpoint to the MCP Registry

.github/workflows/mcp-registry.yml

@@ -0,0 +1,40 @@
+# Tag `vX.Y.Z` → the hosted MCP endpoint listed in the official MCP Registry
+# (https://registry.modelcontextprotocol.io) as `io.github.lexmount/artifact-site`, version X.Y.Z.
+# server.json at the repository root is the listing; its version is taken from package.json at
+# publish time. Authentication is the GitHub Actions OIDC token of this repository, which the
+# registry maps to the io.github.lexmount/* namespace, so no token is stored here.
+# A version can be published once; to re-run for an existing tag, use "Run workflow" on that tag.
+name: MCP Registry
+
+on:
+  push:
+    tags: ["v*.*.*"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  publish:
+    name: publish to the MCP Registry
+    # Tags are pushed in the public repository; a matching tag in the private one must not publish.
+    if: github.repository == 'lexmount/artifact-site'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write # the registry verifies the OIDC token from this workflow
+    env:
+      MCP_PUBLISHER_VERSION: v1.8.1
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set the listing version from package.json
+        run: |
+          version="$(jq -r .version package.json)"
+          jq --arg v "$version" '.version = $v' server.json > server.tmp && mv server.tmp server.json
+          echo "publishing version $version"
+      - name: Install mcp-publisher
+        run: |
+          curl -fsSL "https://github.com/modelcontextprotocol/registry/releases/download/${MCP_PUBLISHER_VERSION}/mcp-publisher_linux_amd64.tar.gz" \
+            | tar -xz mcp-publisher
+      - run: ./mcp-publisher login github-oidc
+      - run: ./mcp-publisher publish

server.json

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+{
+  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
+  "name": "io.github.lexmount/artifact-site",
+  "title": "artifact-site",
+  "description": "One place for every AI agent's pages and docs: versioned links to share, search and update.",
+  "version": "0.3.0",
+  "websiteUrl": "https://artifact-site.app.lexmount.com",
+  "repository": {
+    "url": "https://github.com/lexmount/artifact-site",
+    "source": "github"
+  },
+  "remotes": [
+    {
+      "type": "streamable-http",
+      "url": "https://artifact-site.app.lexmount.com/mcp"
+    }
+  ]
+}