Add MCP Registry sync pilot — workflow + drift-visible badges

.github/workflows/publish.yml

@@ -68,3 +68,42 @@ jobs:
 
       - name: Publish to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
+
+  # ---------------------------------------------------------------------------
+  # Registry-publish — pushes server.json to the Official MCP Registry after
+  # PyPI publish succeeds, so discovery surfaces stay in sync with PyPI.
+  # Canonical template: https://github.com/qso-graph/.github/blob/main/TEMPLATES.md
+  # ---------------------------------------------------------------------------
+  registry-publish:
+    name: Publish to MCP Registry
+    needs: publish
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write   # GitHub OIDC auth to the Registry
+      contents: read
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Install jq (server.json bump)
+        run: sudo apt-get update && sudo apt-get install -y jq
+
+      - name: Install mcp-publisher
+        run: |
+          curl -L "https://github.com/modelcontextprotocol/registry/releases/latest/download/mcp-publisher_$(uname -s | tr '[:upper:]' '[:lower:]')_$(uname -m | sed 's/x86_64/amd64/;s/aarch64/arm64/').tar.gz" | tar xz mcp-publisher
+          ./mcp-publisher --help > /dev/null
+
+      - name: Bump server.json to tag version
+        run: |
+          TAG_VERSION="${GITHUB_REF_NAME#v}"
+          echo "Setting server.json to ${TAG_VERSION}"
+          jq --arg v "$TAG_VERSION" \
+             '.version = $v | .packages[0].version = $v' \
+             server.json > /tmp/server.json
+          mv /tmp/server.json server.json
+          cat server.json
+
+      - name: Authenticate to MCP Registry (GitHub OIDC)
+        run: ./mcp-publisher login github-oidc
+
+      - name: Publish to MCP Registry
+        run: ./mcp-publisher publish

CHANGELOG.md

@@ -5,6 +5,31 @@ All notable changes to `solar-mcp` are documented here.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Added (CI hygiene)
+
+- **MCP Registry sync** — `publish.yml` now publishes to the
+  [Official MCP Registry](https://registry.modelcontextprotocol.io)
+  after each PyPI publish, using GitHub OIDC for auth. Triggered on
+  `v*` tag push; no manual steps. Pattern documented in
+  [qso-graph/.github/TEMPLATES.md](https://github.com/qso-graph/.github/blob/main/TEMPLATES.md).
+- **Registry version badge** in README — PyPI and Registry versions
+  visible side-by-side so any drift between publishing surfaces is
+  immediately apparent.
+
+### Known drift (will resolve on next tagged release)
+
+- Pre-`0.2.1` versions show as **stale** in the Official MCP Registry
+  (last sync was at v0.1.1). Forward-only sync model: the next real
+  release of solar-mcp catches the Registry up. We don't tag content-
+  free releases purely to sync.
+
+solar-mcp is the **pilot repo** for this rollout (per Patton's
+2026-05-16 architecture review). Once the next solar-mcp release
+demonstrates the workflow end-to-end, the same pattern fans out to
+the other 12 qso-graph + IONIS-AI MCP repos.
+
 ## [0.2.1] — 2026-05-15
 
 ### Added

README.md

@@ -1,10 +1,15 @@
 <!-- mcp-name: io.github.qso-graph/solar-mcp -->
 # solar-mcp
 
+[![PyPI](https://img.shields.io/pypi/v/solar-mcp?label=PyPI&color=blue)](https://pypi.org/project/solar-mcp/)
+[![MCP Registry](https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fregistry.modelcontextprotocol.io%2Fv0%2Fservers%3Fsearch%3Dsolar-mcp&query=%24.servers%5B0%5D.server.version&label=MCP%20Registry&color=blue)](https://registry.modelcontextprotocol.io/v0/servers?search=solar-mcp)
+
 MCP server for space weather and HF propagation conditions — live solar flux, Kp index, DSCOVR solar wind, X-ray flux, alerts, 27-day forecast, and band-by-band outlook through any MCP-compatible AI assistant.
 
 Part of the [qso-graph](https://qso-graph.io/) project. **No authentication required** — all data from [NOAA SWPC](https://www.swpc.noaa.gov/) public endpoints.
 
+> **Version drift?** If the PyPI and MCP Registry badges show different versions, the Registry is catching up to the latest PyPI release on this server's next tag. Forward-only sync — we don't tag content-free releases just to sync. See [qso-graph/.github TEMPLATES.md](https://github.com/qso-graph/.github/blob/main/TEMPLATES.md) for the sync mechanism.
+
 ## Install
 
 ```bash