ci: add MCP interface diff workflow for Everything server

.github/workflows/everything-mcp-diff.yml

@@ -0,0 +1,69 @@
+# Tracks public interface changes to the Everything MCP server.
+# The Everything server is a reference implementation demonstrating all MCP features.
+# This workflow helps reviewers see how tools, resources, prompts, and capabilities
+# evolve over time - useful for SDK compliance validation and catching regressions.
+#
+# See: https://github.com/modelcontextprotocol/inspector/issues/1034
+name: Everything Server MCP Diff
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'src/everything/**'
+  pull_request:
+    paths:
+      - 'src/everything/**'
+  # Manual trigger for comparing any two refs (commits, tags, branches)
+  workflow_dispatch:
+    inputs:
+      compare_ref:
+        description: 'Base ref to compare against (commit SHA, tag, or branch)'
+        required: false
+        default: ''
+      target_ref:
+        description: 'Target ref to compare (defaults to current branch if empty)'
+        required: false
+        default: ''
+
+permissions:
+  contents: read
+
+jobs:
+  mcp-diff:
+    name: Diff Everything Server Interface
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.inputs.target_ref || github.ref }}
+
+      - name: Run MCP Server Diff
+        uses: SamMorrowDrums/mcp-server-diff@a5555e85d68eaa014a334ae7d12b73787f2c49cc # v2.3.5
+        with:
+          setup_node: 'true'
+          node_version: '22'
+          install_command: cd src/everything && npm ci
+          build_command: cd src/everything && npm run build
+          start_command: node src/everything/dist/index.js stdio
+          compare_ref: ${{ github.event.inputs.compare_ref || '' }}
+          server_timeout: '15'
+
+      - name: Add summary context
+        if: always()
+        run: |
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "---" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "ℹ️ **Interpreting Results**" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "The Everything server is a reference implementation that exercises all MCP features." >> $GITHUB_STEP_SUMMARY
+          echo "Interface changes here may indicate:" >> $GITHUB_STEP_SUMMARY
+          echo "- New MCP protocol features being demonstrated" >> $GITHUB_STEP_SUMMARY
+          echo "- Updated tool schemas or descriptions" >> $GITHUB_STEP_SUMMARY
+          echo "- New resources, prompts, or capabilities" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "Review changes to ensure they align with the intended protocol updates." >> $GITHUB_STEP_SUMMARY