Add Codex CLI plugin manifest

.codex-plugin/plugin.json

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+{"name": "mcp-language-server", "version": "0.1.0", "description": "mcp-language-server gives MCP enabled clients access semantic tools like get definition, references, rename, and diagnostics.", "author": {"name": "Isaac Phillips", "url": "https://github.com/isaacphi"}, "homepage": "https://github.com/isaacphi/mcp-language-server", "repository": "https://github.com/isaacphi/mcp-language-server", "keywords": ["mcp", "codex", "language-server", "ide", "developer-tools"], "mcpServers": "./.mcp.json", "skills": "./skills/", "interface": {"displayName": "Language Server", "shortDescription": "Semantic tools for code analysis", "longDescription": "mcp-language-server gives MCP enabled clients access semantic tools like get definition, references, rename, and diagnostics.", "category": "Developer Tools", "websiteURL": "https://github.com/isaacphi/mcp-language-server"}}

.github/workflows/codex-plugin-scanner.yml

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+name: Codex Plugin Quality Gate
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: codex-plugin-scanner-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  scan:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - name: Codex plugin scanner
+        uses: hashgraph-online/hol-codex-plugin-scanner-action@b45d6b583afe05819b24edc8e6418c9ad2e1f1d0 # v1

skills/lang/SKILL.md

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+---
+name: lang
+description: Semantic tools for code analysis
+---
+
+# Language Server
+
+mcp-language-server gives MCP enabled clients access semantic tools like get definition, references, rename, and diagnostics.
+
+## When to use
+- When you need language server capabilities in your Codex workflow
+- See https://github.com/isaacphi/mcp-language-server for full setup instructions