Add Codex plugin support with installation instructions (#15)

Author: rafaeelaudibert

.codex-plugin/plugin.json

@@ -0,0 +1,43 @@
+{
+  "name": "posthog",
+  "version": "1.0.2",
+  "description": "Access PostHog analytics, feature flags, experiments, error tracking, and insights directly from Codex",
+  "author": {
+    "name": "PostHog",
+    "email": "hey@posthog.com",
+    "url": "https://posthog.com"
+  },
+  "homepage": "https://posthog.com/docs/model-context-protocol",
+  "repository": "https://github.com/PostHog/ai-plugin",
+  "license": "MIT",
+  "keywords": [
+    "analytics",
+    "feature-flags",
+    "experiments",
+    "error-tracking",
+    "a/b-testing",
+    "surveys",
+    "dashboards",
+    "llm-analytics"
+  ],
+  "skills": "./skills/",
+  "mcpServers": "./.mcp.json",
+  "interface": {
+    "displayName": "PostHog",
+    "shortDescription": "Analytics, feature flags, experiments, and error tracking",
+    "longDescription": "Access PostHog analytics, feature flags, experiments, error tracking, and insights directly from Codex. Query your data, manage flags, run A/B tests, and debug errors without leaving your editor.",
+    "developerName": "PostHog",
+    "category": "Productivity",
+    "capabilities": ["Read", "Write"],
+    "websiteURL": "https://posthog.com",
+    "privacyPolicyURL": "https://posthog.com/privacy",
+    "termsOfServiceURL": "https://posthog.com/terms",
+    "defaultPrompt": [
+      "Show me all my feature flags",
+      "What errors are affecting the most users?",
+      "How many users signed up this week?"
+    ],
+    "brandColor": "#F9BD2B",
+    "logo": "./assets/logo.svg"
+  }
+}

.github/workflows/sync-skills.yml

@@ -87,7 +87,7 @@ jobs:
           echo "has_changes=true" >> "$GITHUB_OUTPUT"
 
           # Bump patch version in plugin manifests
-          for f in .claude-plugin/plugin.json .cursor-plugin/plugin.json gemini-extension.json; do
+          for f in .claude-plugin/plugin.json .cursor-plugin/plugin.json .codex-plugin/plugin.json gemini-extension.json; do
             if [ -f "$f" ]; then
               jq '.version |= (split(".") | .[2] = (.[2] | tonumber + 1 | tostring) | join("."))' "$f" > "$f.tmp" && mv "$f.tmp" "$f"
             fi

README.md

@@ -14,6 +14,12 @@ claude plugin install posthog
 
 Install from the [Cursor Marketplace](https://cursor.com/marketplace) or add manually in Cursor Settings > Plugins.
 
+### Codex
+
+```bash
+codex plugin install posthog
+```
+
 ### Gemini CLI
 
 ```bash