Add OpenAI Codex plugin manifest

.codex-plugin/plugin.json

@@ -0,0 +1,43 @@
+{
+  "name": "sdk",
+  "version": "0.1.0",
+  "description": "Agent skills and verified examples for writing Zapier SDK code that works.",
+  "author": {
+    "name": "Zapier",
+    "email": "support@zapier.com",
+    "url": "https://zapier.com"
+  },
+  "homepage": "https://docs.zapier.com/sdk",
+  "repository": "https://github.com/zapier/sdk",
+  "license": "MIT",
+  "keywords": [
+    "zapier",
+    "sdk",
+    "agent",
+    "ai-agent",
+    "mcp",
+    "automation",
+    "integration",
+    "typescript"
+  ],
+  "skills": "./skills/",
+  "interface": {
+    "displayName": "Zapier SDK",
+    "shortDescription": "Programmatic access to Zapier's 9,000+ apps via the TypeScript SDK.",
+    "longDescription": "Let your agent connect to anything. Zapier handles the keys. Ships the zapier-sdk skill, the zapier-sdk-explorer subagent, and a verified examples corpus so your code uses real action keys the first time.",
+    "developerName": "Zapier",
+    "category": "Developer Tools",
+    "capabilities": [],
+    "websiteURL": "https://docs.zapier.com/sdk",
+    "privacyPolicyURL": "https://zapier.com/privacy",
+    "termsOfServiceURL": "https://zapier.com/tos",
+    "defaultPrompt": [
+      "Connect Notion via Zapier and search my pages",
+      "Send an email through Gmail using the Zapier SDK",
+      "Look up a Google Sheets row with the Zapier SDK"
+    ],
+    "brandColor": "#FF4F00",
+    "logo": "./assets/logo.svg",
+    "composerIcon": "./assets/icon.svg"
+  }
+}

README.md

@@ -89,7 +89,16 @@ Result: fewer round trips to the docs, no more invented action keys, and workflo
 /plugin install sdk@zapier
 ```
 
-### Cursor, Codex, Copilot, and other assistants
+### OpenAI Codex
+
+```
+codex plugin marketplace add zapier/marketplace
+codex plugin add sdk@zapier
+```
+
+Or open the in-CLI picker with `/plugins` and toggle the SDK plugin on.
+
+### Cursor, Copilot, and other assistants
 
 The [skill](./skills/zapier-sdk/) conforms to [agentskills.io](https://agentskills.io) so any conformant runtime can load it directly. For tools without native agentskills.io support, clone the repo and reference `skills/zapier-sdk/SKILL.md` from your assistant's rules or instructions file (`.cursorrules`, `AGENTS.md`, `.github/copilot-instructions.md`, etc.):