Software EngineeringAI & Agent WorkflowsOpen accessPublished 2 Oct 2026
Design, validate, and ship a marketplace Plugin (or Skill bundle) with proper manifest format, multi-ecosystem compatibility, version pinning, manifest fallback, install idempotency, and three-layer startup sync.
USE WHEN: writing a new Plugin manifest, picking manifest format (Legacy vs AgentPlugin), adding `skills` / `mcp_servers` / `apps` / `hooks` / `interface` fields, validating a plugin before publish, designing marketplace install/remove/upgrade flows, or any task involving "make my plugin actually work in Codex".
TRIGGER PHRASES: "plugin manifest", "PluginManifest", "marketplace", "agent plugin", ".agents/plugins/marketplace.json", "manifest fallback", "idempotenc…
