Learn: Agent Plugin and Skill Guides
Guides on building, packaging, measuring, evaluating, and improving Agent Plugins and Skills for Claude Code, Claude Cowork, OpenAI Codex, and SKILL.md-based agent harnesses.
Practical guides for Agent Plugins - the installable apps in emerging agent harnesses - and the SKILL.md capabilities inside them. Start with one plugin product users install, version, and trust. Then adapt it for Claude Code, Claude Cowork, OpenAI Codex, and SKILL.md-based harnesses while keeping one component inventory, telemetry contract, eval set, and improvement loop.
Start here
- What Is an Agent Plugin? - the app-level package Telvine is built to manage.
- How to Build an Agent Plugin - the build-once guide for Claude Code, Claude Cowork, OpenAI Codex, and SKILL.md-based harnesses.
- What Is an Agent Skill? - the capability layer inside many plugins.
- How to Create an Agent Skill - a step-by-step
SKILL.mdwalkthrough. - SKILL.md Template and Examples - copy-paste capability scaffolds.
- Agent Plugin Templates - forkable starter plugins for Gmail triage, Slack support, browser automation, PDF review, spreadsheet reporting, internal ops, CRM enrichment, and code review.
- Agent Plugin and Skill Best Practices - 13 rules for plugins that contain Skills.
- Agent Plugin and Skill Security - how enterprises should evaluate plugin install risk, scanning, permissions, and telemetry.
Build for Claude and Codex
- Build a plugin for Anthropic Claude Cowork (and Claude Code)
- Build a plugin for OpenAI Codex
- Add a plugin marketplace to Claude Cowork
- Add a plugin marketplace to Codex
Then improve what you ship
- How to Measure Agent Plugin Usage - the package and capability metrics, evals, and feedback loops that tell you whether a release actually helped.
Ready to instrument your own? Start with the quickstart →