# Agent Skill

> A packaged set of instructions, reference files, templates, or scripts that an agent can load on demand for a specific capability (often via an open Agent Skills standard).

- Category: Tools & Protocols
- Stage: Rising
- Also called: Skill, Reusable agent workflow, SKILL.md
- Canonical: https://www.joelcsaji.com/ai-dictionary/agent-skill

## Plain English

It is a reusable playbook the agent pulls in only when the task matches.

## Example

A `security-review` skill tells the agent what files to inspect, which checks to run, and how to report findings.

## Why it matters

Skills keep specialized knowledge out of the main prompt until needed, which helps reliability and context size across Cursor, Claude Code, Codex, and similar tools.

## Related

- [Slash Command](https://www.joelcsaji.com/ai-dictionary/slash-command)
- [Sub-Agent](https://www.joelcsaji.com/ai-dictionary/sub-agent)
- [Agent Instructions File](https://www.joelcsaji.com/ai-dictionary/agent-instructions-file)

## Mentioned in

- [Why Web Development is a Promising Career Choice](https://www.joelcsaji.com/blog/why-web-development-is-a-promising-career-choice)

## Sources

- [Agent Skills Specification](https://agentskills.io/specification)
- [Claude Code: Skills](https://code.claude.com/docs/en/skills)