# Agent skill

A package of instructions and files, written in an open text-based format, that an agent loads only when a task needs it.

Also called: Skills, SKILL.md, Playbooks

Kind of: Agent harness

Often confused with: Tool, Prompt template

Related: System prompt

Source: https://redfinchadvisory.com/lexicon/agent-skill (version 1.0, changed 2026-10-21)