BUILD

Make a skill or an agent

Atlas writes the file for you. Pick a template, fill the form, download a `.md` you can drop into .claude/skills/<name>/SKILL.md or .claude/agents/.

OPTION A

Make a skill

A small unit Claude Code triggers automatically when the user asks for it.

auto-triggeredSKILL.mdfrontmatter required

Best for: a single output (a research brief, a tweet draft, a code review checklist) the agent should know about and fire when relevant phrases appear.

OPTION B

Make an agent

A specialist subagent the parent delegates multi-step work to.

delegatedtools listlonger-running

Best for: end-to-end tasks (a code review, a launch plan, a market scan) where the parent agent should hand off and wait for a final report.

STILL DECIDING?

Rule of thumb — if the answer is "the agent fires it on the right phrase and produces a single artifact", it's a skill. If it's "go away for a few minutes and come back with a finished result", it's an agent. You can also create both — the skill calls the agent.