Extend Claude with skills changedskills
Nearest release: v2.1.301, published 4 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 15 Oct 2026 19:23 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 15 Oct 2026 19:37 UTC.
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665665You can also stack several skills at the start of one message. Typing `/write-tests /fix-issue 123` loads both skills and passes the trailing text `123` as `$ARGUMENTS` to each of them.
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667Claude Code expands the first skill plus up to five more stacked after it. Expansion stops at the first token that isn't an inline user-invocable skill, so a skill that runs as a [forked subagent](#run-skills-in-a-subagent), such as [`/code-review`](/docs/en/code-review#review-a-diff-locally), or one whose arguments may themselves start with a slash command, such as `/loop`, also ends the run there. That token and everything after it become the argument text for every expanded skill. `/code-review` runs as a forked subagent from v2.1.218; on earlier versions it ran inline and stacked.
667Claude Code expands the first skill plus up to five more stacked after it. Expansion stops at the first token that isn't an inline user-invocable skill, so a skill that runs as a [forked subagent](#run-skills-in-a-subagent), such as [`/code-review`](/docs/en/code-review-local), or one whose arguments may themselves start with a slash command, such as `/loop`, also ends the run there. That token and everything after it become the argument text for every expanded skill. `/code-review` runs as a forked subagent from v2.1.218; on earlier versions it ran inline and stacked.
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669669To access individual arguments by position, use `$ARGUMENTS[N]` or the shorter `$N`:
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802802A backgrounded fork also runs with the [narrower tool set that applies to background subagents](/docs/en/sub-agents#run-subagents-in-foreground-or-background): the skill's subagent is a regular agent type, so the exemption for subagents that fork the conversation doesn't cover it. If your skill's steps depend on a tool outside that set, set `background: false` to keep the full tool set.
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804A forked skill that runs in the background applies its edits outside your session's [checkpoints](/docs/en/checkpointing), so `/rewind` doesn't undo them; use git to revert them.
804A forked skill that runs in the background applies its edits outside your session's [checkpoints](/docs/en/checkpointing#subagent-edits-not-restored). After one, `/rewind` restores only the files Claude had already edited in your conversation. The skill's edits to other files stay, so use git to revert them.
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806806<Warning>
807807 `context: fork` only makes sense for skills with explicit instructions. If your skill contains guidelines like "use these API conventions" without a task, the subagent receives the guidelines but no actionable prompt, and returns without meaningful output.
No line in this hunk matches that.