Extend agents with skills changedagent-sdk/skills
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513513The [Claude Code skills guide](/docs/en/skills) covers authoring in depth. Its guidance applies to SDK sessions. Start with these sections:
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515515* [Frontmatter reference](/docs/en/skills#frontmatter-reference): every supported field
516* [Pass arguments to skills](/docs/en/skills#pass-arguments-to-skills): `$ARGUMENTS`, `$0`, `$1`, and skill stacking. The [full substitution table](/docs/en/skills#available-string-substitutions) adds named arguments and the `${CLAUDE_*}` variables
516* [Pass arguments to skills](/docs/en/skills#pass-arguments-to-skills): `$ARGUMENTS`, `$0`, and `$1`. The [full substitution table](/docs/en/skills#available-string-substitutions) adds named arguments and the `${CLAUDE_*}` variables
517517* [Inject dynamic context](/docs/en/skills#inject-dynamic-context): `` !`command` `` lines that run before Claude sees the skill content
518518* [Choose where skills load](/docs/en/skills#where-skills-live): every skill location, plugin namespacing, and which skill runs when two share a name
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