Sweep 22 Sep 2026 · 15:52Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
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One change · claude-code

Extend agents with skills changed

agent-sdk/skills

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9191 
9292### Confirm skills loaded
9393 
94Near the start of the stream, the SDK yields a system message with subtype `init`. Check its `skills` array to confirm your skills loaded before Claude starts working. The array includes the user-invocable skills that you have defined, along with [bundled skills included with Claude Code](/docs/en/skills#bundled-skills).
94Near the start of the stream, the SDK yields a system message with subtype `init`. Check its `skills` array to confirm your skills loaded before Claude starts working. The array includes the user-invocable skills that you have defined with a `description` or `when_to_use` frontmatter field, along with [bundled skills included with Claude Code](/docs/en/skills#bundled-skills).
9595 
96The array lists user-invocable skills only. A skill with [`user-invocable: false`](/docs/en/skills#control-who-invokes-a-skill) in its frontmatter loads and remains available to Claude, but doesn't appear in the array. The array reflects what the session discovered and lists the same skills whether or not they're in your `skills` list.
96The array lists user-invocable skills only. A skill with [`user-invocable: false`](/docs/en/skills#control-who-invokes-a-skill) in its frontmatter loads and remains available to Claude, but doesn't appear in the array. The array lists the same skills whether or not they're in your `skills` list.
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9898### Allow only specific skills
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from line 155
155155Available commands: ["clear", "compact", "context", "usage", "code-review", "verify", "security-check", ...]
156156```
157157 
158Your user-invocable skills appear in both this list and the `skills` array from [Confirm skills loaded](#confirm-skills-loaded). The `slash_commands` list adds the rest of the commands available in your session. A skill with [`user-invocable: false`](/docs/en/skills#control-who-invokes-a-skill) in its frontmatter doesn't appear in either. Sessions that configure [MCP servers](/docs/en/agent-sdk/mcp) can also expose [MCP prompts as commands](/docs/en/mcp#use-mcp-prompts-as-commands).
158A skill with [`user-invocable: false`](/docs/en/skills#control-who-invokes-a-skill) in its frontmatter doesn't appear in this list or in the `skills` array from [Confirm skills loaded](#confirm-skills-loaded). Sessions that configure [MCP servers](/docs/en/agent-sdk/mcp) can also expose [MCP prompts as commands](/docs/en/mcp#use-mcp-prompts-as-commands).
159159 
160160### Dispatch commands by name
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