Extend Claude with skills changedskills
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Upstream edited this page at 29 Oct 2026 19:24 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 29 Oct 2026 19:37 UTC.
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400400| `allowed-tools` | No | Tools Claude can use without asking permission during the turn that invokes this skill. The grant clears when you send your next message. Accepts a space- or comma-separated string, or a YAML list. See [Pre-approve tools for a skill](#pre-approve-tools-for-a-skill). |
401401| `disallowed-tools` | No | Tools removed from Claude's available pool while this skill is active. Use for autonomous skills that should never call certain tools, such as `AskUserQuestion` for a background loop. Accepts a space- or comma-separated string, or a YAML list. The restriction clears when you send your next message. Like deny rules, the field can't remove [`EndConversation`](https://code.claude.com/docs/en/tools-reference#endconversation-tool-behavior) while any other tool remains. |
402402| `model` | No | Model to use when this skill is active. The override applies for the rest of the current turn and isn't saved to settings. The session model resumes when you send your next prompt. Accepts the same values as [`/model`](https://code.claude.com/docs/en/model-config), or `inherit` to keep the active model. A value excluded by your organization's [`availableModels`](https://code.claude.com/docs/en/model-config#restrict-model-selection) allowlist isn't used, and the session keeps its current model. In [auto mode](https://code.claude.com/docs/en/permission-modes.md#eliminate-prompts-with-auto-mode), and in [plan mode while the classifier reviews commands](https://code.claude.com/docs/en/permission-modes.md#analyze-before-you-edit-with-plan-mode), a model that auto mode doesn't support also isn't used, and the session keeps its current model. With `context: fork`, the value sets the [forked subagent's model](#run-skills-in-a-subagent) instead, and an excluded value follows the [same rules as a subagent model override](https://code.claude.com/docs/en/model-config.md#restrict-model-selection). |
403| `effort` | No | [Effort level](https://code.claude.com/docs/en/model-config.md#adjust-effort-level) when this skill is active. Overrides the session effort level. When you omit it, the level comes from the [effort resolution order](https://code.claude.com/docs/en/model-config.md#adjust-effort-level). Options: `low`, `medium`, `high`, `xhigh`, `max`; available levels depend on the model. |
403| `effort` | No | [Effort level](https://code.claude.com/docs/en/model-config.md#adjust-effort-level) for the rest of the current turn. Overrides the session effort level, but not the [`CLAUDE_CODE_EFFORT_LEVEL`](https://code.claude.com/docs/en/env-vars#variables) environment variable. With `context: fork`, the value sets the forked subagent's effort level instead. When you omit it, the level comes from the [effort resolution order](https://code.claude.com/docs/en/model-config.md#adjust-effort-level). Options: `low`, `medium`, `high`, `xhigh`, `max`; available levels depend on the model. |
404404| `context` | No | Set to `fork` to run in a forked subagent context. See [Run skills in a subagent](#run-skills-in-a-subagent). |
405405| `agent` | No | Which subagent type to use when `context: fork` is set. |
406406| `background` | No | Only applies with `context: fork`. Set to `false` to wait for the forked subagent's result in the turn that invoked the skill, instead of [running it in the background](#run-skills-in-a-subagent). Default: `true`. |
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