Create custom subagents changedsub-agents
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299299| `isolation` | No | Set to `worktree` to run the subagent in a temporary [git worktree](/docs/en/worktrees), giving it an isolated copy of the repository branched by default from your [default branch](/docs/en/worktrees#choose-the-base-branch) rather than the parent session's `HEAD`. The worktree is automatically cleaned up if the subagent makes no changes |
300300| `color` | No | Display color for the subagent in the task list and transcript. Accepts `red`, `blue`, `green`, `yellow`, `purple`, `orange`, `pink`, or `cyan` |
301301| `initialPrompt` | No | Auto-submitted as the first user turn when this agent runs as the main session agent (via `--agent` or the `agent` setting). [Commands](/docs/en/commands) and [skills](/docs/en/skills) are processed. Prepended to any user-provided prompt |
302| `experimental` | No | Map of experimental options. Set its `cacheTtl` key to `5m` or `1h` to choose the [prompt cache lifetime](/docs/en/prompt-caching#choose-the-ttl-yourself) for this subagent's requests. Claude Code ignores any other value, ignores `1h` while your Claude subscription is using usage credits, and reads the field only from subagent files. Requires Claude Code v2.1.248 or later |
302303
304Write `cacheTtl` inside the `experimental` map, not at the top level of the frontmatter.
305
306```yaml theme={null}
307---
308name: repo-auditor
309description: Audits a large repository and reports what it finds
310experimental:
311 cacheTtl: 1h
312---
313```
314
303315#### Subagent files Claude Code skips
304316
305317Claude Code skips a file in a project, user, or managed `agents` directory, or in one under a directory you add with `--add-dir`, without reporting it in the session, when the frontmatter has any of these problems:
306318
307319* **No `name`**: Claude Code treats the file as documentation kept beside your agents.
320* **An opening `---` that isn't the file's first line**: Claude Code reads the file as having no frontmatter and treats it as documentation.
308321* **A `name` that starts with `-` or contains `:`**: Claude Code skips the file and writes an error to the debug log. See the `name` row in the table above.
309322* **A `name` but no `description`**: Claude Code skips the file and writes the reason to the debug log.
310323* **YAML that doesn't parse**: Claude Code reads no fields from the file, skips it, and writes the parse error to the debug log.
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