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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.30

Enhanced Custom Subagent Schema

The settings schema for defining custom subagents has been formalized with descriptive annotations on all fields. New configurable fields include:

  • description: Natural language description of when to use the agent
  • tools: Array of allowed tool names (inherits from parent if omitted)
  • disallowedTools: Array of tool names to explicitly disallow
  • prompt: The agent's system prompt
  • model: Model selection (sonnet, opus, haiku, or inherit)
  • criticalSystemReminder_EXPERIMENTAL: Critical reminder injected into system prompt
  • skills: Array of skill names to preload into the agent context
  • maxTurns: Maximum agentic turns before stopping
Evidence

Subagent definition schema (search for "Definition for a custom subagent that can be invoked via the Task tool")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.30 →