Subagents in the SDK changedagent-sdk/subagents
Nearest release: v2.1.235, published 6 hours before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
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189189<Note>
190190 Even without defining custom subagents, Claude can spawn the built-in `general-purpose` subagent. This is useful for delegating research or exploration tasks without creating specialized agents. Include `Agent` in `allowedTools` so these invocations auto-approve without a permission prompt.
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192 A call to the Agent tool that leaves out `subagent_type` gets this built-in `general-purpose` subagent. If you disable the built-in subagents with [`CLAUDE_AGENT_SDK_DISABLE_BUILTIN_AGENTS=1`](/docs/en/env-vars), there is nothing to fall back to. Such a call then fails with `subagent_type is required: the general-purpose agent is not available in this session`, followed by the names of your subagents. Before TypeScript SDK v0.3.235 (Python SDK: bundled Claude Code earlier than v2.1.235), it failed with `Agent type 'general-purpose' not found` instead.
192 When Claude calls the Agent tool without a `subagent_type`, it gets this built-in `general-purpose` subagent. If you set [`CLAUDE_AGENT_SDK_DISABLE_BUILTIN_AGENTS=1`](/docs/en/env-vars), that default is gone too. Such a call then fails with `subagent_type is required: the general-purpose agent is not available in this session`. The message ends with the subagent types that are still available. Before TypeScript SDK v0.3.235 (Python SDK: bundled Claude Code before v2.1.235), the same call failed with `Agent type 'general-purpose' not found`.
193193</Note>
194194
195195## What subagents inherit
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