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Subagents in the SDK changedagent-sdk/subagents

Nearest release: v2.1.307, published 5 hours after upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 21 Oct 2026 14:49 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 21 Oct 2026 15:07 UTC.

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First seen 14 Aug 2026 this site's first read of the page
Recorded edits24to this page, all time

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143143| `tools` | `string[]` | No | Array of allowed tool names. If omitted, inherits every [tool available to subagents](/docs/en/sub-agents#available-tools) |
144144| `disallowedTools` | `string[]` | No | Array of tool names to remove from the agent's tool set. MCP server-level patterns are also accepted: `mcp__server` or `mcp__server__*` removes every tool from that server, and `mcp__*` removes every MCP tool from any server |
145145| `model` | `string` | No | Model override for this agent. Accepts an alias such as `'fable'`, `'opus'`, `'sonnet'`, `'haiku'`, `'inherit'`, or a full model ID. `'inherit'` uses the main model. When you omit it, Claude Code picks the model in the [subagent model order](/docs/en/sub-agents#choose-a-model) |
146| `skills` | `string[]` | No | List of skill names to preload into the agent's context at startup. Unlisted skills remain invocable through the Skill tool |
146| `skills` | `string[]` | No | List of skill names to preload into the agent's context at startup. At most the [first 32 distinct names](/docs/en/sub-agents#preload-skills-into-subagents) in the list are preloaded. Unlisted skills remain invocable through the Skill tool |
147147| `memory` | `'user' \| 'project' \| 'local'` | No | Memory source for this agent |
148148| `mcpServers` | `(string \| object)[]` | No | MCP servers available to this agent, by name or inline config |
149149| `initialPrompt` | `string` | No | Auto-submitted as the first user turn when this agent runs as the main thread agent. Ignored when the agent is invoked as a subagent |
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320320Claude invokes subagents through the Agent tool. To detect when a subagent is invoked, check for `tool_use` blocks where `name` is `"Agent"`.
321321 
322Messages from within a subagent's context include a `parent_tool_use_id` field. In TypeScript, each assistant and user message a subagent produces also carries [`agent_id`](/docs/en/agent-sdk/typescript#sdkassistantmessage): the `task_id` of that subagent's [task events](/docs/en/agent-sdk/typescript#sdktaskstartedmessage). `agent_id` requires TypeScript Agent SDK v0.3.292 or later.
322Messages from within a subagent's context include a `parent_tool_use_id` field. In TypeScript, each assistant and user message a subagent produces also carries [`agent_id`](/docs/en/agent-sdk/typescript#sdkassistantmessage): the `task_id` of that subagent's [task events](/docs/en/agent-sdk/typescript#sdktaskstartedmessage). `agent_id` stays the same when you [resume the subagent](#resume-subagents). `agent_id` requires TypeScript Agent SDK v0.3.292 or later.
323323 
324324> [!NOTE]
325325>
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