> ## Documentation Index
> Fetch the complete documentation index at: https://docs.wandb.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Class: SubAgent

> TypeScript SDK reference

[weave](../) / SubAgent

A nested agent invocation — used when the current agent hands work to
another named agent (e.g. a planner calling a researcher). Emits an
`invoke_agent` span tagged with the sub-agent's name and (optionally)
its model.

Created by `weave.startSubagent()` (or `turn.startAgent()`, or
`llm.startAgent()`) and terminated with `end()`.

`Example`

```ts theme={null}
const sub = weave.startSubagent({name: 'researcher', model: 'gpt-4o'});
try {
  // ... orchestrate the sub-agent's LLM/Tool calls ...
} finally {
  sub.end();
}
```

## Table of contents

### Properties

* [model](./subagent#model)
* [name](./subagent#name)

### Methods

* [end](./subagent#end)
* [create](./subagent#create)

## Properties

### model

• `Readonly` **model**: `string`

#### Defined in

[genai/subagent.ts:41](https://github.com/wandb/weave/blob/6538626556c93d6f31ae725fdefe4e6b8b71bc2c/sdks/node/src/genai/subagent.ts#L41)

***

### name

• `Readonly` **name**: `string`

#### Defined in

[genai/subagent.ts:40](https://github.com/wandb/weave/blob/6538626556c93d6f31ae725fdefe4e6b8b71bc2c/sdks/node/src/genai/subagent.ts#L40)

## Methods

### end

▸ **end**(`opts?`): `void`

Close the SubAgent span. Idempotent. Pass `error` to mark it as failed.

#### Parameters

| Name          | Type     |
| :------------ | :------- |
| `opts?`       | `Object` |
| `opts.error?` | `Error`  |

#### Returns

`void`

#### Defined in

[genai/subagent.ts:65](https://github.com/wandb/weave/blob/6538626556c93d6f31ae725fdefe4e6b8b71bc2c/sdks/node/src/genai/subagent.ts#L65)

***

### create

▸ **create**(`opts`): [`SubAgent`](./subagent)

#### Parameters

| Name   | Type                                                              |
| :----- | :---------------------------------------------------------------- |
| `opts` | [`SubAgentInit`](../interfaces/subagentinit) & `ChildSpanContext` |

#### Returns

[`SubAgent`](./subagent)

#### Defined in

[genai/subagent.ts:44](https://github.com/wandb/weave/blob/6538626556c93d6f31ae725fdefe4e6b8b71bc2c/sdks/node/src/genai/subagent.ts#L44)