---
title: "Agent"
sidebarTitle: "Agent"
description: "API reference for Agent / AgentRuntime from @cline/agents."
---

`Agent` is an alias for `AgentRuntime` from `@cline/agents`.

```typescript
import { Agent, AgentRuntime, createAgent, createAgentRuntime } from "@cline/sdk"
```

## Constructor

```typescript
new Agent(config: AgentRuntimeConfig)
```

`AgentRuntimeConfig` accepts either:

- a prebuilt `model: AgentModel`, or
- `providerId`, `modelId`, and optional provider credentials (`apiKey`, `baseUrl`, `headers`).

Common fields:

| Field | Type | Required | Description |
|-------|------|----------|-------------|
| `providerId` | `string` | Yes, unless `model` supplied | Provider ID |
| `modelId` | `string` | Yes, unless `model` supplied | Model ID |
| `apiKey` | `string` | No | Provider API key |
| `baseUrl` | `string` | No | Custom provider base URL |
| `systemPrompt` | `string` | No | System instructions |
| `tools` | `AgentTool[]` | No | Tools available to the runtime |
| `initialMessages` | `AgentMessage[]` | No | Preloaded conversation |
| `toolPolicies` | `Record<string, ToolPolicy>` | No | Per-tool enablement/approval |
| `hooks` | `AgentRuntimeHooks` | No | Runtime lifecycle hooks |

## Methods

### `run(input)`

```typescript
const result = await agent.run("Analyze this codebase")
```

Starts a run with input.

### `continue(input?)`

```typescript
const result = await agent.continue("Now inspect the auth module")
```

Continues with optional new input.

### `abort(reason?)`

```typescript
agent.abort("User cancelled")
```

Aborts the active run.

### `subscribe(listener)`

```typescript
const unsubscribe = agent.subscribe((event) => {
  console.log(event.type)
})
```

Subscribes to `AgentRuntimeEvent` events.

### `restore(messages)`

```typescript
agent.restore(savedMessages)
```

Replaces conversation history and resets runtime state while preserving tools, hooks, model, agent identity, and subscribers.

### `snapshot()`

```typescript
const state = agent.snapshot()
```

Returns an `AgentRuntimeStateSnapshot`.

## AgentRunResult

```typescript
interface AgentRunResult {
  agentId: string
  agentRole?: string
  runId: string
  status: "completed" | "aborted" | "failed"
  iterations: number
  outputText: string
  messages: readonly AgentMessage[]
  usage: AgentUsage
  error?: Error
}
```

## Factories

```typescript
const agent = createAgent(config)
const runtime = createAgentRuntime(config)
```