Agent SDK reference - TypeScript changedagent-sdk/typescript
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413413| `agent` | `string` | `undefined` | Agent name for the main thread. The agent must be defined in the `agents` option or in settings |
414414| `agents` | `Record<string, [`AgentDefinition`](#agentdefinition)>` | `undefined` | Programmatically define subagents |
415415| `agentProgressSummaries` | `boolean` | `false` | When `true`, generate one-line progress summaries for subagents and forward them on [`task_progress`](#sdktaskprogressmessage) events via the `summary` field. Applies to foreground and background subagents |
416| `allowDangerouslySkipPermissions` | `boolean` | `false` | Enable bypassing permissions. Required when using `permissionMode: 'bypassPermissions'` |
416| `allowDangerouslySkipPermissions` | `boolean` | `false` | Enable bypassing permissions. Required when using `permissionMode: 'bypassPermissions'`, at startup or later through `setPermissionMode()`. See [plan mode](/docs/en/agent-sdk/permissions#plan-mode-plan) for how it interacts with `permissionMode: 'plan'` |
417417| `allowedTools` | `string[]` | `[]` | Tools to auto-approve without prompting. This does not restrict Claude to only these tools. If you name one of the [task-tracking tools](/docs/en/agent-sdk/todo-tracking#model-availability) here, Claude Code also opts the session in. Other unlisted tools fall through to `permissionMode` and `canUseTool`. Use `disallowedTools` to block tools. See [Permissions](/docs/en/agent-sdk/permissions#allow-and-deny-rules) |
418418| `betas` | [`SdkBeta`](#sdkbeta)`[]` | `[]` | Enable beta features |
419419| `canUseTool` | [`CanUseTool`](#canusetool) | `undefined` | Custom permission function, invoked only when the [permission flow](/docs/en/agent-sdk/permissions#how-permissions-are-evaluated) falls through to a prompt. Not invoked for calls auto-approved by `allowedTools`, allow rules, or `permissionMode`. An allow rule doesn't pre-approve the [actions no mode auto-approves](/docs/en/permission-modes#actions-no-mode-auto-approves). See [`CanUseTool`](#canusetool) for details |
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