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HomeDocsClaude Code CLI 20 Aug 2026
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Agent SDK reference - TypeScript changedagent-sdk/typescript

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26272627 On other models, Claude Code provides the Task tools by default and `TodoWrite` only when you set `CLAUDE_CODE_ENABLE_TASKS=0`.
26282628 
2629 See [Model availability](/docs/en/agent-sdk/todo-tracking#model-availability) to opt in and [Migrate to Task tools](/docs/en/agent-sdk/todo-tracking#migrate-to-task-tools) to update your monitoring code.
2629 See [Model availability](/docs/en/agent-sdk/todo-tracking#model-availability) to opt in.
26302630</Note>
26312631 
26322632### TaskCreate
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35593559 On other models, Claude Code provides the Task tools by default and `TodoWrite` only when you set `CLAUDE_CODE_ENABLE_TASKS=0`.
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3561 See [Model availability](/docs/en/agent-sdk/todo-tracking#model-availability) to opt in and [Migrate to Task tools](/docs/en/agent-sdk/todo-tracking#migrate-to-task-tools) to update your monitoring code.
3561 See [Model availability](/docs/en/agent-sdk/todo-tracking#model-availability) to opt in.
35623562</Note>
35633563 
35643564### TaskCreate
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42634263### `ModelUsage`
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4265Per-model usage statistics returned in result messages. The `costUSD` value is a client-side estimate. See [Track cost and usage](/docs/en/agent-sdk/cost-tracking) for billing ca
4265Per-model usage statistics returned in result messages. The `costUSD` value is a client-side estimate. See [Track cost and usage](/docs/en/agent-sdk/cost-tracking) for billing caveats.
4266 
4267```typescript theme={null}
4268type ModelUsage = {
4269 inputTokens: number;
4270 outputTokens: number;
4271 cacheReadInputTokens: number;
4272 cacheCreationInputTokens: number;
4273 webSearchRequests: number;
4274 costUSD: number;
4275 contextWin
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