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Agent SDK reference - Python Claude Code CLI · in the page agent-sdk/python …"durationSeconds": float, # Search duration in seconds } ``` ### TodoWrite **Tool name:** `TodoWrite` <Note> On Python Agent SDK 0.2.139 and later, the following tools aren't available on Opu… Track todos Claude Code CLI · in the page agent-sdk/todo-tracking …ythos 5, or later versions of those families unless you opt in: * `TodoWrite` * `TaskCreate` * `TaskGet` * `TaskUpdate` * `TaskList` On other models, Claude Code provides the Task tools… Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …stInput | TaskOutputInput | TaskStopInput | TaskUpdateInput | TodoWriteInput | WebFetchInput | WebSearchInput | WorkflowInput; ``` ### Agent **Tool name:** `Agent`. The previous name `… Claude Code changelog Claude Code CLI · in the page changelog …l git hosts * Todo/task-tracking tools (TaskCreate/Get/Update/List, TodoWrite) are no longer available on Opus 4.8, Sonnet 5, Fable 5, Mythos 5, and newer models; set `CLAUDE_CODE_ENABLE_TODO_TOOLS=… Environment variables Claude Code CLI · in the page env-vars …TaskUpdate`, `TaskGet`, and `TaskList`. Set to `0` to get the legacy `TodoWrite` tool instead. See [Task list](/docs/en/interactive-mode#task-list)… Create custom subagents Claude Code CLI · in the page sub-agents …werShell`, `Edit`, `Write`, `NotebookEdit`, `WebFetch`, `WebSearch`, `TodoWrite`, `Skill`, `ToolSearch`, `EnterWorktree`, `ExitWorktree`, `Monitor`, `TaskStop`, `SendMessage`, and `Artifact`. Claude C… Tools reference Claude Code CLI · in the page tools-reference …| No | | `TodoWrite` | Manages the session task checklist. Disabled by default in favor of `TaskCreate`, `TaskGet`, `TaskList`, a… Week 33 · August 10–14, 2026 Claude Code CLI · in the page whats-new/2026-w33 …, such as <code>TaskCreate</code>, <code>TaskUpdate</code>, and <code>TodoWrite</code>, are <a href="/docs/docs/en/tools-reference#task-tool-availability">no longer available on Opus 4.8, Sonnet 5, Fa… Configuration reference Claude Documentation · in the page third-party/claude-desktop/configuration …t`, `Glob`, `Grep`, `NotebookEdit`, `WebFetch`, `WebSearch`, `Task`, `TodoWrite`, `TaskCreate`, `TaskUpdate`, `TaskGet`, `TaskList`, `TaskStop`, `Skill`, `REPL`, `JavaScript`, `AskUserQuestion`, `Tool…