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HomeDocsClaude Code CLI 13 Oct 2026
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576576 
577577## Task tool availability
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579The task-tracking tools, `TaskCreate`, `TaskGet`, `TaskUpdate`, `TaskList`, and `TodoWrite`, are available by default only on Claude 3.x models, Opus 4 through 4.7, Sonnet 4 through 4.6, and Haiku 4.5. Wherever the tools are available, you get the four Task tools, or `TodoWrite` instead when you set [`CLAUDE_CODE_ENABLE_TASKS=0`](/docs/en/env-vars).
579The task-tracking tools, `TaskCreate`, `TaskGet`, `TaskUpdate`, `TaskList`, and `TodoWrite`, are available by default only on Opus 4.7, Sonnet 4.6, Haiku 4.5, and earlier models. Wherever the tools are available, you get the four Task tools, or `TodoWrite` instead when you set [`CLAUDE_CODE_ENABLE_TASKS=0`](/docs/en/env-vars).
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581581On every other model, Claude Code leaves the tools out unless you opt in. The same applies to a model ID Claude Code doesn't recognize, such as a custom model name served through an [LLM gateway](/docs/en/llm-gateway). On newer models, Claude keeps track of multi-step work without a written checklist, and the tools' definitions and reminders take up context. Without the tools, Claude adds nothing to the [task list](/docs/en/interactive-mode#task-list) while it works.
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646646The search backend is not configurable. To search with a different provider, add an [MCP server](/docs/en/mcp) that exposes a search tool.
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648648<Note>
649 WebSearch is available on the Claude API, [Claude Platform on AWS](/docs/en/claude-platform-on-aws), and Microsoft Foundry. On Google Cloud's Agent Platform it works with Claude 4 and later models, including Opus, Sonnet, and Haiku. Amazon Bedrock doesn't expose the server-side web search tool.
649 WebSearch is available on the Claude API, [Claude Platform on AWS](/docs/en/claude-platform-on-aws), and Microsoft Foundry. On Google Cloud's Agent Platform it works with Opus 4, Sonnet 4, Haiku 4.5, and later models. Amazon Bedrock doesn't expose the server-side web search tool.
650650</Note>
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652652### Session search limit
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