18 pages for canusetool.

migration Claude Developer Platform · in the page managed-agents/migration …on_mode` (typescript: `permissionMode`), `can_use_tool` (typescript: `canUseTool`) | Per-tool [`permission_policy` (java, php: `permissionPolicy`; csharp, go: `PermissionPolicy`)](https://platform.cla… How the agent loop works Claude Code CLI · in the page agent-sdk/agent-loop …s to them that need approval fall through to the permission mode and `canUseTool`. * **`disallowed_tools` / `disallowedTools`** blocks listed tools, regardless of other settings. See [Permissions](/do… Configure your agent Claude Code CLI · in the page agent-sdk/configuration …ved | [Configure permissions](/docs/en/agent-sdk/permissions.md) | | `canUseTool` | `can_use_tool` | Your approval callback for tool calls | [Handle tool approval requests](/docs/en/agent-sdk/user-inp… Intercept and control agent behavior with hooks Claude Code CLI · in the page agent-sdk/hooks …ion) once a permission request has waited about six seconds on your [`canUseTool` callback](/docs/en/agent-sdk/user-input). Requires TypeScript Agent SDK v0.3.233 or later, or Python Agent SDK v0.2.13… Configure permissions Claude Code CLI · in the page agent-sdk/permissions …ion modes and rules to define what's allowed automatically, and the [`canUseTool` callback](/docs/en/agent-sdk/user-input) to handle everything else at runtime. ## How permissions are evaluated When… Agent SDK reference - Python Claude Code CLI · in the page agent-sdk/python …ted stderr: Callable[[str], None] | None = None can_use_tool: CanUseTool | None = None hooks: dict[HookEvent, list[HookMatcher]] | None = None user: str | None = None include_parti… Extend agents with skills Claude Code CLI · in the page agent-sdk/skills …rs. For the full permission flow, including permission modes and the `canUseTool` callback, see [Permissions](/docs/en/agent-sdk/permissions.md). ## Troubleshooting ### Skills not found **Check set… Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …on yet. Everything a claim can't set, such as `mcpServers`, `hooks`, `canUseTool`, `settingSources`, `systemPrompt`, and `plugins`, is fixed for the life of the spare, so keep one spare per distinct s… Handle approvals and user input Claude Code CLI · in the page agent-sdk/user-input …ying questions** (via the `AskUserQuestion` tool). Both trigger your `canUseTool` callback, which pauses execution until you return a response. This is different from normal conversation turns where C… Environment variables Claude Code CLI · in the page env-vars …ication) in sessions where Claude Code sends them to the Agent SDK's `canUseTool` callback, which is how Claude Desktop and the VS Code extension host Claude Code. Has no effect in terminal sessions.… Run Claude Code programmatically Claude Code CLI · in the page headless …s most when your run has a permission host: an Agent SDK app with a [`canUseTool` callback](/docs/en/agent-sdk/user-input), or an MCP tool you pass with [`--permission-prompt-tool`](/docs/en/cli-refer… Hooks reference Claude Code CLI · in the page hooks …mpts-in-unattended-runs) to receive the prompt, such as an Agent SDK `canUseTool` callback. A `PreToolUse` hook satisfies that requirement when it does the following: 1. Reads the tool's input from… Connect Claude Code to tools via MCP Claude Code CLI · in the page mcp …ction; not supported via --permission-prompt-tool`. The Agent SDK's [`canUseTool` callback](/docs/en/agent-sdk/permissions) does receive these calls and can approve them, because your SDK application… Monitoring Claude Code CLI · in the page monitoring-usage …itself fails. For example, that request fails when the Agent SDK's [`canUseTool`](/docs/en/agent-sdk/typescript#canusetool) callback or the [`--permission-prompt-tool`](/docs/en/cli-reference#cli-fla… Choose a permission mode Claude Code CLI · in the page permission-modes …pproval are denied unless you approve them with an allow rule, hook, `canUseTool` callback, or `--permission-prompt-tool`. To get these calls approved, add allow rules or start in auto mode: * **[Ad… Configure permissions Claude Code CLI · in the page permissions …ission-prompt-tool`](/docs/en/cli-reference#cli-flags) or Agent SDK [`canUseTool` callback](/docs/en/agent-sdk/user-input#handle-tool-approval-requests) would be asked about is still put to that tool… Manage mods for your organization Claude Code CLI · in the page plugins/mods/admin …ion-prompt-tool`](/docs/en/cli-reference#cli-flags) or an Agent SDK [`canUseTool` callback](/docs/en/agent-sdk/user-input#handle-tool-approval-requests). There the classifier checks the call first. Fo… Orchestrate subagents at scale with dynamic workflows Claude Code CLI · in the page workflows …-tool`](/docs/en/cli-reference#cli-flags) or, with the Agent SDK, a [`canUseTool`](/docs/en/agent-sdk/permissions) callback approves it. In the Desktop app, an approval card shows the workflow name,…