23 pages for posttooluse.

migration Claude Developer Platform · in the page managed-agents/migration …| | `PreToolUse` / `PostToolUse` hooks | Your client already sees every `agent.custom_tool_use` event before responding; put the logic there. For buil… How the agent loop works Claude Code CLI · in the page agent-sdk/agent-loop …ecutes | Validate inputs, block dangerous commands | | `PostToolUse` | After a tool returns | Audit outputs, trigger side effects | | `UserPrompt… Intercept and control agent behavior with hooks Claude Code CLI · in the page agent-sdk/hooks …tool is about to be called (`PreToolUse`), a tool returned a result (`PostToolUse`), a subagent started or stopped, the agent is idle, or execution finished. See the [full list of events](#available-h… Agent SDK reference - Python Claude Code CLI · in the page agent-sdk/python …ent = Literal[ "PreToolUse", # Called before tool execution "PostToolUse", # Called after tool execution "PostToolUseFailure", # Called when a tool execution fails "UserPromptSubmit… Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …as this message, with each line prefixed by the hook's name, such as `PostToolUse:Bash says:`. Whether a hook's `systemMessage` arrives as this message depends on the event. Each [event's section](/do… Claude Code changelog Claude Code CLI · in the page changelog …et the session title in auto mode * Fixed focus mode showing "Ran N PostToolUse hooks" timing lines under each response </Update> <Update label="2.1.181" description="June 17, 2026"> * Added `/co… Claude apps gateway configuration Claude Code CLI · in the page claude-apps-gateway-config …must exist on every client OS in the policy. hooks: PostToolUse: - matcher: "Edit|Write" hooks: - { type: command, command: /usr/local/bin/a… Explore the .claude directory Claude Code CLI · in the page claude-directory …], "deny": [ "Bash(rm -rf *)" ] }, "hooks": { "PostToolUse": [{ "matcher": "Edit|Write", "hooks": [{ "type": "command", "command": "jq -r '.tool_inpu… Explore the context window Claude Code CLI · in the page context-window …tokens: 120, color: '#B8860B', vis: 'hidden', desc: 'A PostToolUse hook in `settings.json` runs prettier after every file edit and reports back via `hookSpecificOutput.additionalContext… Extend Claude Code Claude Code CLI · in the page features-overview …ggered by** | [Lifecycle events](/docs/en/hooks#hook-events) such as `PostToolUse` or `SessionStart` | You typing `/<name>`, or Claude matching the description to your task | | **Determinism** |… Hooks reference Claude Code CLI · in the page hooks …lure` * on every tool call inside the agentic loop: `PreToolUse` and `PostToolUse`, except [`EndConversation`](/docs/en/tools-reference#endconversation-tool-behavior) calls, which skip both <div styl… Automate actions with hooks Claude Code CLI · in the page hooks-guide …ks` object: ```json theme={null} { "hooks": { "PostToolUse": [ { "matcher": "Edit|Write", "hooks": [{ "type": "command", "command": "jq -r '.to… Monitoring Claude Code CLI · in the page monitoring-usage …session * `hook_event`: hook event type, such as `"PreToolUse"` or `"PostToolUse"` * `hook_type`: hook implementation type: `"command"`, `"prompt"`, `"mcp_tool"`, `"http"`, or `"agent"` * `hook_sourc… Choose a permission mode Claude Code CLI · in the page permission-modes …an't manipulate it directly. You can annotate a call's result with a [PostToolUse hook's `classifierContext` field](/docs/en/hooks#annotate-a-result-for-the-auto-mode-classifier), which the classifier… Create and distribute a plugin marketplace Claude Code CLI · in the page plugin-marketplaces …ty-reviewer.md", "./agents/compliance-checker.md"], "hooks": { "PostToolUse": [ { "matcher": "Write|Edit", "hooks": [ { "type": "command",… Create plugins Claude Code CLI · in the page plugins …event each hook matches, such as asking Claude to edit a file for a `PostToolUse` hook, and confirm its effect. Claude Code records which hooks matched, their exit codes, and their output in the [deb… Plugins reference Claude Code CLI · in the page plugins-reference …ns **Hook configuration**: ```json theme={null} { "hooks": { "PostToolUse": [ { "matcher": "Write|Edit", "hooks": [ { "type": "command",… Catch security issues as Claude writes code Claude Code CLI · in the page security-guidance …working-tree baseline that the end-of-turn review diffs against | | `PostToolUse` on `Edit`, `Write`, and `NotebookEdit` | Per-edit pattern match… Customize sessions in self-hosted environments Claude Code CLI · in the page self-hosted-environments-configuration …on, snapshot periodically from inside the session with a Claude Code `PostToolUse` hook instead. The runner sets: | Variable | Description… Configure server-managed settings Claude Code CLI · in the page server-managed-settings …ganization: ```json theme={null} { "hooks": { "PostToolUse": [ { "matcher": "Edit|Write", "hooks": [ { "type": "command", "comman… Create custom subagents Claude Code CLI · in the page sub-agents …hat also fire inside subagents. Tool events such as `PreToolUse` and `PostToolUse` fire for the subagent's tool calls the same way they do in the main conversation, and `SubagentStart` and `SubagentSt… Week 18 · April 27 – May 1, 2026 Claude Code CLI · in the page whats-new/2026-w18 …an find a skill in a long list without scrolling</div> <div><code>PostToolUse</code> hooks can replace tool output for any tool via <code>hookSpecificOutput.updatedToolOutput</code>, not only MCP… Week 20 · May 11–15, 2026 Claude Code CLI · in the page whats-new/2026-w20 …iv> <div>New <code>continueOnBlock</code> config option for <code>PostToolUse</code> hooks feeds the hook's rejection reason back to Claude and continues the turn instead of ending it</div> <d…