12 pages for userpromptsubmit.

How the agent loop works Claude Code CLI · in the page agent-sdk/agent-loop …se` | After a tool returns | Audit outputs, trigger side effects | | `UserPromptSubmit` | When a prompt is sent | Inject additional context into prompts | | `Stop` | When the agent finishes | Validate… Intercept and control agent behavior with hooks Claude Code CLI · in the page agent-sdk/hooks …e next model call | Inject conventions once for the whole batch | | [`UserPromptSubmit`](/docs/en/hooks#userpromptsubmit) | Yes | Yes | A prompt is submitted, including a turn Claude Code starts on it… Modifying system prompts Claude Code CLI · in the page agent-sdk/modifying-system-prompts …[`additionalContext`](/docs/en/hooks#add-context-for-claude) from a `UserPromptSubmit` or `PostToolUse` [hook callback](/docs/en/agent-sdk/hooks#outputs), written as a factual statement such as "The… Agent SDK reference - Python Claude Code CLI · in the page agent-sdk/python …"PostToolUseFailure", # Called when a tool execution fails "UserPromptSubmit", # Called when a prompt is submitted "Stop", # Called when stopping execution "SubagentStop", # Calle… Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …n-error status lines Claude Code raises, and hook feedback such as a `UserPromptSubmit` hook's block reason. On Claude Code v2.1.227 or later, a hook's [`systemMessage`](/docs/en/hooks#json-output) c… Claude Code changelog Claude Code CLI · in the page changelog …urn a timeout error when still unanswered after 11 minutes * Changed `UserPromptSubmit` hooks to run before a skill or custom slash command expands, so a hook that blocks the prompt now also stops its… Hooks reference Claude Code CLI · in the page hooks …adences: * per session: `SessionStart` and `SessionEnd` * per turn: `UserPromptSubmit`, `Stop`, and `StopFailure` * on every tool call inside the agentic loop: `PreToolUse` and `PostToolUse`, except… Automate actions with hooks Claude Code CLI · in the page hooks-guide …tenance` in `-p` mode. For one-time preparation in CI or scripts | | `UserPromptSubmit` | When a prompt is submitted, before Claude processes it. Also fires on [turns Claude Code starts on its own](/d… Interactive mode Claude Code CLI · in the page interactive-mode …-options` keeps counting down. * **The continuation is blocked**: a [`UserPromptSubmit` hook](/docs/en/hooks#userpromptsubmit) that blocks the continuation prompt, or a failure before it reaches the m… Catch security issues as Claude writes code Claude Code CLI · in the page security-guidance …- | | `SessionStart` | Bootstrap the plugin's Python environment | | `UserPromptSubmit` | Capture the working-tree baseline that the end-of-turn review diffs against | | `PostToolUse` on `Edit`, `Writ… Week 15 · April 6–10, 2026 Claude Code CLI · in the page whats-new/2026-w15 …xes, `/dev/tcp` redirects, and compound commands now prompt correctly`UserPromptSubmit` hooks can set the session title via `hookSpecificOutput.sessionTitle` [Full changelog for v2.1.92–v2.1.101 →](/… MCP, plugins, skills, and hooks Claude Documentation · in the page third-party/claude-desktop/extensions …the home screen runs the same hooks as any other Cowork session. A `UserPromptSubmit` hook that blocks a prompt stops that turn and shows the hook's reason to the user. When a conversation or sessio…