{
  "video": "video-274cd125.mp4",
  "description": "This video is a detailed walkthrough of a comprehensive **Hook Events** documentation table, likely related to an AI agent or platform framework. The table outlines various lifecycle events that can occur during an agent's operation and specifies *when* each event fires.\n\nThe video progresses through the table section by section, explaining the purpose and timing of each hook.\n\nHere is a detailed breakdown of the segments covered:\n\n### 00:00 - 00:01: Core Agent Lifecycle Hooks\nThe initial section covers the basic operational flow of the agent:\n*   **`SessionStart`**: Fires when a new session begins or resumes.\n*   **`UserPromptSubmit`**: Fires when the user submits a prompt, before Claude processes it.\n*   **`PreToolUse`**: Fires before the AI calls external tools, allowing for blocking.\n*   **`PermissionRequest`**: Fires when a permission dialog appears.\n*   **`PermissionDenied`**: Fires when a permission request is denied by the auto mode classifier, allowing for retries.\n*   **`PostToolUse`**: Fires after a tool call successfully completes.\n*   **`PostToolUseFailure`**: Fires after a tool call fails.\n*   **`Notification`**: Fires when Claude sends a notification.\n*   **`SubagentStart`**: Fires when a subagent is spawned.\n*   **`SubagentStop`**: Fires when a subagent finishes.\n*   **`TaskCreated`**: Fires when a task is being created via `TaskCreate`.\n\n### 00:01 - 00:02: Task and Execution Flow Hooks\nThis section dives deeper into task management and the agent's response cycle:\n*   **`TaskCompleted`**: Fires when a task is marked as completed.\n*   **`Stop`**: Fires when Claude finishes responding (the agent stops).\n*   **`StopFailure`**: Fires when the turn ends due to an API error, and the output/exit code is ignored.\n*   **`TeammateIdle`**: Fires when an agent teammate is about to go idle.\n*   **`InstructionsLoad`**: Fires when configuration files are loaded into the context, which is crucial for session setup.\n\n### 00:02 - 00:03: Context and Configuration Loading Hooks\nThe focus shifts to file and configuration management:\n*   **`ConfigChange`**: Fires when a configuration file changes during a session.\n*   **`FileChanged`**: Fires when a watched file changes on disk.\n*   **`WorktreeCreated`**: Fires when a working tree is created, often related to file operations.\n*   **`WorktreeRemoved`**: Fires when a working tree is removed, either at session exit or after a subagent finishes.\n*   **`PreCompact`**: Fires before context compaction begins.\n*   **`PostCompact`**: Fires after context compaction completes.\n*   **`Elicitation` / `ElicitationResult`**: Hooks related to the Model/API Call Process (MCP), indicating when a request is sent out or when the response is received.\n\n### 00:03 - 00:04: Detailed File Watching and Agent State Hooks\nThis section continues to detail file and working tree management:\n*   **`ConfigChange`** (revisited): Details the usage of the `matcher` field for specific file changes.\n*   **`FileChanged`** (revisited): Again details the use of the `matcher` field for specific filename watching.\n*   **`WorktreeCreated`** (revisited): Re-explains the `matcher` or `isolation` fields.\n\n### 00:04 - 00:07: Workflow Refinements and Errors\nThe final segment covers more granular operational hooks:\n*   **`WorktreeRemoved`** (revisited): Re-explains the scope of removal (session exit or subagent finish).\n*   **`PreCompact` / `PostCompact`** (revisited): Re-explains their timing relative to context operations.\n*   **`Elicitation` / `ElicitationResult`** (revisited): Provides context on the MCP (Model/API Call Process) hooks, emphasizing that they track the round trip for external requests.\n*   **`SessionEnd`**: The final hook, firing when a session terminates.\n\n**In summary, the video serves as a comprehensive technical tutorial, systematically explaining a sophisticated event system used to track and intercept every significant phase of an AI agent's execution, from user input to file manipulation and session shutdown.**",
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}