Claude Mods

Claude Code Hook

• Claude Code Subagents SubagentStop: Runs when subagent tasks complete

• PreToolUse: Runs before tool calls (can block them)

• PermissionRequest: Runs when a permission dialog is shown (can allow or deny)

• PostToolUse: Runs after tool calls complete

• UserPromptSubmit: Runs when the user submits a prompt, before Claude processes it

• Notification: Runs when Claude Code sends notifications

• Stop: Runs when Claude Code finishes responding

• PreCompact: Runs before Claude Code is about to run a compact operation
• recommendation: hook before summarization, update memory, state

• SessionStart: Runs when Claude Code starts a new session or resumes an existing session

• SessionEnd: Runs when Claude Code session ends

Hook

• Notifications

• Formatting

• Logging

• Feedback

Get started with Claude Code hooks - Claude Code Docs

Learn how to customize and extend Claude Code's behavior by registering shell commands

https://code.claude.com/docs/en/hooks-guide

Hooks reference - Claude Code Docs

This page provides reference documentation for implementing hooks in Claude Code.

https://code.claude.com/docs/en/hooks

Cowork & Code GUI

• [BUG] Cowork sessions ignore user hooks and managed settings — sandbox platform mismatch breaks all settings resolution

  Updated 2026 Aug 13 17:14

• [FEATURE] Support SessionStart hooks in Cowork (Claude Desktop App)

  Updated 2026 Apr 22 14:51

• [FEATURE] Support SessionStart hooks in Cowork (Claude Desktop App)

  Updated 2026 Apr 22 14:51

• Post/PreToolUse Hooks Not Executing in Claude Code

  Updated 2026 Aug 22 18:23

• [BUG] Plugin hooks registered but not firing in VSCode extension

  Updated 2026 Aug 25 14:26

• [Bug] Hooks from settings.json never invoked in Claude Desktop App (server/API mode, stream-json, Windows)

  Updated 2026 May 18 8:22

• [FEATURE] Plugin/hook system parity for Claude Desktop app (Code/Cowork)

  Updated 2026 Apr 19 14:29

• [BUG] Cowork: Plugin hooks from hooks/hooks.json never fire — --setting-sources user excludes plugin scope

  Updated 2026 Mar 4 14:29

Mods

Boris Cherny on Twitter / X

Claude Mods are landing now. Someone already built a Tetris-in-Claude mod 🤯See issue for the latest community update, technical details, and more cool demoshttps://t.co/A15qGUZ6nx pic.twitter.com/EbE2s7FZqK— Boris Cherny (@bcherny) September 14, 2026

https://x.com/bcherny/status/2099551291601248485