Feature request: PostResponse / AssistantMessage hook event

Problem

Claude Code hooks currently support Stop, PreToolUse, PostToolUse, and Notification events. There is no hook event that fires after each assistant response within a session.

This makes it impossible to build integrations that react to every response, such as:

• Text-to-speech: Speaking Claude's response aloud after each message (not just at session end)
• Desktop notifications: Alerting when Claude finishes a long response while you're in another window
• Logging/analytics: Tracking individual response times or content
• Accessibility tools: Screen reader integration, haptic feedback, etc.

Proposed solution

Add a new hook event — PostResponse, AssistantMessage, or similar — that fires after each assistant turn. The hook payload should include:

• The assistant's response text (or a summary/truncation for large responses)
• The conversation turn number
• Whether tools were used in the response

Context

I built jean-claude, a Stop hook that gives Claude a voice using ElevenLabs TTS. It works great at session end, but users want to hear Claude speak after every response. The only blocker is the lack of a per-response hook event.

Workarounds considered

• PostToolUse only fires on tool calls, not plain text responses
• Stop only fires once at session end
• No combination of existing hooks covers "after every assistant message"