Stop hook does not include an assistant message

[just-cameron]

The current content you get from the Stop hook is super bare-bones, can we make it easier to use? Perhaps something closer to how Claude Code does it.

Current:

    {
      "event_type": "Stop",
      "stop_reason": "end_turn",
      "message_count": 50,
      "tool_call_count": 17
    }

@letta-code wdyt

[github-actions]

Letta Code finished @cpfiffer's task —— View job • letta/issue-715-20260128-0326 • [Create PR ➔](https://github.com/letta-ai/letta-code/compare/main...letta/issue-715-20260128-0326?quick_pull=1&title=Issue%20%23715%3A%20Changes%20from%20Letta&body=This%20PR%20addresses%20issue%20%23715%0A%0AGenerated%20with%20%5BLetta%20Code%5D(https%3A%2F%2Fletta.com)

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Completed

• Gather context and understand the Stop hook implementation
• Determine what additional information to include
• Implement the enhancement
• Update tests
• Create PR

Changes made:

1. Added assistant_message field to StopHookInput interface in types.ts
2. Updated runStopHooks function to accept and pass the new parameter
3. Updated App.tsx to extract the last assistant message from buffers
4. Added test to verify the new field is included in the payload

New Stop hook payload:

{
  "event_type": "Stop",
  "stop_reason": "end_turn",
  "message_count": 50,
  "tool_call_count": 17,
  "assistant_message": "Here is the final response text..."
}

PR: #716
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[sarahwooders]

Closing as stale: no activity in 2+ weeks (cleanup on 2026-07-02). If this is still an issue, please comment or reopen and we'll take another look.

[devanshrj]

This was resolved by #719 (which added assistant_message and preceding_reasoning to the Stop hook payload) and #795 (which added user_message). The Stop hook now includes the assistant's final message, preceding reasoning, and the user's original prompt. Closing PR #716 as superseded.