Three root causes prevented Gemini sessions from persisting prompts,
observations, and summaries:
1. BeforeAgent was mapped to user-message (display-only) instead of
session-init (which initialises the session and starts the SDK agent).
2. The transcript parser expected Claude Code JSONL (type: "assistant")
but Gemini CLI 0.37.0 writes a JSON document with a messages array
where assistant entries carry type: "gemini". extractLastMessage now
detects the format and routes to the correct parser, preserving
full backward compatibility with Claude Code JSONL transcripts.
3. The summarize handler omitted platformSource from the
/api/sessions/summarize request body, causing sessions to be recorded
without the gemini-cli source tag.
Co-authored-by: Claude <noreply@anthropic.com>
Ben Younes