Session Investigator

Diagnose fast-agent session issues by examining session and history files.

Session Directory Structure

Sessions are stored in .fast-agent/sessions/<session-id>/:

2601181023-Kob2h3/
├── session.json              # Session metadata
├── history_<agent>.json      # Current agent history  
└── history_<agent>_previous.json  # Previous save (rotation backup)

Session IDs encode creation time: YYMMDDHHMM-<random> (e.g., 2601181023 = 2026-01-18 10:23).

Key Files