[Jish2]

What

Adds fleet.autoHandoff (modules/darwin/auto-handoff) and enables it on mini.

Reopening a T3 thread after its 1-hour prompt cache expires re-bills its whole context. Every 5 minutes, the LaunchAgent org.jgoon.auto-handoff reads Claude Code's session logs. When a T3 Claude thread has been idle 40–50 minutes with at least 60k tokens of context, it POSTs a signed request to a T3 webhook task. That task's Haiku agent asks the thread to write a handoff doc to ~/.handoffs/<project>/ while the cache is still cheap to read. The watcher itself makes no model calls.

/catch-up (the catch-up skill in Jish2/skills, already synced) reads these docs, and also covers machines without the watcher.

Before merging / switching

Do the one-time setup in FLEET.md "Auto-handoff" first: a signing secret in the Keychain, a Haiku relay thread with the webhook task, and the webhook URL in the Keychain. Without it, the agent logs missing webhook url/secret every 5 minutes and sends nothing.

Notes

• It's a LaunchAgent, not a daemon, because T3's own service is a LaunchAgent and the URL and secret live in the login Keychain. No secrets in the repo.
• The watcher imports handoffs.py from ~/.claude/skills/catch-up/scripts (the synced skill).
• Mapping a session to its thread reads T3's private state DB read-only. If a T3 update changes the schema, it logs "no T3 thread found" and sends nothing.
• Moved here from ~/github/session-handoff, which can be deleted after merge.

Checked

• nix eval of the mini agent's serviceConfig, and nix build --dry-run .#darwinConfigurations.mini.system.
• A dry run of the store copy of the script on mini against real sessions.
• Not switched: nothing has been applied to mini.

🤖 Generated with Claude Code

[claude]

Claude review: no issues found

Checked the full diff (auto_handoff.py, the nix module, flake/mini wiring, relay prompt, FLEET.md) for bugs and CLAUDE.md compliance (no CLAUDE.md in repo). No earlier reviews or comments existed.

Approved: all approval conditions held.

[claude]

Self-contained opt-in watcher; no bugs found, no .github/ or install.sh changes.

[claude]

Claude review: no issues found

Read the full diff (auto_handoff.py, nix module, flake/mini wiring, relay prompt, FLEET.md) for bugs and CLAUDE.md compliance (no CLAUDE.md in repo); the earlier Claude review had no open findings and nothing else has been raised.

Approved: all approval conditions held.

[claude]

Self-contained opt-in watcher; no bugs found, no .github/ or install.sh changes.

[claude]

Claude review: no issues found

Read the full diff (auto_handoff.py, nix module, flake/mini wiring, relay prompt, FLEET.md) for bugs and CLAUDE.md compliance (no CLAUDE.md in repo). The change since the last review is the added User-Agent header in the webhook request, which is correct. The earlier Claude reviews had no open findings.

Approved: all approval conditions held.

[claude]

Self-contained opt-in watcher; the new User-Agent header is correct, no bugs found, no .github/ or install.sh changes.