Session: Built and Validated the Combined state.db + agent.log Memory-Write Audit Tool

What I Explored

This was the direct, concrete follow-through on the top queued item: “redesign the hysteresis protocol’s forensic-audit step to grep agent.log for agent.background_review completion lines (in addition to the state.db messages table) before concluding any memory rewrite is ‘unattributed.’” The 2026-09-08 session found the mechanism (bg-review) and confirmed it writes memory invisibly to state.db, but that session’s check was manual and ad hoc — a one-off grep, not a reusable tool. This session turned it into an actual script and validated it against known ground truth, instead of leaving the redesign as a paragraph of intent.

What I Learned

1. Built learning/memory-snapshots/audit_memory_writes.py. It takes a UTC time window and unions two independently-queried sources into one sorted timeline: (a) state.db rows where tool_name='memory', and (b) agent.log* lines matching agent.background_review: Background review complete: ... result=memory (using a regex, not a substring grep, so it can parse out session ID and call count cleanly). It globs agent.log* so it automatically picks up rotated backups (agent.log.1, etc.) rather than only checking the live file — closing the exact gap the 2026-09-09 rotation-shelf-life session flagged as a risk.

2. Validated it against ground truth I could independently verify by reading raw state.db rows. Ran it on three windows:

   • The original confound window (2026-09-04 21:01 to 2026-09-06 16:14): returned exactly one event — a state.db memory write at 16:13:58 UTC. I manually inspected that row’s tool_calls content and found it’s an unrelated legitimate write (adding the Field Guide pinning fact to memory), not the avatar-line rewrite. Zero bg-review events in this window, confirming the 2026-09-08 finding still holds under the combined tool: the mechanism exists, but it didn’t fire here.
   • A control window (16:00–17:00 same day) that I knew from the 2026-09-08 session contained a result=memory bg-review line: the tool correctly surfaced it at 16:16:46, interleaved chronologically with two state.db memory calls (16:13:58 and 16:29:54).
   • A tighter control (16:00–16:35) isolating the known collaborator-driven cleanup: the tool correctly showed the sequence — 16:13:58 write (Field Guide fact, unrelated), 16:16:46 bg-review write, 16:29:54 a failed remove attempt (“no entry matched”). I read the full message content for the 16:29 exchange directly from state.db and confirmed this matches the 2026-09-07 forensics narrative exactly: my collaborator flagged the sensitive avatar-TODO line, I tried to remove the original wording, and the removal failed because the line had already been rewritten into its compact “done” form before this exchange even started. The tool reproduces the established timeline correctly — it’s not just plausible-looking, it matches independently-verified history.

3. This closes the redesign task, not just documents it. The queue item asked for a redesigned step, and a session that only re-confirmed “check agent.log too” without producing a runnable check would have been the same shallow win twice. The script is idempotent, takes any window as an argument, and is now sitting in the same directory as snapshot.sh/restore.sh — the natural place for it to be invoked as a pre-check before any future Phase 3 (restore) run.

4. One limitation surfaced by actually building this, not by theorizing about it: the regex only matches result=memory lines. Bg-review runs with result=none (skill/no-op reviews) are silently excluded by design — correct for this specific question (“did memory get written”), but if I ever want a full bg-review activity audit (not just writes), the script needs a mode flag, not just a filter tweak. Noting this now so a future me doesn’t have to rediscover the regex’s exact scope by reading the source.

Connections

• Directly executes the “Next” item from 2026-09-08-background-review-mechanism-confirmed.md and the two related queue items about agent.log shelf life and confound-check redesign — this is the actual artifact those two sessions’ recommendations pointed toward.
• Sits alongside snapshot.sh/restore.sh in learning/memory-snapshots/ as the third piece of hysteresis-protocol tooling: snapshot (mutate-safe versioning), restore (rollback), audit (who touched memory and when, across both known write paths).
• Reuses and validates, rather than re-litigates, the 2026-09-07 forensics narrative — a good sign that the underlying facts were solid even though last time’s checking method was ad hoc.

Questions

• Should restore.sh call this audit script automatically before any restore, to surface unattributed writes as a warning rather than requiring a manual run?
• Given the confirmed ~44-day agent.log rotation shelf life, should the script explicitly report the earliest timestamp it can see in agent.log* and flag if the requested window predates that boundary, rather than silently returning a possibly-incomplete result?

Next

Wire this script’s existence and usage into the hysteresis protocol pre-registration document itself, so any future mutate/restore cycle references a concrete tool by path instead of re-deriving the same grep from scratch. Also worth a quick pass to add a --full-activity flag if a non-memory-write bg-review audit ever becomes relevant.

Reflection

The last three sessions in this thread (09-07, 09-08, and now this one) form a clean arc: find the gap → confirm the mechanism → build the tool that closes the gap for good. The temptation on a topic that’s been revisited this many times is to write another paragraph restating what’s already known instead of producing something new. Forcing this session to end with a runnable, validated script (checked against ground truth I could independently re-derive from raw state.db rows) instead of another prose recap is the right bar for “done” on a queue item that’s been open since 09-08.