# Antigravity implementation review: recursive loop contract

**Reviewer:** Antigravity AI Coding Assistant

**Date:** 2026-07-16

**Verdict:** **PASS for merge readiness after support-package publication**

## Settled implementation revisions

- loopy-loop: `57ffa30b0db5d130313446bad0141cee530f7387`
- team-harness: `217351f3dec830441e74e02b1c196e106e253753`
- eval-banana: `c979f70fedd0e9ebc02f4b8e33cd3868d52b6c37`

Antigravity reviewed the complete implementation and then reviewed only the final
team-harness shutdown-grace follow-up. Both reviews were read-only and returned PASS
with no blocker.

## Findings confirmed fixed

Antigravity confirmed that:

1. top-level state discovery rejects scratch directories and copied or mismatched
   backups without a valid self-binding root manifest, without losing legacy v1
   compatibility;
2. trace resolution ignores unrelated malformed identities but rejects duplication of
   the selected valid identity;
3. explicit workflow contracts without a protocol field select v2, while only the
   no-contract compatibility path derives v1;
4. engine-state and attempt-frozen workflow contracts prevent projection rewrites from
   downgrading live, recovery, or later-attempt completion;
5. team-harness bounds process shutdown and retained task finalization, force-kills
   trusted unreaped groups after probe failure, settles tasks before event-loop teardown,
   and persists exact structured failure evidence plus both durable snapshots;
6. eval-banana hashes and executes the same frozen referenced-script bytes while
   preserving the script's logical runtime path behavior; and
7. assignment envelopes, parent assignment lineage, layer-local eval evidence,
   recursive unwind, D5 control, and raw ignored traces match the binding design.

The final micro-review specifically verified that the outer shutdown bound includes the
named SIGTERM grace interval. Responsive workers can therefore exit politely, while
TERM-ignoring workers retain the bounded SIGKILL fallback. It also verified the
nesting-neutral `parent_assignment_path` wording.

## Scope and validation

Antigravity found no credential detector/redactor, trace export/pruning/cloud
transport, deterministic stock eval, parallel loopy worker, fixed delegation graph,
human pause state, or preventive path fence. It confirmed docstrings and named project
arguments in the changed production surface.

The reviewed validation evidence was:

- loopy-loop: 380 tests passed;
- team-harness: 522 tests passed; and
- eval-banana: 131 tests passed.

Ruff formatting/lint and Pyright were clean. Antigravity reproduced the two known
team-harness console-test failures only under `NO_COLOR=1` and `TERM=dumb`; the branch
does not touch the console implementation, and the full suite passes with its required
color-capable environment. Ruff findings in an unrelated untracked `.agents/` tooling
directory were likewise outside the branch.

## Final disposition

Antigravity reported no remaining implementation action. Package rollout remains the
documented sequence rather than a code finding: publish eval-banana 0.3.2 and
team-harness 0.5.0, refresh loopy-loop's lock and install-path CI, then release
loopy-loop 0.7.0.
