# R5 plan consensus

Date: 2026-09-15. Research base: `9ebe81c1b3611f9cc73e676b5b741c2be62c467a`.

## Accepted plan

- Version: **v2**, `plan-v2.md`.
- SHA256: `5a782acf3f285b23d1ae43a73481c4eb772a9a6d917fc5a550ecfc7cbf7446ca`.
- Actual reviewer: **claude-opus-5**, explicitly invoked **--effort max** through `/opt/homebrew/bin/claude` 2.1.270. All assistant messages in both reviews identify this model. The auxiliary Haiku usage in CLI bookkeeping is separately retained in modelUsage and is not the reviewer.
- Actual result: **APPROVE_WITH_NONBLOCKING_NOTES; 0 blocking items** in opus-v2-review.md.
- Codex accepts this exact v2 and its bounded per-hop scope. Plan hash was checked locally immediately before implementation. Opus's read-only tools did not run hashing; the original caveat is retained in raw review.
- Workflow permission: after this written consensus, local implementation and verification proceed without another user approval. No main merge, remote push, release, deployment or production state rewrite.

## Discussion and resolved differences

V1 was REQUEST_CHANGES with five blockers. See opus-v1-response.md for individual treatment and source evidence. V2 resolves all five. Opus explicitly withdrew its empty-only transfer proposal after the same-value re-addition counterexample, corrected its KMS COPY statement after inspecting bucket-default/auto encryption, and accepted that per-pool-only local clock guards are insufficient for ordinary source reads.

## Nonblocking notes accepted during implementation

- Extra metadata I/O occurs on scheduled metadata/heal/existing-object work with a recorded revision; ordinary object replication dispatches straight to full transfer. Completed scanner gates and incoming replication suppression avoid a feedback loop. Test the incoming no-reschedule decision.
- Pin unchanged object ModTime for local tagging changes.
- Keep a single-set monotonic guard and one uniform multi-pool candidate; direct-to-set writes outside the pool lock can transiently differ and re-converge on the next pooled mutation.
- Check actual failed COPY status/action and subsequent retry. Malformed timestamps fail both PUT and metadata COPY construction.
- Preserve scope limitations: tag-filter target selection, historical missing revisions, arbitrary unversioned content overwrites, and real multi-site/host-clock skew are not solved or production-accepted here.

## R4 dependency

Reuse reviewed local R4 commit `dbcf8dec589deb5d91e17d295cb70997635f5b55` on this isolated branch before implementation. Its only production change is the KMS options field, already examined against the provided patch SHA256 `2d4806d986bbd94ba4bc3951f3aeee48401ee1921c28ded0988fa09ca76ca26f`. R5 does not reimplement or modify that field. This makes R4+R5 tests run on actual combined source, with R5's eventual commit measured against the R4 dependency.

## Raw records

`/Users/vonng/tmp/silo-r5-20260915-77ad/opus-v1.jsonl`, `opus-v1.stderr.log`, `opus-v1-request.json`, and matching `opus-v2.*`. In-repository review texts, prompts and metadata preserve plan hashes, model identity, usage and verdicts. V1 failure is not treated as approval.