Entire

/simplify → 4 cleanup agents in parallel → apply the fixes

You are improving the quality of the changed code, not hunting for bugs. Review it for reuse, simplification, efficiency, and altitude issues, then fix what you find. Do not look for correctness bugs — that is what /code-review is for.

Phase 0 — Gather the diff

Run git diff @{upstream}...HEAD (or git diff main...HEAD / git diff HEAD~1 if there's no upstream) to get the unified diff under review. If there are uncommitted changes, or the range diff is empty, also run git diff HEAD and include the working-tree changes in scope — the review often runs before the commit. If a PR number, branch name, or file path was passed as an argument, review that target instead. Treat this diff as the review scope.

Phase 1 — Review (4 cleanup agents in parallel)

Launch 4 independent review agents via the Agent tool, all in a single message so they run concurrently. Pass each agent the diff and one of the four angles below. Each returns its findings with file, line, a one-line summary, and the concrete cost (what is duplicated, wasted, or harder to maintain).

Reuse

Flag new code that re-implements something the codebase already has — Grep shared/utility modules and files adjacent to the change, and name the existing helper to call instead.

Simplification

Flag unnecessary complexity the diff adds: redundant or derivable state, copy-paste with slight variation, deep nesting, dead code left behind. Name the simpler form that does the same job.

Efficiency

Flag wasted work the diff introduces: redundant computation or repeated I/O, independent operations run sequentially, blocking work added to startup or hot paths. Also flag long-lived objects built from closures or captured environments — they keep the entire enclosing scope alive for the object's lifetime (a memory leak when that scope holds large values); prefer a class/struct that copies only the fields it needs. Name the cheaper alternative.

Altitude

Check that each change is implemented at the right depth, not as a fragile bandaid. Special cases layered on shared infrastructure are a sign the fix isn't deep enough — prefer generalizing the underlying mechanism over adding special cases.

Phase 2 — Apply the fixes

Wait for all four agents to complete, dedup findings that point at the same line or mechanism, and fix each remaining one directly. Skip any finding whose fix would change intended behavior, require changes well outside the reviewed diff, or that you judge to be a false positive — note the skip rather than arguing with it. Finish with a brief summary of what was fixed and what was skipped (or confirm the code was already clean).

3mo ago·8m

Build, vet, and focused tests pass. Here's the summary.

Fixed

Duplicated temporary-store extraction (3 sites) — SaveStep, SaveTaskStep (manual_commit_git.go), and GetRewindPoints (manual_commit_rewind.go) each repeated stores, err := s.getCheckpointStores(...) followed by store := stores.Temporary(). Added a getTemporaryStore helper in manual_commit.go that mirrors the existing getCheckpointStore, so each site is now a single store, err := s.getTemporaryStore(ctx, repo). getCheckpointStores stays as the shared Open+blob-fetcher wrapper used by both typed accessors — no duplication, and the committed/temporary accessor pair is now symmetric.

Skipped (verified false positives or out of scope)

attributionSessionMetadataPromptsReader "duplicates CommittedStore" (flagged by 3 agents) — it doesn't. CommittedStore is much wider (it embeds CommittedListReader and CommittedWriter). The local interface is a narrow, read-only consumer interface — the idiomatic Go shape. Replacing it with CommittedStore would broaden attribution's dependency surface to include write methods it never calls, which is worse. (The near-identical interface in review_context.go is also out of the diff scope.)
open.go dual Primary/temporary fields pointing at the same object — this is the deliberate point of the split: two capability-typed views of one backing store. Collapsing to a runtime type assertion (s.Primary.(TemporaryStore)) trades explicit, panic-free typing for indirection. Kept as-is.
explain.go AuthorReader type assertion — efficiency and altitude agents both concluded it's justified: author lookup is genuinely optional, with a graceful git-commit fallback. Not a bandaid.
//nolint:ireturn annotations — intentional; returning the capability interfaces is the abstraction boundary this PR establishes.

No commits made — changes are in the working tree for your review.