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Per-turn diff review (checkpoint-to-checkpoint), with unified and split views #148
Description
What T3 Code does
Every turn is bracketed by hidden-git-ref checkpoints and the UI shows the diff of each turn, in unified and split views (internals).
Solenta today
The data already exists: per-turn auto-commits (coder-checkpoint: turn N) and per-checkpoint-pair shortstats (src/shared/ipc.ts:1146-1177). But the UI renders only shortstat review bars (src/components/ThreadView.tsx:201) plus one whole-worktree unified diff (src/components/ThreadView.tsx:1458-1466, tinted lines, truncated). No per-turn patch view, no split view.
Why it matters
Reviewing agent output turn-by-turn localizes mistakes to the turn that caused them; a 40-file cumulative diff hides that. Solenta already pays the git cost, so this is mostly UI work.
Activity
currentbits commentedon Aug 17, 2026
Deep-dive correctness recipe (Waku): per-turn diff attribution needs three refs per turn (start/end/diff-base), a turn-START snapshot distinct from the prior turn-end, and git merge-tree --write-tree for a virtual branch start so per-turn diffs contain only what the agent actually did — even across mid-turn branch switches. Plus isolated-index snapshotting (temp GIT_INDEX_FILE) so snapshots never disturb the user's staging area.
currentbits commentedon Aug 18, 2026
Research note (Zed): git.diff_base-style merge-base diffing — show worktree changes vs the DEFAULT BRANCH'S MERGE BASE, not HEAD. For long-lived threads where main has moved on, this is the diff the reviewer actually wants.
currentbits commentedon Aug 18, 2026
Round 27 intel: Orca's Annotate AI Diff is the tightest version of the review-to-agent loop seen so far: leave comments on any lines of the agent's diff, then send them all back to the agent in one batch to revise. No copying line numbers into the composer; the review comments are the follow-up prompt, with file/line context attached automatically. For Solenta's per-turn diff review: the comment UI should live on the diff itself, and "send annotations to agent" should be the primary action, not a copy-paste workflow. Pairs with #278 (inter-diff review) for the multi-round case.
currentbits commentedon Sep 10, 2026
Per-turn checkpoint diffs: git.turnDiff plus unified/split panel on the review bar. Git pane remains the cumulative working-tree view.