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perf(core): share a fair diff budget across a pull request file page - #971
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Patches of one page share 60,000 characters: small files stay whole, big ones are cut across their hunks with a note naming the page and path, lock and generated files keep a stat line. A path parameter reads one file whole. bench/pr-review-context.ts measures real commits offline.
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November 7, 2026 12:45
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In `@packages/core/src/pull-request-diff-budget.ts`:
- Around line 29: Reword `where` and the contract comment to state the 100,000-character file limit and update the exact-note assertion in `pull-request-review.test.ts`.
In `@packages/core/src/pull-request-review.ts`:
- Around line 70: Include the same `(page === 100 && values.length === 30)` condition in the `path` branch's `truncated`.
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Note Head Pull request file pages now share 60,000 patch characters across the files of a page instead of allowing 100,000 per file, so one huge patch no longer crowds out the small files after it. A cut patch ends with a note naming its page and path to fetch that file alone, while lock and generated files keep only a stat line. Comments posted: no critical or major finding. 2 minor in the review. Review details
Commands run (11)Installed with bun install --frozen-lockfile (279 packages) and ran pull-request suites: pull-request-review.test.ts 3 pass (bounded pages, huge-patch fairness, paired-phone auth), plus detection/lifecycle/rounds/watch suites all passing; bench tsconfig typecheck passed. Exercised code via tests only; no failure reproduced. Full app/bench run not completed before time expired. failed · exit 141 · 0 s ls -R | head -n 100; echo "---"; cat package.json | head -n 80; echo "---"; cat docs/development.md 2>/dev/null | head -n 120passed · exit 0 · 0 s bun --version; git log --oneline -3; git diff --stat HEAD~1 2>&1 | tail -n 20passed · exit 0 · 5 s bun install --frozen-lockfile 2>&1 | tail -n 5; echo "INSTALL_EXIT:$?"; bun test packages/core/test/pull-request-review.test.ts packages/core/test/pull-request-diff-budget.test.ts 2>&1 | tail -n 60passed · exit 0 · 2 s ls packages/core/test/pull-request* 2>&1; echo ---; bun test packages/core/test/pull-request-review.test.ts 2>&1 | tail -n 20; echo ---; bun run --cwd packages/core tsc -p ../../bench/tsconfig.json 2>&1 | tail -n 20; echo "BENCH_TSC:$?"passed · exit 0 · 27 s bun test packages/core/test/pull-request-detection.test.ts packages/core/test/pull-request-lifecycle.test.ts packages/core/test/pull-request-review.test.ts packages/core/test/pull-request-rounds.test.ts packages/core/test/pull-request-watch.test.ts 2>&1 | tail -n 15; echo "==="; cat packages/core/src/pull-request-diff-budget.ts; echo "===CONTRACT==="; cat packages/contracts/src/pull-requests.tspassed · exit 0 · 26 s bun test packages/core/test/pull-request-detection.test.ts packages/core/test/pull-request-lifecycle.test.ts packages/core/test/pull-request-review.test.ts packages/core/test/pull-request-rounds.test.ts packages/core/test/pull-request-watch.test.ts 2>&1 | grep -E "^\(|pass|fail|Ran"; echo "==="; wc -c packages/core/src/pull-request-diff-budget.ts; head -n 60 packages/core/src/pull-request-diff-budget.tspassed · exit 0 · 0 s sed -n '60,200p' packages/core/src/pull-request-diff-budget.ts; echo "===REVIEW==="; cat packages/core/src/pull-request-review.ts; echo "===RPC==="; grep -n "pullRequestFiles" -A 10 -B 5 packages/core/src/threads/rpc.ts | head -n 60passed · exit 0 · 0 s head -n 60 packages/core/src/pull-request-diff-budget.ts; echo "===CONTRACT==="; grep -n "pullRequestFiles\|PullRequestFiles" -A 12 -B 3 packages/contracts/src/pull-requests.ts | head -n 80; echo "===FAKE==="; cat packages/ui/src/lib/fake-client/pull-requests.ts; echo "===BENCH==="; head -n 100 bench/pr-review-context.tspassed · exit 0 · 0 s sed -n '1,60p' packages/core/src/pull-request-diff-budget.tspassed · exit 0 · 0 s sed -n '60,140p' packages/core/src/pull-request-diff-budget.ts; echo "===TESTaddition==="; grep -n "starves\|huge\|budget\|path" packages/core/test/pull-request-review.test.ts | head -n 20passed · exit 0 · 0 s cat packages/core/test/pull-request-review.test.ts; echo "===REVIEW-FILES==="; grep -n "files\|budgetPatches\|REVIEW" packages/core/src/pull-request-review.ts | head -n 30; echo "==="; sed -n '1,200p' packages/core/src/pull-request-review.ts | tail -n 120 |
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Note
Clanker Claude Opus 5.5 is responding on behalf of meetsu
A page of pull request files no longer lets one huge patch fill a reader's context while the small files after it get nothing.
Kind of change
What changed
threads.pullRequestFilespage now share 60,000 characters, notes included; before, each patch kept up to 100,000 (pull-request-diff-budget.ts).pathparam returns that file alone, up to 100,000 characters.bench/pr-review-context.tsrebuilds the GitHub files API pages of real squash commits from git and measures each page, with no network.docs/performance.mdrecords the numbers.To question
The budget is per page, not across the whole pull request: each page is its own call, and a reader who wants more of one file asks for it by path.
Verification
bun bench/pr-review-context.tson 2026-11-07; "before" runs the same bench on the previouspull-request-review.tsthroughBENCH_REVIEW_MODULE.pull-request-review.test.tsfails on main (181,164 characters on a page) and passes now; its long-path case fails on the first commit (64,195).bun test packages/core/test/pull-request*: 49 pass, 0 fail.bun run checkpasses.pathparam.threads.pullRequestFilesyet besides the in-memory one.Affected paths
lib/fake-client.tspackages/contracts/src/