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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - The PR workflow runs the server vitest suite across sharded runners because the suite is pinned to one worker. > - In successful PR run 30930345729 (2026-08-04), shard `server (3/4)` took 311 seconds of wall time and was the slowest check in the run. > - The suite has grown to about 946 seconds of serial vitest time, but the duration manifest was last sampled on 2026-08-01 at about 882 seconds. > - This pull request refreshes the per-suite duration manifest from that run's logs and splits the lane into five shards. > - The benefit is a shorter PR critical path: each shard carries about 196 seconds of suite time, level with the other lanes. ## Linked Issues or Issue Description Refs #10663 (previous split of this lane into four shards). Related: #10923 splits the separate serialized-suites lane into five shards. Both PRs touch `.github/workflows/pr.yml` in different matrix blocks; whichever merges second needs a trivial rebase. **What existing behavior does this improve?** The `general-server` vitest lane runs in four shards with a duration manifest sampled on 2026-08-01. **Current behavior** In PR run 30930345729, shard 3/4 ran for 311 seconds (273 seconds in the test step) and was the longest check in the run. The suite now totals about 946 seconds of serial vitest time. **Proposed behavior** Run the same suite set in five shards, balanced with a per-suite duration manifest refreshed from that run's shard logs (279 suites measured by diffing consecutive completion timestamps). **Reason and benefit** The refreshed LPT partition balances at about 196 seconds of suite time per shard (about 240 seconds per job), level with the other PR lanes. No test coverage is lost. **Breaking changes** None. The change only alters the CI partition size and the duration manifest. ## What Changed - Bump the `general-server` shard matrix in `.github/workflows/pr.yml` from four to five shards. - Refresh `scripts/general-server-shard-durations.json` from the 2026-08-04 run's shard logs. - Update `SHARD_COUNT` in `scripts/__tests__/run-vitest-stable-shard.test.mjs` to five. ## Verification - `node --test scripts/__tests__/run-vitest-stable-shard.test.mjs` — 9/9 pass, including the complete non-overlapping partition proof and the duration-balance check. - `node --test scripts/__tests__/release-verify-workflow.test.mjs` — 2/2 pass. - `node --test scripts/__tests__/e2e-shard.test.mjs` — 7/7 pass. - A 5-way dry-run partition covers all suites exactly once with equal projected weights. ## Risks - Low risk. The change only alters CI partition size and duration weights; the suite set is unchanged. - One more runner is used per PR run for this lane. - Stale duration weights degrade gracefully: suites missing from the manifest get the median weight. ## Model Used - Claude (Anthropic), Claude Code CLI, model ID `claude-fable-5`, extended thinking with tool use enabled. ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used (with version and capability details) - [x] I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work - [x] I have searched GitHub for duplicate or related PRs and linked them above - [x] I have either (a) linked existing issues with `Fixes: #` / `Closes #` / `Refs #` OR (b) described the issue in-PR following the relevant issue template - [x] I have not referenced internal/instance-local Paperclip issues or links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip` URLs) - [x] My branch name describes the change (e.g. `docs/...`, `fix/...`) and contains no internal Paperclip ticket id or instance-derived details - [x] I have run tests locally and they pass - [x] I have added or updated tests where applicable - [x] I have updated relevant documentation to reflect my changes (workflow comments explain the new shard math) - [x] I have considered and documented any risks above - [ ] All Paperclip CI gates are green - [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups - [x] I will address all Greptile and reviewer comments before requesting merge Co-authored-by: Claude <claude@paperclip.ing> Co-authored-by: Paperclip <noreply@paperclip.ing>