## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work.
> - Pull request CI must give contributors fast and stable feedback.
> - The `general-server` Vitest lane runs many single-worker server
suites.
> - A recent completed PR run showed this lane as the slowest completed
check.
> - Three shards still left one runner with the largest share of work.
> - This pull request splits that lane into four duration-balanced
shards.
> - The benefit is a shorter critical path for the same server test
coverage.
## Linked Issues or Issue Description
No public GitHub issue exists for this CI maintenance change.
**Pre-submission checklist**
- I confirmed this improves existing behavior. It does not add a new
command, endpoint, or concept.
- I searched open public issues and pull requests for related CI
sharding work.
**What existing behavior does this improve?**
The pull request workflow's `general-server` Vitest lane.
**Subsystem affected**
Cross-cutting. This affects GitHub Actions CI and the Vitest shard
duration manifest.
**Current behavior**
The `general-server` lane uses three shards. The server suites now total
about 880 seconds of serial Vitest wall time. The slowest shard was
about 313 seconds in the measured run.
**Proposed behavior**
The `general-server` lane uses four shards. Each shard receives about
220 seconds of predicted suite weight from the refreshed duration
manifest.
**Reason and benefit**
The slowest PR check controls how soon a reviewer can trust the PR. Four
balanced shards reduce the slowest `general-server` shard while keeping
the same suite selection rules.
**Breaking changes**
None. This only changes CI partitioning and duration data for existing
test suites.
**Additional context**
Related public searches found no exact open issue or pull request for
this `general-server` sharding change.
## What Changed
- Split the `general-server` CI matrix from three shards to four shards.
- Refreshed `scripts/general-server-shard-durations.json` with wall-time
weights from a recent completed PR run.
## Verification
- `node --test scripts/__tests__/run-vitest-stable-shard.test.mjs`
- `git diff --check origin/master...HEAD`
- Dry-ran the four `general-server` shards locally during
implementation. The partition covers 300 unique suites with about 220.56
seconds of predicted weight per shard.
- Ran a local sensitive-data scan before push. It found only test
filenames that contain words such as `secret` or `token`, not credential
values.
## Risks
Low risk. The main risk is that the duration manifest becomes stale as
suite costs move. Missing suites fall back to the median weight, so the
lane still runs if the manifest is incomplete.
## Model Used
OpenAI Codex, GPT-5, with tool use and local command execution.
## 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
- [x] I have considered and documented any risks above
- [x] All Paperclip CI gates are green
- [x] 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: Paperclip <noreply@paperclip.ing>
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