## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work.
> - The project workspace policy editor sets how agent runs share a
project's execution workspace.
> - The server now has a `sharedWorkspaceConcurrency` policy (Refs
#10759), but the UI had no control for it.
> - Users could not choose the concurrency mode without editing the API
directly.
> - This pull request adds a 3-option select (Auto / Serialize / Allow)
to the policy editor.
> - The benefit is that users set shared-workspace concurrency in the
UI, with clear helper text for each mode.
## Linked Issues or Issue Description
Refs #10759 (server contract this UI drives).
**Feature request**
- **Is your feature request related to a problem? Please describe.**
The `sharedWorkspaceConcurrency` policy field shipped on the server, but
the project workspace policy editor had no control to set it. Users
could not pick a concurrency mode from the UI.
- **Describe the solution you would like.**
Add a 3-option select (Auto / Serialize / Allow) to the
execution-workspace policy editor, with helper text that explains each
mode. An unset value must show as Auto.
- **Describe alternatives you have considered.**
A set of radio buttons was considered. A select matches the compact
style of the other controls in the same editor (environment, base ref).
## What Changed
- Added a "Shared workspace concurrency" select to the project
execution-workspace policy editor
(`ui/src/components/ProjectProperties.tsx`).
- The select offers three options with helper text:
- **Auto** (default): "Concurrent runs on local/SSH runners; runs take
turns in cloud sandboxes."
- **Serialize**: "Runs always take turns in the shared project
workspace."
- **Allow**: "Runs never wait for the workspace; concurrent edits are
possible."
- An unset or absent value shows as **Auto**. The UI writes a value only
after the user picks one, so the policy round-trips as Auto until then.
- Added a `SharedWorkspaceConcurrency` type import and a new
`execution_workspace_shared_concurrency` save-state key.
- Added a stateful Storybook story so the controlled select can be
exercised.
### Screenshots
**Before** (light / dark) — the editor had no concurrency control:
**After** (light / dark) — the select shows Auto by default:
**Helper text updates per option** (Serialize / Allow):
## Verification
- `pnpm --filter @paperclipai/ui typecheck` passes.
- `pnpm --filter @paperclipai/shared build` passes.
- Rendered the editor in Storybook (light and dark). The select shows
Auto when the policy is unset. Selecting Serialize or Allow updates the
helper text and the stored value.
## Risks
- Low risk. UI-only change. The control is additive and only appears
when isolated task checkouts are enabled. An unset value keeps the
current Auto behavior, so existing projects are unaffected.
## Model Used
- Claude Opus 4.8 (claude-opus-4-8), extended thinking, tool use / code
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
- [ ] I have updated relevant documentation to reflect my changes
- [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 Opus 4.8 <noreply@anthropic.com>
Co-authored-by: Paperclip <noreply@paperclip.ing>
Dotta
