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PaperClipAI/packages/plugins
Nicky LeachandPaperclip b2edea5754 fix(workspaces): verify existing worktrees before fresh retries (#20876)
## Thinking Path

> - Paperclip manages work for AI agents.
> - Retry checks whether the task can keep its existing workspace.
> - A provider can complete checkout before Core receives the result.
> - Recreating a completed worktree costs time and can change its base
commit.
> - Core uses the same ownership and writer checks for local and
provider workspaces.
> - The provider verifies its checkout before Core creates a fresh
workspace.

## Linked Issues or Issue Description

**What happened?**

A retry can allocate a new provider worktree even though the original
checkout completed.

**Steps to reproduce**

Complete workspace checkout through a storage provider. Fail Runner
startup or lose the prepare reply. Retry the task.

**Expected behavior**

Reuse the same worktree when the provider confirms checkout and the
prior run can no longer write to it.

Related: #20865 addresses timeouts while the original prepare is in
progress. This PR checks an earlier checkout when the user retries.

## What Changed

- Check the prior task binding and writer state before asking a storage
provider to verify a checkout.
- Extend the existing prepare operation with an optional verification
mode. Providers opt in through their manifest.
- Return through normal workspace reuse after verification. Keep the
fresh retry fallback when verification cannot establish checkout.

## Verification

- Core workspace preparation, plugin workspace ownership, retry
continuity, and SDK workspace-provider suites passed locally (213
tests).
- Focused cases pass for provider verification, retry through heartbeat
dispatch, and real local Git checkout verification with no plugin
worker. The heartbeat test confirms that ordinary preparation and
adapter dispatch keep the original workspace, branch, and base commit.
- Core server typecheck passed before the final audit and timing edits.
GitHub CI covers the final revision and broader regressions.

## Risks

Provider verification adds one bounded call before a fresh retry. Older
providers keep their current behavior. Verification must preserve the
workspace, branch, and recorded base commit. The normal execution
preparation checks still run before admission. No database migration is
needed.

## Model Used

OpenAI GPT-6 (Codex), with source inspection and local test 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 linked existing issues or described the issue in-PR
following the relevant issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links
- [x] My branch name describes the change and contains no internal issue
details
- [x] I have run targeted 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

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Co-authored-by: Paperclip <noreply@paperclip.ing>
2026-11-11 18:04:18 +00:00
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