## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work
> - Sandbox provider plugins run agent work in remote execution
environments
> - The Daytona sandbox liveness read can stay pending when the
connection stops responding
> - A pending read blocks the plugin until a broad host-to-worker limit
expires
> - This pull request adds bounded deadlines to Daytona liveness calls
and clears stale handles
> - The benefit is a fast and clear error when a Daytona connection
stops responding
## Linked Issues or Issue Description
Refs #11341
**What happened?**
The Daytona sandbox liveness read had no per-call timeout. A silent
connection failure left the read pending until the broad host-to-worker
RPC limit expired.
**Expected behavior**
The plugin should stop a liveness call within a defined limit and report
a clear timeout error.
**Steps to reproduce**
1. Create a Daytona sandbox handle.
2. Make the cached handle freshness read never resolve.
3. Run the next sandbox operation.
4. Observe that the operation waits for the outer RPC limit without a
liveness timeout.
**Paperclip version or commit**
`master` before this change.
**Deployment mode**
Any deployment mode that uses the Daytona sandbox provider.
## What Changed
- Add `withLivenessTimeout` with timer cleanup and
`SandboxLivenessTimeoutError`.
- Bound `refreshData` with configurable `livenessTimeoutMs`, which
defaults to 30000 milliseconds.
- Bound sandbox start and recovery calls with the SDK timeout plus a
5000 millisecond margin.
- Reject `livenessTimeoutMs` values above 86400000 milliseconds and
document the setting.
- Evict a cached handle after a failed freshness refresh so the next
operation fetches a new handle.
- Add a test for a never-resolving freshness refresh and the
cached-handle eviction.
## Verification
- Run the Daytona plugin test suite with its package Vitest
configuration.
- Confirm that 150 of 150 tests pass.
- Confirm that the new test reports a bounded timeout and a fresh handle
on the next operation.
- Confirm that GitHub Actions reports green status checks after the pull
request starts.
## Risks
This change adds an early timeout only to Daytona liveness calls. A
value of 0 or less disables the extra bound. The default leaves normal
SDK calls within their expected time limit. The main risk is a timeout
value that is too short for a slow but healthy connection.
## Model Used
OpenAI Codex, GPT-5. The model used tool calls and code execution. The
model supplied the PR handoff and did not author the code in this pull
request.
## 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
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Co-authored-by: Paperclip <noreply@paperclip.ing>
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