## Thinking Path
> - Paperclip uses pull requests to ship control-plane changes with
review and audit.
> - This change extends sandbox provider telemetry.
> - The first PR added startup and exec spans.
> - This PR adds provider spans for cache hits, plugin tracer flow, and
Daytona file sync steps.
> - The host must keep the trust boundary and reject unsafe span data.
> - The result is fuller OTel coverage with bounded labels and safe
parentage.
## Linked Issues or Issue Description
**Problem or motivation**
Sandbox provider telemetry lacks an explicit cache-hit signal, plugin
span context, and file-sync pack and transfer spans.
The current proxy for a cache hit is fragile.
The plugin SDK also needs a safe tracer surface and a per-call parent
context.
**Proposed solution**
Add an explicit `cacheHit` flag from the Daytona sandbox handle lookup.
Expose `ctx.tracer` on the plugin context and pass a `traceparent`
string with each call.
Record provider spans on the host with allowlist clamping and capability
checks.
Wrap Daytona file sync pack and transfer steps in spans.
**Alternatives considered**
Keep the old `providerGetMs == 0` proxy.
Reject that path because the cache-hit decision belongs at the handle
lookup, not in a timing proxy.
The host stays the trust boundary for worker span data.
It clamps labels, rejects bad parent data, and gates the worker-to-host
span RPC by capability.
A security review completed before this PR opened.
## What Changed
- Added an explicit `cacheHit` flag from the Daytona sandbox handle
lookup.
- Added `ctx.tracer` on the plugin context and a `traceparent` field in
the per-call context.
- Added host-side span recording with attribute clamping and capability
checks.
- Wrapped Daytona file sync pack and transfer steps in spans.
- Added tests for the host trust boundary, the plugin tracer no-op path,
and the Daytona span paths.
## Verification
- `pnpm --filter @paperclipai/plugin-daytona exec vitest run`
- `pnpm --filter @paperclipai/plugin-sdk exec vitest run`
- `pnpm --filter @paperclipai/server exec vitest run
plugin-host-services environment-execution-target instrumentation
plugin-worker-manager`
- `tsc --noEmit` for server, plugin-sdk, and adapter-utils
## Risks
- Span data now crosses the worker boundary, so the host allowlist and
capability gate must stay strict.
- The `traceparent` path must stay valid and host-owned.
- Daytona file sync spans must not add new round trips.
## Model Used
OpenAI Codex, GPT-5, tool use.
## 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 with `Fixes:` / `Closes:` /
`Refs:` or described the issue in the PR body
- [x] I have not referenced internal or instance-local Paperclip issues
or links
- [x] My branch name describes the change 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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