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## Thinking Path > - Paperclip moves agent work through sandboxed execution and control-plane services. > - The sandbox start path now has a no-op span seam. > - This change turns that seam on when OTLP export is configured. > - It keeps the default path unchanged when export is off. > - The result is structured startup traces with low-cardinality attributes and explicit parent links. > - The benefit is better observability without changing normal behavior. ## Linked Issues or Issue Description No public GitHub issue exists for this change. ### Problem The sandbox start path has a tracer seam, but it stays a no-op unless the OTLP export path is active. ### Proposed solution Enable the server tracer on sandbox bring-up, open a root span, parent each startup boundary to that root, and keep the export path opt-in behind `OTEL_EXPORTER_OTLP_ENDPOINT`. ### Alternatives considered - Keep the start path as a no-op. I rejected that path because it leaves sandbox start opaque when OTLP export is already configured. - Add broad attributes for commands and paths. I rejected that path because the span allowlist must stay low-cardinality. ### Roadmap alignment This follows the current OTel sandbox-start work and keeps the default path unchanged. ## What Changed - Add a root sandbox startup span and child spans for each named startup boundary. - Keep concurrent bridge spans parented to the root span. - Inject the server tracer through the adapter deps without OpenTelemetry imports in the engine. - Attach host-received provider duration attributes only when the values are finite. - Keep span attributes inside the allowlist and keep command, path, id, and error text out of span data. ## Verification - The pushed branch already passed `pnpm --filter @paperclipai/adapter-utils exec tsc --noEmit`. - The pushed branch already passed `pnpm exec vitest run packages/adapter-utils/src/acpx-engine/`. - The pushed branch already passed `pnpm --filter @paperclipai/server exec vitest run src/__tests__/environment-execution-target.test.ts src/__tests__/instrumentation.test.ts`. - The pushed branch already passed `pnpm --filter @paperclipai/server exec tsc --noEmit`. ## Risks - OTel export changes trace volume when the endpoint is set. - The allowlist limits trace detail, so new fields need care. - The change stays no-op when OTLP export is off. ## Model Used - OpenAI GPT-5, tool use enabled. ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used with 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 - [x] I have not referenced internal/instance-local Paperclip issues or links - [x] My branch name describes the change and contains no internal 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>