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## Thinking Path > - Paperclip coordinates AI agent work and records execution data. > - The sandbox startup path and the host-to-sandbox execution path need clearer OpenTelemetry spans. > - The trace data now shows wait time, critical path data, and bounded labels. > - This pull request adds bounded spans and closed attribute helpers for sandbox startup and execution. > - The result is better trace data with low cardinality and no secret leakage. ## Linked Issues or Issue Description - No public GitHub issue exists for this branch. - Related PR: #10536 - This PR extends the sandbox OpenTelemetry work with exec spans, root timing, and bounded labels. ## What Changed - Added a closed span-attribute contract for sandbox startup data. - Added a bounded label helper for command and region values. - Threaded the active step context into the execution path. - Added a `sandbox.exec` span with true timestamps and bounded attributes. - Added skipped-step and root-span timing data with low-cardinality context. - Moved handshake sub-times and bridge batch data onto spans. ## Verification - `pnpm --filter @paperclipai/adapter-utils run typecheck` - `pnpm --filter @paperclipai/server run typecheck` - `pnpm --filter @paperclipai/adapter-utils exec vitest run` - `pnpm --filter @paperclipai/server exec vitest run environment-execution-target` - `git log --oneline origin/master..origin/feat/sandbox-startup-otel-spans` - `git diff origin/master...origin/feat/sandbox-startup-otel-spans --stat` ## Risks - Span attribute rules could still miss a future field if new code skips the shared helper. - Low-cardinality labels may hide some detail, but that is the intended tradeoff. - Tracing stays fail-open, so a missing tracer still hides data rather than stopping work. ## Model Used - OpenAI Codex, GPT-5, tool use enabled. The runtime did not expose the context window size. ## 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 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] Greptile is 5/5 with no open P2s, recommendations, or follow-ups - [x] I will address all Greptile and reviewer comments before requesting merge The current head still has one failing required check: `e2e`. The PR stays unready for board handoff until that check passes. --------- Co-authored-by: Paperclip <noreply@paperclip.ing>