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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - Sandbox-backed runs need more precise startup observability so operators can see where time is spent before an adapter is invoked > - Aggregate startup timing hides which boundary is actually slow, especially in remote execution where the bottleneck can move between host round-trips, provider-boundary latency, and handshake phases > - This pull request keeps the existing startup timing channel additive while attributing the latency to the specific startup steps that caused it > - The benefit is better diagnosis of sandbox startup regressions without changing control flow or introducing a schema migration ## Linked Issues or Issue Description Refs: #10204 This PR extends the existing sandbox run-startup timing observability with per-step round-trip and provider-latency attribution for the Daytona startup path. It keeps the event payload additive and free-form, and it leaves the control flow, database schema, and external adapter interfaces unchanged. ## What Changed - Added per-step round-trip counting for the host-to-sandbox execute seam - Added provider-boundary duration accumulation for the Daytona execute and re-fetch steps - Split the ACP handshake timing into `createRuntimeMs` and `ensureSessionMs` while preserving the warm-handle skip - Kept the startup timing payload additive and did not add a schema migration ## Verification - `adapter-utils` acpx-engine and startup-timing suites: pass - Daytona plugin suite: pass with mocked SDK and injected-clock duration assertions - `server` environment-execution-target suite: pass - `tsc --noEmit` for adapter-utils and server: pass - Git validation: fetched `origin/feat/sandbox-start-step-timing-attribution`, confirmed it matches the authorized submit SHA `53c573266e618af05c57a0720aaa9d9e0452de61`, and confirmed the branch contains only the expected commit on top of `origin/master` - Searched GitHub for duplicate or related PRs/issues; found one closely related merged PR and no open duplicate on this branch - Checked `ROADMAP.md`; the broad sandbox-agent roadmap section does not call out this specific startup-timing attribution work as a duplicate ## Risks - Low risk: the change is additive and only enriches existing timing data - Downstream consumers that assume aggregate-only startup timing may need to tolerate the additional per-step fields - The finer spawn/initialize/session split remains a follow-up in the external ACP client because that hook is not available here yet ## Model Used OpenAI GPT-5, tool-using coding agent ## 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 - [ ] All Paperclip CI gates are green - [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups - [ ] I will address all Greptile and reviewer comments before requesting merge --------- Co-authored-by: Harold Kim <harold@paperclip.ing> Co-authored-by: Paperclip <noreply@paperclip.ing>