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## Thinking Path > - Paperclip runs AI-agent work through adapter-backed execution paths. > - Sandbox-backed local adapters pay startup overhead in two host-side bridge setups. > - Those setups were happening serially even though most of the work is independent. > - The remaining dependency is only the merged env that must reach the process-session launch. > - This pull request overlaps the independent setup work while preserving that launch-time dependency. > - The benefit is lower end-to-end startup latency without changing execution semantics. ## Linked Issues or Issue Description No public GitHub issue exists for this change. Problem / motivation: - Sandbox-backed local adapter startup waited for two largely independent bridge setups in series, so users paid roughly the sum of both setup times. - The only hard dependency is the merged Paperclip env that must reach the process-session launch. Proposed solution: - Start the paperclip callback bridge and the process-session bridge concurrently. - Keep the env merge as the single sequencing point before process-session launch. - Stop whichever bridge started if either startup path fails. - Keep the concurrent bridge telemetry duration-only so shared runner counters are not double-counted. Alternatives considered: - Keep the bridges serial, which preserves the current telemetry shape but leaves the startup latency unchanged. - Move env merging earlier, which would complicate launch ordering and risk changing runtime semantics. Roadmap alignment: - This is the approved Daytona start-speedup work, focused on bridge startup concurrency rather than broader runtime behavior. ## What Changed - Started the paperclip callback bridge and the process-session bridge concurrently in `execute.ts`. - Added a memoized env finalizer so the process-session launch still waits for the merged paperclip env at the correct moment. - Updated `execution-target.ts` so the process-session bridge can accept a deferred env resolver and consume it only at launch time. - Added tests that cover the overlapped launch path and the failure-cleanup path when one bridge start fails. ## Verification - `pnpm --filter @paperclipai/adapter-utils exec vitest run src/acpx-engine/execute.test.ts` - `pnpm --filter @paperclipai/adapter-utils test` - `pnpm --filter @paperclipai/adapter-utils exec tsc --noEmit` - `git log --oneline origin/master..origin/perf/parallelize-daytona-bridge-setups` - `git diff --stat origin/master...origin/perf/parallelize-daytona-bridge-setups` ## Risks - A regression in the launch-time env merge could change what the process-session bridge sees at startup. - The concurrent start/cleanup logic could leak a bridge if the stop paths were incorrect, which is why the failure cleanup test matters. - This is low-to-moderate risk because the change is isolated to adapter-utils startup plumbing and is covered by targeted tests. ## Model Used OpenAI Codex, GPT-5, tool-using code execution mode. ## 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 - [ ] 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>