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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - Product E2E tests use a local gateway to record model usage and reserve costs. > - Test cleanup can disconnect a background request before its provider sends final usage. > - Immediate abort then leaves the request cost unknown and its full reservation held. > - This pull request lets an admitted response finish within a short drain period. > - The benefit is better accounting without a new request or a retry. ## Linked Issues or Issue Description Refs #17365 and #17354. **What happened?** Two hosted cases passed, but cleanup canceled background requests before the gateway received their usage. Both requests kept their full holds. A local HTTP regression reproduces this loss with OpenAI and Anthropic responses. **Expected behavior** Retain final usage when an already-dispatched response finishes within a bounded cleanup period. Keep the client outcome canceled. Preserve the hold when final usage is still unknown. **Steps to reproduce** 1. Send a request through the eval gateway. 2. Disconnect the client before the provider returns final usage. 3. Close the gateway and let the provider response arrive. 4. Before this fix, the gateway aborts immediately and loses the final receipt. **Paperclip version or commit** Reproduced against master `b6e690044a821faab52d5466db36c4330c754a2d`. ## What Changed - Drain an already-dispatched response for at most five seconds after a disconnect. Keep the original provider timeout and campaign deadline. - Stop forwarding response data to a disconnected client. Stop admission as soon as shutdown begins. - Retain `clientDisconnected` on the private receipt and keep the outcome canceled, even when final usage arrives. - Make repeated shutdown calls share completion. - Add HTTP and SSE regression tests. Document the drain and its accounting limits. ## Verification - Red: five regression cases failed against the previous gateway implementation. Four further cases reproduced late cancellation during review. - `pnpm test:e2e:runner:unit`: 4,072 Vitest tests and 137 Node contract tests passed. Two existing Vitest tests were skipped. - `pnpm exec tsc --noEmit -p tests/runner-e2e/tsconfig.json`: passed. - `git diff --check`: passed. - Regressions cover both providers, an interrupted SSE stream, grace expiry, a shorter provider deadline, no dispatch during interrupted identity resolution, no new admission, repeated shutdown, client-only disconnects, and disconnects during each final receipt/ledger write. - Full repository typecheck, tests, and build passed in [CI run 40026846417](https://github.com/paperclipai/paperclip/actions/runs/40026846417) on `40ef13bd4d5df6b2ca0a9666fb485adf2a565c28`. Greptile and Paperclip reviews are both 5/5. No paid model test was run for this change. Live qualification remains open. ## Risks - Cleanup can take up to five more seconds. The admitted request can continue generating during that period, inside its existing reservation and deadlines. - An abort does not prove that the provider stopped billing. Missing usage keeps the unknown hold. - This change does not establish invoice settlement or rewrite historical receipts. It changes only the eval gateway. ## Model Used OpenAI Codex, GPT-6 family, with reasoning, code execution, and tool use. The host does not expose an exact model build identifier or context window size for this session. ## 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 - [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>