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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - The heartbeat system records agent runs and can add a run summary to an issue. > - The ACPX engine receives output text and internal thought text as separate streams. > - The default summary strategy joined both streams and could publish internal text in an issue comment. > - Paperclip already has final-output segmentation for run summaries. > - This pull request makes final-output-only summaries mandatory and removes the configuration bypass. > - The benefit is that automatic issue comments contain the intended final message instead of internal execution text. ## Linked Issues or Issue Description Refs #11761 **What happened?** The ACPX engine used the full summary strategy when an adapter did not set `summaryStrategy`. That strategy joined all text deltas, including thought-stream text and intermediate narration. The heartbeat finalizer could then store that summary as an issue comment. **Expected behavior** An automatic issue comment must use only the final output segment. Configuration must not allow thought-stream text or intermediate narration into that summary. **Steps to reproduce** 1. Run an ACPX adapter without a configured `summaryStrategy`. 2. Emit an output delta, a thought delta, a tool call, and a final output delta. 3. Read the generated run summary. 4. Observe that the old default included all text deltas. **Paperclip version or commit** `54b8bec44417511c623999613f9f1006f8af0517` **Deployment mode** Built from source with a local ACPX adapter. ## What Changed - Limit ACPX run summaries to the final non-empty output segment. - Ignore the legacy full-summary setting so configuration cannot bypass containment. - Update regression tests for the safe default and an attempted unsafe override. ## Verification - Observed the new guard fail before the implementation change because the summary contained thought text. - Ran `pnpm exec vitest run packages/adapter-utils/src/acpx-engine/execute.test.ts -t "defaults run summaries to the final output segment without thought text|does not allow configuration to include thought text in run summaries"`. Result: 2 passed. - Ran `pnpm exec vitest run packages/adapter-utils/src/acpx-engine/execute.test.ts`. Result: 130 passed. - Ran `pnpm --filter @paperclipai/adapter-utils typecheck`. Result: passed. ## Risks - Run summaries are shorter for adapters that relied on full text aggregation. - The old `summaryStrategy: "full"` setting no longer changes summary behavior. This is an intentional containment change. - The change does not alter run logs or tool events. It changes only the summary selected for downstream use. > This is a focused security and privacy bug fix. It does not add roadmap scope. ## Model Used - OpenAI Codex on the GPT-5 family. The runtime did not expose the exact model ID or context-window size. Reasoning, tool use, terminal execution, and code editing were 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 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 task id - [x] I have run tests locally and they pass - [x] I have added or updated tests where applicable - [x] I have updated relevant inline 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