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<!-- Write all pull request text in Simplified Technical English (ASD-STE100): short sentences, one instruction per sentence, simple approved vocabulary, and the active voice. --> ## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - Agents update tasks through the issue API. > - The update response did not state which values changed. > - Blocker updates also did not echo the scalar blocker IDs. > - Agents therefore used an extra GET request to confirm a successful write. > - This pull request adds an authoritative change receipt and an optional small response. > - The benefit is fewer API calls with a clear and compatible write contract. ## Linked Issues or Issue Description No public GitHub issue exists for this change. ### Subsystem affected Cross-cutting: `server/`, `packages/shared`, and the UI issue cache. ### Problem or motivation A successful issue PATCH returned the updated issue, but it did not identify the effective changes. Blocker writes returned relation summaries without the scalar IDs. Agents could not distinguish a confirmed clear operation from missing data. The response must confirm committed field and blocker changes while existing UI clients continue to receive the full issue by default. ### Proposed solution Add a `changes` receipt. Add a conditional `blockedByIssueIds` echo. Support `Prefer: return=minimal`. Keep the full response as the default. ### Alternatives considered Make the small response the default for agent tokens. This would create different response contracts by actor type, so this pull request does not use that design. ### Roadmap alignment This is a focused control-plane reliability improvement. It does not duplicate an open roadmap milestone. ## What Changed - Compute committed issue row and relation changes in the issue service. - Omit no-op fields and truncate changed long text values to 200 characters. - Echo blocker ID arrays for blocker set and clear requests. - Add the opt-in `Prefer: return=minimal` response and `Preference-Applied` header. - Keep receipt metadata out of React Query issue caches. - Add route and embedded Postgres tests for the new contract. ## Verification - `pnpm exec vitest run server/src/__tests__/issue-activity-events-routes.test.ts` - `pnpm exec vitest run server/src/__tests__/issues-service.test.ts -t "returns authoritative update receipts for row fields and blocker relations"` - `pnpm --filter @paperclipai/shared typecheck` - `pnpm --filter @paperclipai/server typecheck` - `pnpm --filter @paperclipai/ui typecheck` - `pnpm check:token-gates` - `git diff --check` ## Risks - Low compatibility risk. The default response only adds receipt fields. - Minimal mode is opt-in. Existing clients do not receive a smaller body. - The receipt excludes `updatedAt` because the response already returns it as the freshness anchor. - Prose API and agent workflow guidance will follow after the server contract is available. > For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and discuss it in `#dev` before opening the PR. Feature PRs that overlap with planned core work may need to be redirected — check the roadmap first. See `CONTRIBUTING.md`. ## Model Used - OpenAI Codex based on GPT-5. The exact deployment ID, context window size, and reasoning mode are not exposed to the agent. The agent used repository tools, code execution, and test execution. ## 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>