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Nicky LeachandClaude Opus 5.5
0173110ee3
## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - When a later run cannot attach to a native session, the run fails, and a later run may start a new provider thread. > - The first failure is easy to miss. In 5 of 11 cases on a test deployment, the run ended with a different error before it reported the attach failure. > - People and agents who diagnose a failed run look at its log and events, so that is where an explanation is useful. > - This pull request adds a pointer there at the first failure, with the real cause and a link to the docs. > - The benefit is that a failed attach explains itself, and readers can find the open follow-up in #19047. ## Linked Issues or Issue Description Refs #19047. I searched open and closed pull requests and issues for `prior_attach_failed` and related terms, and found no duplicate. ## What Changed - **Log:** `executeHeartbeatRuntime` writes one stderr line to the run log when a same-run retry follows a failed `run.attach`. - **Events:** `heartbeat.ts` adds a `lifecycle` event with the same message and the code `native_run_attach_failed`, using the stored redacted failure. - **Helper:** `describeFailedAttachment` extracts the real cause and returns nothing for other failures. - **Docs:** "Session settlement after a run" in `doc/execution-semantics.md` now explains this and links #19047. - **Link target:** the pointer links to the repo docs and not the issue. Agents read these logs, and anyone can comment on a public issue. - **Unchanged:** error codes and retry behavior. ## Verification - `cd server && pnpm exec vitest run src/services/heartbeat/runtime-execution.test.ts src/services/native-runtime/remote-warm-session-recovery.test.ts`: 57 passed. - `npx tsc --noEmit -p .` in `server` reports no errors. - New tests cover the log line at the throw site, and the helper's output for attach failures and other failures. - **Not covered:** the new event in `heartbeat.ts` has no test of its own. It uses the tested helper. - **Not verified:** I have not confirmed that agents read this log when they diagnose a failure. - **Not run locally:** the full test suite. CI provides that coverage. ## Risks - **Failure text in the log:** when the failure has no structured message, the log line includes the whole failure string. It passes through the run log's identity redaction. The event uses the stored failure that the executor already redacted. - **Link stability:** the link depends on the docs heading. Renaming that heading would break the anchor but not the page link. - **Migrations:** this change has no migration. > 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 reworked. ## Model Used - Anthropic Claude Opus 5.5 (`claude-opus-5-5`), through Claude Code, with tool use and code execution. A human directed the design and approved the scope. ## 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 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>