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## Summary
When a task runs in a branch-pinned execution workspace, agents
sometimes switch or rename the workspace branch, which breaks the
worktree contract. This adds a short, one-time prompt hint telling the
agent to stay on the pinned branch.
- **heartbeat.ts**: after the execution workspace is resolved, attach
`executionWorkspace: { branchName }` to the wake payload (only when a
branch pin exists — agent-home runs without a branch are untouched).
- **server-utils.ts (adapter-utils)**: normalize the new payload field
and render one bullet in `renderPaperclipWakePrompt`:
> `- execution workspace branch: you are running in an execution
workspace on branch \`<name>\`. Do not switch, rename, or re-point this
branch; keep all commits on it.`
- The hint renders **only on non-resumed sessions** — resume-delta
prompts skip it, so it appears the first time an issue's session starts,
not on every turn, and it never pollutes the issue thread. One renderer
change covers every adapter (claude, codex, cursor, gemini, grok,
opencode, pi, hermes, acpx engine) with zero per-adapter edits.
## Tests
- `server-utils.test.ts`: branch guard renders on first prompt, absent
on resumed-session prompts, absent when no branch is pinned; payload
round-trips through `stringifyPaperclipWakePayload`.
- `heartbeat-workspace-branch-containment.test.ts`: the finalize-path
adapter mock now asserts the wake payload the adapter receives carries
the branch pin matching `context.paperclipWorkspace.branchName`
(end-to-end heartbeat wiring, embedded postgres). All 6 pass.
- Full `server-utils` (56) and acpx-engine execute (34) suites green;
adapter-utils typechecks clean; no new server tsc errors.
PAP-13326
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Paperclip <noreply@paperclip.ing>