# NousResearch/hermes-agent · Desktop stale stream delta duplication fixes

## Open now

- Nothing open on GitHub.

A cluster of issues and fixes addressing stale or superseded streaming deltas on desktop that could cause previous message text to appear duplicated or dropped at turn boundaries. The work involves guarding against out-of-order stream events across turn transitions.

## TL;DR

- 5 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 3 PR(s) closed without merging.
- A fix was merged to main in PR #120601. Verify it addresses your case.
- **Recommended:** read PR #120601 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `resolved` · deciding PR(s): `pr-120601`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.50`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #119543: Desktop: stale background-review stream can visibly duplicate previous message text before new turn starts

## Prior & competing PRs

- **#120601: fix: background-review supersede no longer duplicates or drops desktop replies; fork turns tagged in logs**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `agent/background_review.py`, `agent/turn_context.py`, `agent/turn_finalizer.py`, `apps/desktop/src/app/session/hooks/use-message-stream/background-review-interrupt.test.tsx`, `apps/desktop/src/app/session/hooks/use-message-stream/gateway-event/index.ts`, `apps/desktop/src/app/session/hooks/use-message-stream/gateway-event/message-stream.test.ts`, `apps/desktop/src/app/session/hooks/use-message-stream/gateway-event/message-stream.ts`, `apps/desktop/src/app/session/hooks/use-message-stream/gateway-event/session-info.ts`, `apps/desktop/src/app/session/hooks/use-message-stream/gateway-event/types.ts`, `apps/desktop/src/app/session/hooks/use-message-stream/heartbeat-complete-reorder.test.tsx`, `apps/desktop/src/app/session/hooks/use-message-stream/index.ts`, `apps/desktop/src/app/session/hooks/use-prompt-actions/steering-recovery.test.tsx`, `apps/desktop/src/app/types.ts`, `tests/agent/test_background_review.py`
- **#119556: fix(desktop): fence stale pre-start stream deltas**. closed without merge
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `#120601`, `#119543`
- **#119571: fix(desktop): drop superseded-turn delta orphans at message.start**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`
- **#119673: fix(desktop): guard against stale message.complete across turn boundary**. closed without merge
  - maintainer direction: category `silent_close`; implication `active`

## Fix status

- Merged to main in PR #120601 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-23`.
- Subsystem: `apps/desktop`