# NousResearch/hermes-agent · Desktop live-session model/reasoning changes and stale_generation errors

## Open now

- Nothing open on GitHub.

These members appear to concern the desktop app's handling of live-session model or reasoning-option changes, with one bug report describing repeated \`stale_generation\` failures from a retained \`session.mutate\` carrying an outdated \`expected_generation\`. The other two are fix-oriented items touching related behavior (next-turn application of a model pick, and retiring stale generation mutations); the titles alone don't establish their outcome.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 1 PR(s) closed without merging.
- A fix was merged to main in PR #139604. Verify it addresses your case.
- **Recommended:** read PR #139604 (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-139604`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 `0.67`: 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

- #138952: \[Bug\]: Desktop: changing reasoning effort repeatedly fails with \`stale_generation\` ("模型选项更新失败") — retained \`session.mutate\` keeps a stale \`expected_generation\`

## Prior & competing PRs

- **#139604: fix(gateway,desktop): a live-session model pick applies to the next turn or says why not**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `apps/desktop/src/api/canonical-live-pick.test.ts`, `apps/desktop/src/api/canonical-protocol.ts`, `apps/desktop/src/api/canonical-retained-mutation-stale.test.ts`, `apps/desktop/src/api/client.ts`, `apps/desktop/src/app/session/hooks/use-message-stream/gateway-event/deferred-pick.test.ts`, `apps/desktop/src/app/session/hooks/use-message-stream/gateway-event/deferred-pick.ts`, `apps/desktop/src/app/session/hooks/use-message-stream/gateway-event/index.ts`, `apps/desktop/src/app/session/hooks/use-model-controls.test.tsx`, `apps/desktop/src/app/session/hooks/use-model-controls.ts`, `apps/desktop/src/i18n/ar_chrome.ts`, `apps/desktop/src/i18n/de_model_menu.ts`, `apps/desktop/src/i18n/en_model_menu.ts`, `apps/desktop/src/i18n/es_model_menu.ts`, `apps/desktop/src/i18n/fr_model_menu.ts`, `apps/desktop/src/i18n/ja_model_menu.ts`, `apps/desktop/src/i18n/ru_model_menu.ts`, `apps/desktop/src/i18n/types_model_menu.ts`, `apps/desktop/src/i18n/zh-hant_chrome.ts`, `apps/desktop/src/i18n/zh_model_menu.ts`, `gateway/session_authority.py` (+31 more)
- **#138959: fix(desktop): retire stale generation mutations**. closed without merge
  - maintainer direction: category `uncategorized`; implication `needs_llm`; refs `#139604`

## Fix status

- Merged to main in PR #139604 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-10-16`.
- Subsystem: `apps/desktop`