# NousResearch/hermes-agent · Model switch corrupts session state causing retry loops

## Open now

- Nothing open on GitHub.

A bug where switching models corrupts turn/session state, particularly with Hindsight enabled, leading to retry loops and IndexError. Related fixes address resetting recovery state and clearing stale turn state on model switch.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 0 merged PR(s), 2 PR(s) closed without merging.
- No fix has been merged to main; one or more PRs were attempted (see below).
- **Recommended:** review the prior/competing PR(s) below. A fix was attempted but not merged; your case may extend or revive that work.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `unresolved`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #25325: \[Bug\]: Model switching corrupts session/request state with Hindsight enabled, causing retry loop and IndexError

## Prior & competing PRs

- **#25343: fix: reset model-switch recovery state and include follow-up cleanup**. closed without merge
  - maintainer direction: category `silent_close`; implication `active`
- **#26121: fix(agent): clear stale turn state on model switch**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `#25325`, `#25343`

## Fix status

- No merged fix on record.
- Subsystem: `agent`