# NousResearch/hermes-agent · Provider not persisted when switching models in sessions

## Open now

- Nothing open on GitHub.

These issues and PRs concern a bug where the provider field is not saved to model_config during a model switch, causing sessions that use cross-provider fallback to fail on resume. Fixes target both the persistence function and session resume logic.

## TL;DR

- 5 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 2 merged PR(s), 2 PR(s) closed without merging.
- A fix was merged to main in PR #85261. Verify it addresses your case.
- **Recommended:** read PR #85261 (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-85261`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 `0.40`: 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

- #79536: bug(persistence): update_session_model() doesn't persist provider in model_config → cross-provider fallback sessions 404 on resume

## Prior & competing PRs

- **#85261: fix: restore session model on resume instead of falling back to config default**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `cli.py`, `hermes_cli/cli_agent_setup_mixin.py`, `hermes_cli/cli_commands_mixin.py`, `hermes_state.py`, `tests/cli/test_resume_model_restore.py`
- **#85977: fix: persist provider on model switch and add billing_provider fallback**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `gateway/slash_commands.py`, `hermes_state.py`, `tests/cli/test_resume_model_restore.py`, `tui_gateway/server.py`
- **#79604: fix(session): persist provider on model switch and use it on resume**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#85977`, `#85721`
- **#79811: fix(persistence): persist provider in model_config on model switch (#79536)**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `#79604`, `#79604`

## Fix status

- Merged to main in PR #85261 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-08-14`.