# NousResearch/hermes-agent · Gateway rejects mismatched session model/provider pairs

## Open now

- Nothing open on GitHub.

These items address a gateway issue where session.create accepts model and provider combinations that are incompatible, causing sessions to fail on the first message. The work involves adding validation to reject incoherent model×provider pairs at session creation time.

## 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 #116344. Verify it addresses your case.
- **Recommended:** read PR #116344 (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-116344`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #96817: fix(gateway): session.create accepts incoherent model×provider pairs, birthing sessions that 400 on message 1

## Prior & competing PRs

- **#116344: session.create refuses a model its provider cannot serve instead of a dead first turn (#96817, salvage #96845)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `hermes_cli/models_validate.py`, `tests/tui_gateway/test_session_create_model_provider_guard.py`, `tui_gateway/methods_session.py`, `tui_gateway/methods_session_model_guard.py`, `website/docs/developer-guide/programmatic-integration.md`
- **#96845: fix(gateway): reject incoherent session model providers**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `abc21bb427`, `#116344`

## Fix status

- Merged to main in PR #116344 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-19`.