The Model dropdown's onChange writes to config.runtime_config.model
whenever a runtime is set (hermes, claude-code, etc.), and only
falls back to top-level config.model when no runtime is selected.
But handleSave used to diff the new value against top-level
nextSource.model only — so for any runtime-bearing workspace, the
PUT /workspaces/:id/model never fired and MODEL_PROVIDER never
landed in workspace_secrets.
Symptom (2026-04-30, hongmingwang Hermes Agent
32993ee7-840e-4c02-8ca8-cb9d75d112a5):
- User picks minimax/MiniMax-M2.7-highspeed from the dropdown
- Hits Save & Restart
- Save reports success; restart fires
- The new EC2 boots with HERMES_DEFAULT_MODEL empty
- install.sh defaults to nousresearch/hermes-4-70b
- hermes-agent errors "No LLM provider configured" on every chat
turn because no NOUS_API_KEY / OPENROUTER_API_KEY is set
- Reload Config tab → model field reverts to whatever
GET /workspaces/:id/model returns (i.e. empty / template default)
handleSave now reads the effective model from runtime_config.model
first and falls back to top-level model for legacy no-runtime
workspaces. Same change for the old-value diff so a no-op Save
still skips the PUT.
Tests pin both branches: PUTs /model when the dropdown changed
runtime_config.model on a hermes workspace; does NOT PUT when
the value is unchanged from what GET /model returned.
7706db5a93