fix(desktop): persist the whole discovered model list when saving an endpoint

Test enumerates a custom provider's catalogue and the panel holds the result
in discoveredModels, but the save payload never carried it, so only the one
model the user hand-typed reached providers.<id>.models. Every downstream
picker reads that map straight from config.yaml with no live probe, which is
why a proxy serving 18 models offered exactly one.

Send the discovered list and merge it onto the entry, so models already
known keep their context lengths.

Fixes #69988

Co-authored-by: asorry75 <33794789+asorry75@users.noreply.github.com>

apps/desktop/src/app/settings/custom-endpoints-settings.tsx

@@ -58,7 +58,7 @@ function formFromEndpoint(endpoint: CustomEndpoint): EndpointForm {
   }
 }
 
-function toPayload(form: EndpointForm): CustomEndpointUpdate {
+function toPayload(form: EndpointForm, models?: string[]): CustomEndpointUpdate {
   const contextLength = Number.parseInt(form.contextLength, 10)
 
   return {
@@ -69,7 +69,8 @@ function toPayload(form: EndpointForm): CustomEndpointUpdate {
     api_key: form.apiKey.trim() || undefined,
     context_length: Number.isFinite(contextLength) && contextLength > 0 ? contextLength : undefined,
     discover_models: form.discoverModels,
-    make_default: form.makeDefault
+    make_default: form.makeDefault,
+    models: models?.length ? models : undefined
   }
 }
 
@@ -125,7 +126,7 @@ export function CustomEndpointsSettings({ onConfigSaved, onMainModelChanged }: C
   async function handleSave() {
     try {
       setSaving(true)
-      const response = await saveCustomEndpoint(toPayload(form))
+      const response = await saveCustomEndpoint(toPayload(form, discoveredModels))
       setEndpoints(response.endpoints)
       const saved = response.endpoints.find(endpoint => endpoint.id === response.id)
 

apps/desktop/src/types/hermes.ts

@@ -182,6 +182,7 @@ export interface CustomEndpointUpdate {
   id?: string
   make_default?: boolean
   model: string
+  models?: string[]
   name: string
 }
 

hermes_cli/web_server.py

@@ -1271,6 +1271,7 @@ class CustomEndpointUpdate(BaseModel):
     context_length: Optional[int] = None
     discover_models: bool = True
     make_default: bool = False
+    models: Optional[List[str]] = None
 
 
 class MessagingPlatformUpdate(BaseModel):
@@ -7700,13 +7701,20 @@ def _write_custom_endpoint(cfg: Dict[str, Any], body: CustomEndpointUpdate) -> T
         "model": model,
         "discover_models": bool(body.discover_models),
     })
-    # Same for the model map: the panel names one default model, it does not
-    # enumerate the provider's catalogue. Keep the other models (and their
-    # context lengths) and just ensure this one is present.
+    # Same for the model map: merge rather than replace, so existing models
+    # keep their context lengths. ``body.models`` is the catalogue the panel's
+    # Test button already discovered — without it only the one hand-typed
+    # model survived Save, and every picker showed a single-entry list for a
+    # provider serving dozens (#69988). A payload with no ``models`` (older
+    # UI) still just ensures the named default is present.
     existing_models = entry.get("models")
     models_map: Dict[str, Any] = dict(existing_models) if isinstance(existing_models, dict) else {}
-    current_model_entry = models_map.get(model)
-    models_map[model] = dict(current_model_entry) if isinstance(current_model_entry, dict) else {}
+    for candidate in (*(body.models or ()), model):
+        model_id = str(candidate).strip()
+        if not model_id:
+            continue
+        current = models_map.get(model_id)
+        models_map[model_id] = dict(current) if isinstance(current, dict) else {}
     entry["models"] = models_map
     if body.context_length and body.context_length > 0:
         entry["context_length"] = int(body.context_length)