fix(providers): prevent stale models during refresh

Provider settings sheets can remain mounted while hidden, so the old display cache could survive into a different provider. Scope the cache to the active provider identity and remount the sheet when that identity changes.

packages/app/src/components/provider-diagnostic-models.test.ts

@@ -0,0 +1,69 @@
+import { describe, expect, it } from "vitest";
+import type { AgentModelDefinition } from "@getpaseo/protocol/agent-types";
+import {
+  resolveProviderDiscoveredModels,
+  type ProviderDiscoveredModelsCache,
+} from "./provider-diagnostic-models";
+
+const piModel: AgentModelDefinition = {
+  provider: "pi",
+  id: "pi/model",
+  label: "Pi Model",
+};
+
+const grokModel: AgentModelDefinition = {
+  provider: "grok",
+  id: "grok-build",
+  label: "Grok Build",
+};
+
+function resolveModels(input: {
+  serverId?: string;
+  provider: string;
+  currentModels?: AgentModelDefinition[];
+  loading?: boolean;
+  cache?: ProviderDiscoveredModelsCache | null;
+}) {
+  return resolveProviderDiscoveredModels({
+    serverId: input.serverId ?? "local",
+    provider: input.provider,
+    currentModels: input.currentModels,
+    providerSnapshotRefreshing: input.loading === true,
+    previousCache: input.cache ?? null,
+  });
+}
+
+describe("resolveProviderDiscoveredModels", () => {
+  it("keeps a provider's cached discovered models visible while that provider refreshes", () => {
+    const ready = resolveModels({ provider: "grok", currentModels: [grokModel] });
+
+    const refreshing = resolveModels({ provider: "grok", loading: true, cache: ready.cache });
+
+    expect(refreshing.models).toEqual([grokModel]);
+  });
+
+  it("does not show one provider's cached models while another provider loads", () => {
+    const ready = resolveModels({ provider: "pi", currentModels: [piModel] });
+
+    const refreshing = resolveModels({ provider: "grok", loading: true, cache: ready.cache });
+
+    expect(refreshing.models).toEqual([]);
+  });
+
+  it("does not show another server's cached models while the same provider loads", () => {
+    const ready = resolveModels({
+      serverId: "server-a",
+      provider: "grok",
+      currentModels: [grokModel],
+    });
+
+    const refreshing = resolveModels({
+      serverId: "server-b",
+      provider: "grok",
+      loading: true,
+      cache: ready.cache,
+    });
+
+    expect(refreshing.models).toEqual([]);
+  });
+});

packages/app/src/components/provider-diagnostic-models.ts

@@ -0,0 +1,43 @@
+import type { AgentModelDefinition } from "@getpaseo/protocol/agent-types";
+
+export interface ProviderDiscoveredModelsCache {
+  serverId: string;
+  provider: string;
+  models: AgentModelDefinition[];
+}
+
+export interface ResolveProviderDiscoveredModelsInput {
+  serverId: string;
+  provider: string;
+  currentModels: AgentModelDefinition[] | undefined;
+  providerSnapshotRefreshing: boolean;
+  previousCache: ProviderDiscoveredModelsCache | null;
+}
+
+export interface ResolveProviderDiscoveredModelsResult {
+  models: AgentModelDefinition[];
+  cache: ProviderDiscoveredModelsCache | null;
+}
+
+export function resolveProviderDiscoveredModels({
+  serverId,
+  provider,
+  currentModels,
+  providerSnapshotRefreshing,
+  previousCache,
+}: ResolveProviderDiscoveredModelsInput): ResolveProviderDiscoveredModelsResult {
+  if (currentModels && currentModels.length > 0) {
+    const cache = { serverId, provider, models: currentModels };
+    return { models: currentModels, cache };
+  }
+
+  if (
+    providerSnapshotRefreshing &&
+    previousCache?.serverId === serverId &&
+    previousCache.provider === provider
+  ) {
+    return { models: previousCache.models, cache: previousCache };
+  }
+
+  return { models: [], cache: previousCache };
+}

packages/app/src/components/provider-diagnostic-sheet.tsx

@@ -32,6 +32,10 @@ import { formatTimeAgo } from "@/utils/time";
 import { compareMatchScores, scoreTextFields } from "@/utils/score-match";
 import type { AgentModelDefinition, AgentProvider } from "@getpaseo/protocol/agent-types";
 import type { ProviderProfileModel } from "@getpaseo/protocol/provider-config";
+import {
+  resolveProviderDiscoveredModels,
+  type ProviderDiscoveredModelsCache,
+} from "./provider-diagnostic-models";
 
 interface ProviderDiagnosticSheetProps {
   provider: string;
@@ -599,21 +603,16 @@ export function ProviderDiagnosticSheet({
       : null;
   const modelsRefreshing = isRefreshing || providerSnapshotRefreshing;
 
-  const stableDiscoveredRef = useRef<AgentModelDefinition[]>([]);
+  const stableDiscoveredRef = useRef<ProviderDiscoveredModelsCache | null>(null);
   const currentModels = providerEntry?.models;
-  if (currentModels && currentModels.length > 0) {
-    stableDiscoveredRef.current = currentModels;
-  }
-
-  const discoveredModels = useMemo(() => {
-    if (currentModels && currentModels.length > 0) {
-      return currentModels;
-    }
-    if (providerSnapshotRefreshing) {
-      return stableDiscoveredRef.current;
-    }
-    return [];
-  }, [currentModels, providerSnapshotRefreshing]);
+  const { models: discoveredModels, cache: nextDiscoveredCache } = resolveProviderDiscoveredModels({
+    serverId,
+    provider,
+    currentModels,
+    providerSnapshotRefreshing,
+    previousCache: stableDiscoveredRef.current,
+  });
+  stableDiscoveredRef.current = nextDiscoveredCache;
 
   const [clockTick, setClockTick] = useState(0);
   useEffect(() => {

packages/app/src/components/provider-settings-host.tsx

@@ -18,6 +18,7 @@ export function ProviderSettingsHost() {
 
   return (
     <ProviderDiagnosticSheet
+      key={`${serverId}:${provider}`}
       provider={provider}
       serverId={serverId}
       visible={visible}