diff --git a/packages/server/src/server/daemon-config-store.test.ts b/packages/server/src/server/daemon-config-store.test.ts
index cf5677e744..1bb6680259 100644
--- a/packages/server/src/server/daemon-config-store.test.ts
+++ b/packages/server/src/server/daemon-config-store.test.ts
@@ -468,6 +468,21 @@ describe("DaemonConfigStore", () => {
       expect(store.get().agentProfiles).toEqual([{ id, name: id, provider: id, options: {} }]);
     });
 
+    test("a provider edit in the same write does not hide which adapter a profile runs on", async () => {
+      const store = storeWithLegacyProfiles();
+
+      await store.patch({
+        providers: { "my-codex": { label: "Renamed" } },
+        agentProfiles: [
+          { id: "p", name: "P", provider: "my-codex", featureValues: { fast_mode: false } },
+        ],
+      });
+
+      expect(store.get().agentProfiles).toEqual([
+        { id: "p", name: "P", provider: "my-codex", options: { service_tier: "default" } },
+      ]);
+    });
+
     test("a malformed value rejects the write and leaves config reads working", async () => {
       const store = storeWithLegacyProfiles();
 
diff --git a/packages/server/src/server/daemon-config-store.ts b/packages/server/src/server/daemon-config-store.ts
index 55b7cd0caa..c762999458 100644
--- a/packages/server/src/server/daemon-config-store.ts
+++ b/packages/server/src/server/daemon-config-store.ts
@@ -465,6 +465,18 @@ export class DaemonConfigStore {
     return this.enqueue(() => this.applySupportedPatch({ skills: { selection } }));
   }
 
+  private foldPatchProfiles<
+    T extends { agentProfiles?: AgentProfile[]; providers?: Record<string, ProviderOverride> },
+  >(submittedPatch: T): T {
+    return foldConfigProfiles({
+      config: submittedPatch,
+      // The provider graph this request will commit, so `extends` survives a partial edit.
+      providers: deepMerge(this.current.providers ?? {}, submittedPatch.providers ?? {}),
+      source: "client write",
+      held: this.current.agentProfiles,
+    });
+  }
+
   private async applySupportedPatch(
     parsedPatch: SupportedMutableConfigPatch,
   ): Promise<MutableDaemonConfig> {
@@ -474,12 +486,7 @@ export class DaemonConfigStore {
       );
     }
     const { removeProviders = [], ...submittedPatch } = parsedPatch;
-    const patch = foldConfigProfiles({
-      config: submittedPatch,
-      providers: { ...this.current.providers, ...submittedPatch.providers },
-      source: "client write",
-      held: this.current.agentProfiles,
-    });
+    const patch = this.foldPatchProfiles(submittedPatch);
     const { features: speechPatch, ...configPatch } = patch;
     const removedProviders = Array.from(new Set(removeProviders));
     const merged = deepMerge(this.current, configPatch);