diff --git a/extensions/ollama/provider-policy-api.js b/extensions/ollama/provider-policy-api.js
new file mode 100644
index 00000000000..ceb3dbe62cd
--- /dev/null
+++ b/extensions/ollama/provider-policy-api.js
@@ -0,0 +1,40 @@
+import { OLLAMA_DEFAULT_BASE_URL } from "./src/defaults.js";
+
+/**
+ * Provider policy surface for Ollama: normalize provider configs used by
+ * core defaults/normalizers. This runs during config defaults application and
+ * normalization paths (not Zod validation). It ensures the Ollama provider
+ * config uses the native Ollama default base URL when baseUrl is omitted.
+ *
+ * Keep this intentionally small: do not change types or try to sidestep core
+ * schema validation. This helper makes runtime normalization and defaults
+ * consistent for Ollama-only paths.
+ */
+export function normalizeConfig({ provider, providerConfig }) {
+  if (!providerConfig || typeof providerConfig !== "object") {
+    return providerConfig;
+  }
+
+  // Only normalize the Ollama provider; be tolerant of provider aliasing/case.
+  const normalizedProviderId = String(provider ?? "")
+    .trim()
+    .toLowerCase();
+  if (normalizedProviderId !== "ollama") {
+    return providerConfig;
+  }
+
+  const next = { ...providerConfig };
+  // If baseUrl is missing/empty, default to local Ollama host. Do not override
+  // a deliberately-set empty string or non-string value beyond normalization.
+  if (typeof next.baseUrl !== "string" || !next.baseUrl.trim()) {
+    next.baseUrl = OLLAMA_DEFAULT_BASE_URL;
+  }
+
+  // If models is missing/not an array, default to empty array to signal
+  // that discovery should run to populate models.
+  if (!Array.isArray(next.models)) {
+    next.models = [];
+  }
+
+  return next;
+}