fix: Google invalid keys no longer stop model fallback (#114887)

* fix(agents): classify Google invalid API keys

Fixes #114784.\n\nCo-authored-by: 1052326311 <65798732+1052326311@users.noreply.github.com>

* fix(agents): bound invalid key matcher

src/agents/embedded-agent-helpers/failover-matches.test.ts

@@ -107,7 +107,7 @@ describe("Z.ai vendor error codes (#48988)", () => {
 });
 
 describe("Google invalid API key errors (#114784)", () => {
-  it("classifies the Google Generative AI invalid-key response as auth", () => {
+  it("classifies Google Generative AI's invalid-key response as auth", () => {
     const raw =
       "Google Generative AI API error (400): API key not valid. Please pass a valid API key. [code=INVALID_ARGUMENT]";
 
@@ -115,8 +115,14 @@ describe("Google invalid API key errors (#114784)", () => {
     expect(classifyFailoverReason(raw)).toBe("auth");
   });
 
-  it("classifies the structured API_KEY_INVALID variant as auth", () => {
-    expect(isAuthErrorMessage('{"code":"API_KEY_INVALID"}')).toBe(true);
+  it.each([
+    "invalid_api_key_error",
+    "API key is invalid",
+    '{"code":"API_KEY_INVALID"}',
+    '{"code":"API_KEY_INVALID_ERROR"}',
+  ])("classifies the %s variant as auth", (raw) => {
+    expect(isAuthErrorMessage(raw)).toBe(true);
+    expect(classifyFailoverReason(raw)).toBe("auth");
   });
 
   it("does not treat unrelated Google invalid arguments as auth", () => {
@@ -125,9 +131,10 @@ describe("Google invalid API key errors (#114784)", () => {
 
     expect(isAuthErrorMessage(raw)).toBe(false);
     expect(classifyFailoverReason(raw)).toBeNull();
+    expect(isAuthErrorMessage("API key invalidation policy updated")).toBe(false);
+    expect(isAuthErrorMessage("INVALID API KEYSTORE configuration")).toBe(false);
   });
 });
-
 describe("Chinese provider overload messages", () => {
   const ZHIPU_OVERLOAD = "[1305][该模型当前访问量过大，请您稍后再试]";
 

src/agents/embedded-agent-helpers/failover-matches.ts

@@ -17,10 +17,13 @@ const HIGH_CONFIDENCE_AUTH_PERMANENT_PATTERNS = [
   "not allowed for this organization",
 ] as const satisfies readonly ErrorPattern[];
 
+// Providers use both "invalid API key" and "API key is/not valid" word order.
+// Keep them in one matcher so every result/exception classifier agrees on auth failover.
+const INVALID_API_KEY_RE =
+  /(?:invalid[_ ]?api[_ ]?key(?![a-z0-9])|api[_ ]?key(?:[_ ]?(?:is[_ ]?)?(?:invalid(?![a-z0-9])|not[_ ]?valid(?![a-z0-9]))))/i;
+
 const AMBIGUOUS_AUTH_ERROR_PATTERNS = [
-  /invalid[_ ]?api[_ ]?key/,
-  // Google returns HTTP 400 with these variants for an invalid Generative AI key (#114784).
-  /api[_ ]?key(?:[_ ]?(?:is )?(?:invalid|not valid))\b/i,
+  INVALID_API_KEY_RE,
   /could not (?:authenticate|validate).*(?:api[_ ]?key|credentials)/i,
   "permission_error",
 ] as const satisfies readonly ErrorPattern[];

src/agents/embedded-agent-runner/result-fallback-classifier.test.ts

@@ -50,6 +50,27 @@ describe("classifyEmbeddedAgentRunResultForModelFallback", () => {
     });
   });
 
+  it("classifies Google invalid-key result payloads before fallback settlement", () => {
+    const rawError =
+      "Google Generative AI API error (400): API key not valid. Please pass a valid API key. [code=INVALID_ARGUMENT]";
+
+    const result = classifyEmbeddedAgentRunResultForModelFallback({
+      provider: "google",
+      model: "gemini-3.1-pro-preview",
+      result: {
+        payloads: [{ isError: true, text: rawError }],
+        meta: { durationMs: 42 },
+      },
+    });
+
+    expect(result).toEqual({
+      message: `google/gemini-3.1-pro-preview ended with a provider error: ${rawError}`,
+      reason: "auth",
+      code: "embedded_error_payload",
+      rawError,
+    });
+  });
+
   it("classifies structured provider upstream_error payloads as fallback-worthy", () => {
     const rawError =
       '{"error":{"message":"Upstream request failed","type":"upstream_error","param":"","code":null}}';