fix: don't warn about expired OAuth tokens with valid refresh tokens (#4593)

OAuth credentials with a refresh token auto-renew on first API call,
so the doctor should not warn about access token expiration when a
refresh token is present. This avoids unnecessary "expired" warnings
that prompt users to re-auth when no action is needed.

Fixes #3032

Co-authored-by: Ayush Ojha <ayushozha@outlook.com>

src/agents/auth-health.test.ts

@@ -52,11 +52,39 @@ describe("buildAuthHealthSummary", () => {
     );
 
     expect(statuses["anthropic:ok"]).toBe("ok");
-    expect(statuses["anthropic:expiring"]).toBe("expiring");
-    expect(statuses["anthropic:expired"]).toBe("expired");
+    // OAuth credentials with refresh tokens are auto-renewable, so they report "ok"
+    expect(statuses["anthropic:expiring"]).toBe("ok");
+    expect(statuses["anthropic:expired"]).toBe("ok");
     expect(statuses["anthropic:api"]).toBe("static");
 
     const provider = summary.providers.find((entry) => entry.provider === "anthropic");
-    expect(provider?.status).toBe("expired");
+    expect(provider?.status).toBe("ok");
+  });
+
+  it("reports expired for OAuth without a refresh token", () => {
+    vi.spyOn(Date, "now").mockReturnValue(now);
+    const store = {
+      version: 1,
+      profiles: {
+        "google:no-refresh": {
+          type: "oauth" as const,
+          provider: "google-antigravity",
+          access: "access",
+          refresh: "",
+          expires: now - 10_000,
+        },
+      },
+    };
+
+    const summary = buildAuthHealthSummary({
+      store,
+      warnAfterMs: DEFAULT_OAUTH_WARN_MS,
+    });
+
+    const statuses = Object.fromEntries(
+      summary.profiles.map((profile) => [profile.profileId, profile.status]),
+    );
+
+    expect(statuses["google:no-refresh"]).toBe("expired");
   });
 });

src/agents/auth-health.ts

@@ -123,7 +123,16 @@ function buildProfileHealth(params: {
     };
   }
 
-  const { status, remainingMs } = resolveOAuthStatus(credential.expires, now, warnAfterMs);
+  const hasRefreshToken = typeof credential.refresh === "string" && credential.refresh.length > 0;
+  const { status: rawStatus, remainingMs } = resolveOAuthStatus(
+    credential.expires,
+    now,
+    warnAfterMs,
+  );
+  // OAuth credentials with a valid refresh token auto-renew on first API call,
+  // so don't warn about access token expiration.
+  const status =
+    hasRefreshToken && (rawStatus === "expired" || rawStatus === "expiring") ? "ok" : rawStatus;
   return {
     profileId,
     provider: credential.provider,