diff --git a/crates/fakecloud-server/src/main.rs b/crates/fakecloud-server/src/main.rs
index c68f62ee..3ff4cb22 100644
--- a/crates/fakecloud-server/src/main.rs
+++ b/crates/fakecloud-server/src/main.rs
@@ -1773,9 +1773,7 @@ async fn main() {
                                     let stuck: Vec<String> = state
                                         .instances
                                         .iter()
-                                        .filter(|(_, inst)| {
-                                            inst.db_instance_status == "creating"
-                                        })
+                                        .filter(|(_, inst)| inst.db_instance_status == "creating")
                                         .map(|(id, _)| id.clone())
                                         .collect();
                                     for id in &stuck {
diff --git a/sdks/java/src/test/java/dev/fakecloud/E2ETest.java b/sdks/java/src/test/java/dev/fakecloud/E2ETest.java
index 565e3b39..d11134ab 100644
--- a/sdks/java/src/test/java/dev/fakecloud/E2ETest.java
+++ b/sdks/java/src/test/java/dev/fakecloud/E2ETest.java
@@ -329,7 +329,7 @@ void eventbridgeGetHistoryReturnsPutEvents() {
 
     // ── RDS ────────────────────────────────────────────────────────
     @Test
-    void rdsGetInstancesReturnsManagedInstances() {
+    void rdsGetInstancesReturnsManagedInstances() throws Exception {
         RdsClient rds = configure(RdsClient.builder()).build();
         rds.createDBInstance(CreateDbInstanceRequest.builder()
                 .dbInstanceIdentifier("java-rds-db")
@@ -342,6 +342,19 @@ void rdsGetInstancesReturnsManagedInstances() {
                 .dbName("appdb")
                 .build());
 
+        // CreateDBInstance returns a `creating` placeholder; poll until
+        // the container is up so the introspection endpoint reports the
+        // populated host_port / container_id.
+        long deadline = System.currentTimeMillis() + 240_000;
+        while (System.currentTimeMillis() < deadline) {
+            var desc = rds.describeDBInstances(b -> b.dbInstanceIdentifier("java-rds-db"));
+            if (!desc.dbInstances().isEmpty()
+                    && "available".equals(desc.dbInstances().get(0).dbInstanceStatusAsString())) {
+                break;
+            }
+            Thread.sleep(1000);
+        }
+
         var instance = fc.rds().getInstances().instances().stream()
                 .filter(i -> "java-rds-db".equals(i.dbInstanceIdentifier()))
                 .findFirst()
diff --git a/sdks/python/tests/test_client.py b/sdks/python/tests/test_client.py
index b21b322b..585743e7 100644
--- a/sdks/python/tests/test_client.py
+++ b/sdks/python/tests/test_client.py
@@ -111,6 +111,8 @@ def test_health(fc: FakeCloudSync, fakecloud_url: str) -> None:
 
 
 def test_rds_instances(fc: FakeCloudSync, fakecloud_url: str) -> None:
+    import time
+
     rds = boto3.client("rds", **_boto_kwargs(fakecloud_url))
     rds.create_db_instance(
         DBInstanceIdentifier="py-sdk-rds-db",
@@ -123,6 +125,19 @@ def test_rds_instances(fc: FakeCloudSync, fakecloud_url: str) -> None:
         DBName="appdb",
     )
 
+    # CreateDBInstance returns a `creating` placeholder; poll until the
+    # container is up so the introspection endpoint reports the populated
+    # container_id and host_port.
+    deadline = time.time() + 240
+    while time.time() < deadline:
+        desc = rds.describe_db_instances(DBInstanceIdentifier="py-sdk-rds-db")
+        if (
+            desc["DBInstances"]
+            and desc["DBInstances"][0]["DBInstanceStatus"] == "available"
+        ):
+            break
+        time.sleep(1)
+
     result = fc.rds.get_instances()
     instance = next(
         item