diff --git a/scripts/probe_on_call.py b/scripts/probe_on_call.py
new file mode 100755
index 0000000..9872d23
--- /dev/null
+++ b/scripts/probe_on_call.py
@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+"""Probe on-call schedules via the MCP client.
+
+Verifies that the 'SDK-Verification' on-call schedule exists and is
+reachable via list_on_call_schedules / get_on_call_schedule.
+
+Usage:
+    export HYPERPING_API_KEY=sk_...    # or HYPERPING_TEST_API_KEY for test account
+    python scripts/probe_on_call.py
+
+Exit code 0 = all criteria met; exit code 1 = schedule missing or probe failed.
+
+If the schedule does not exist, create it through the Hyperping web UI:
+  - Name: SDK-Verification
+  - Rotations: 1
+  - Frequency: daily
+  - Keep the schedule permanently for future regression probes.
+"""
+
+import os
+import sys
+
+from hyperping import HyperpingMcpClient
+
+_SCHEDULE_NAME = "SDK-Verification"
+
+
+def main() -> int:
+    api_key = os.environ.get("HYPERPING_API_KEY") or os.environ.get("HYPERPING_TEST_API_KEY")
+    if not api_key:
+        print("ERROR: Set HYPERPING_API_KEY (or HYPERPING_TEST_API_KEY).")
+        return 1
+
+    with HyperpingMcpClient(api_key=api_key) as mcp:
+        print("Probing list_on_call_schedules ...")
+        schedules = mcp.list_on_call_schedules()
+
+        if not schedules:
+            print(
+                "FAIL: list_on_call_schedules returned an empty array.\n"
+                f"      Create '{_SCHEDULE_NAME}' through the Hyperping web UI and re-run."
+            )
+            return 1
+
+        target = next((s for s in schedules if s.name == _SCHEDULE_NAME), None)
+        if target is None:
+            names = ", ".join(s.name for s in schedules)
+            print(
+                f"FAIL: No schedule named '{_SCHEDULE_NAME}' found.\n"
+                f"      Existing schedules: {names}\n"
+                f"      Create '{_SCHEDULE_NAME}' through the Hyperping web UI and re-run."
+            )
+            return 1
+
+        print(f"OK:   Found schedule '{target.name}' (uuid={target.uuid})")
+
+        print(f"Probing get_on_call_schedule({target.uuid!r}) ...")
+        fetched = mcp.get_on_call_schedule(target.uuid)
+        if fetched.uuid != target.uuid:
+            print(f"FAIL: get_on_call_schedule returned mismatched UUID: {fetched.uuid}")
+            return 1
+
+        print(f"OK:   get_on_call_schedule confirmed uuid={fetched.uuid}")
+
+    print("\nAll acceptance criteria satisfied.")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())