diff --git a/agent.py b/agent.py
index ff9e198..23ba458 100644
--- a/agent.py
+++ b/agent.py
@@ -60,6 +60,12 @@ class ContractClockStudioV1Config(BaseModel):
     pass
 
 
+class ContractClockState(BaseModel):
+    """Durable-state marker; records live in managed Postgres tables."""
+
+    durable_store: str = "managed_postgres"
+
+
 class Deadline(BaseModel):
     kind: Literal["renewal", "notice", "obligation"]
     date: str
@@ -143,6 +149,7 @@ class ContractClockStudioV1(A2AAgent[ContractClockStudioV1Config, PlatformUserAu
     )
     resources = Resources(cpu="500m", memory="512Mi", max_runtime_seconds=120)
     state = State.DURABLE
+    state_model = ContractClockState
     tools_used = ("postgres", "mcp")
     workspace_access = WorkspaceAccess.dynamic(
         max_files=4,