diff --git a/src/sentry/seer/agent/client_models.py b/src/sentry/seer/agent/client_models.py
index eb46d25cdb53..ff3d0998f254 100644
--- a/src/sentry/seer/agent/client_models.py
+++ b/src/sentry/seer/agent/client_models.py
@@ -264,6 +264,7 @@ class SeerRunState(BaseModel):
     blocks: list[MemoryBlock]
     status: Literal["processing", "completed", "error", "awaiting_user_input"]
     updated_at: str
+    failure_reason: str | None = None
     owner_user_id: int | None = None
     pending_user_input: PendingUserInput | None = None
     repo_pr_states: dict[str, RepoPRState] = Field(default_factory=dict)
diff --git a/tests/sentry/seer/endpoints/test_organization_seer_agent_chat.py b/tests/sentry/seer/endpoints/test_organization_seer_agent_chat.py
index 303ab4bb3988..8c06cb71b3eb 100644
--- a/tests/sentry/seer/endpoints/test_organization_seer_agent_chat.py
+++ b/tests/sentry/seer/endpoints/test_organization_seer_agent_chat.py
@@ -58,6 +58,23 @@ def test_get_with_run_id_calls_client(self, mock_client_class: MagicMock) -> Non
         assert response.data["sentry_run_id"] is None
         mock_client.get_run.assert_called_once_with(run_id=123)
 
+    @patch("sentry.seer.endpoints.organization_seer_agent_chat.SeerAgentClient")
+    def test_get_includes_failure_reason(self, mock_client_class: MagicMock) -> None:
+        mock_client = MagicMock()
+        mock_client.get_run.return_value = SeerRunState(
+            run_id=123,
+            blocks=[],
+            status="error",
+            updated_at="2024-01-01T00:00:00Z",
+            failure_reason="provider_unavailable",
+        )
+        mock_client_class.return_value = mock_client
+
+        response = self.client.get(f"{self.url}123/")
+
+        assert response.status_code == 200
+        assert response.data["session"]["failure_reason"] == "provider_unavailable"
+
     @patch("sentry.seer.endpoints.organization_seer_agent_chat.SeerAgentClient")
     def test_get_excludes_private_fields(self, mock_client_class: MagicMock) -> None:
         mock_state = SeerRunState(