diff --git a/.changes/unreleased/Fixes-20240508-132133.yaml b/.changes/unreleased/Fixes-20240508-132133.yaml
new file mode 100644
index 00000000000..b0c5935def3
--- /dev/null
+++ b/.changes/unreleased/Fixes-20240508-132133.yaml
@@ -0,0 +1,7 @@
+kind: Fixes
+body: Undo conditional agate import to prevent UnresolvedTypeReferenceError during
+  RunResult serialization
+time: 2024-05-08T13:21:33.604231+02:00
+custom:
+  Author: jtcohen6
+  Issue: "10098"
diff --git a/core/dbt/artifacts/schemas/run/v5/run.py b/core/dbt/artifacts/schemas/run/v5/run.py
index d3e6bfa4ece..c886cce7dd1 100644
--- a/core/dbt/artifacts/schemas/run/v5/run.py
+++ b/core/dbt/artifacts/schemas/run/v5/run.py
@@ -1,9 +1,15 @@
 import threading
-from typing import Any, Optional, Iterable, Tuple, Sequence, Dict, TYPE_CHECKING
+from typing import Any, Optional, Iterable, Tuple, Sequence, Dict
 import copy
 from dataclasses import dataclass, field
 from datetime import datetime
 
+# https://github.com/dbt-labs/dbt-core/issues/10098
+# Needed for Mashumaro serialization of RunResult below
+# TODO: investigate alternative approaches to restore conditional import
+# if TYPE_CHECKING:
+import agate
+
 
 from dbt_common.constants import SECRET_ENV_PREFIX
 from dbt.artifacts.resources import CompiledResource
@@ -24,10 +30,6 @@
 from dbt.exceptions import scrub_secrets
 
 
-if TYPE_CHECKING:
-    import agate
-
-
 @dataclass
 class RunResult(NodeResult):
     agate_table: Optional["agate.Table"] = field(
diff --git a/tests/functional/artifacts/test_run_results.py b/tests/functional/artifacts/test_run_results.py
index 7f136afdb60..537db015198 100644
--- a/tests/functional/artifacts/test_run_results.py
+++ b/tests/functional/artifacts/test_run_results.py
@@ -40,6 +40,22 @@ def test_timing_exists(self, project):
         assert len(results.results[0].timing) > 0
 
 
+class TestRunResultsSerializableInContext:
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {"model.sql": good_model_sql}
+
+    @pytest.fixture(scope="class")
+    def project_config_update(self):
+        return {
+            "on-run-end": ["{% for result in results %}{{ log(result.to_dict()) }}{% endfor %}"]
+        }
+
+    def test_results_serializable(self, project):
+        results = run_dbt(["run"])
+        assert len(results.results) == 1
+
+
 # This test is failing due to the faulty assumptions that run_results.json would
 # be written multiple times. Temporarily disabling.
 @pytest.mark.skip()