trust runtime materialization evidence

HARNESS_VERSION

@@ -1 +1 @@
-0.20.16
+0.20.17

src/clean_agent_preview.py

@@ -1514,7 +1514,9 @@ def required_artifacts_have_content(required_artifacts):
     return True
 
 
-def successful_required_artifact_mutation(tool_name, arguments, required_artifacts):
+def successful_required_artifact_mutation(
+    tool_name, arguments, required_artifacts, execution_result=None,
+):
     """Recognize completed outputs without letting an empty directory pass.
 
     Typed tools can authoritatively report a successful exact file write even
@@ -1523,6 +1525,13 @@ def successful_required_artifact_mutation(tool_name, arguments, required_artifac
     container, so they require observable non-empty file content.
     """
     targets = [str(path or '').strip().rstrip('/') for path in required_artifacts]
+    materialized = {
+        str(path or '').strip().rstrip('/')
+        for path in (execution_result or {}).get('materialized_artifacts', ())
+        if str(path or '').strip()
+    }
+    if targets and all(target in materialized for target in targets):
+        return True
     if required_artifacts_have_content(targets):
         return True
     if not targets or any(not Path(target).suffix for target in targets):
@@ -5864,7 +5873,7 @@ async def stream_preview(*, endpoint_url, model, messages, headers, turn_contrac
                             if canonical(block.tool_type) in {'edit_document', 'update_document'}:
                                 successful_editor_writer = canonical(block.tool_type)
                             if successful_required_artifact_mutation(
-                                block.tool_type, args, required_artifacts,
+                                block.tool_type, args, required_artifacts, result,
                             ):
                                 successful_artifact_write = True
                     except (ValueError, jsonschema.ValidationError) as exc:

tests/test_clean_agent_preview.py

@@ -504,6 +504,12 @@ def test_required_artifact_mutation_trusts_exact_files_but_not_empty_directory_s
     output_dir.mkdir()
     assert not module.successful_required_artifact_mutation(
         'bash', {'command': f'mkdir -p {output_dir}'}, (str(output_dir),),
+        {'workspace_mutated': True, 'mutated_artifacts': [str(output_dir)]},
+    )
+    assert module.successful_required_artifact_mutation(
+        'python', {'code': f"open('{output_dir}/1.tex', 'w').write('table')"},
+        (str(output_dir),),
+        {'materialized_artifacts': [str(output_dir)]},
     )
     output_file = tmp_path / 'output.html'
     assert module.successful_required_artifact_mutation(

tests/test_harness_version.py

@@ -8,7 +8,7 @@ ROOT = Path(__file__).resolve().parents[1]
 def test_original_harness_version_is_canonical_semver() -> None:
     version = (ROOT / "HARNESS_VERSION").read_text(encoding="utf-8").strip()
 
-    assert version == "0.20.16"
+    assert version == "0.20.17"
     assert re.fullmatch(r"\d+\.\d+\.\d+", version)