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fix(delegate): accept JSON string batch tasks

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Recover delegate_task batch inputs when open-weight models emit tasks as a JSON-encoded array string, and return clear errors for malformed task lists.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
Bartok 2026-05-08 12:30:08 -04:00 • committed by kshitij
parent 4632be123d
commit 326ca754ad
2 changed files with 90 additions and 0 deletions
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57
tests/tools/test_delegate.py
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@ -167,6 +167,63 @@ class TestDelegateTask(unittest.TestCase):
self.assertEqual(result["results"][1]["summary"], "Result B")
self.assertIn("total_duration_seconds", result)
@patch("tools.delegate_tool._run_single_child")
def test_batch_mode_accepts_json_string_tasks(self, mock_run):
mock_run.side_effect = [
{
"task_index": 0,
"status": "completed",
"summary": "Result A",
"api_calls": 2,
"duration_seconds": 3.0,
},
{
"task_index": 1,
"status": "completed",
"summary": "Result B",
"api_calls": 4,
"duration_seconds": 6.0,
},
]
parent = _make_mock_parent()
tasks = json.dumps(
[
{"goal": "Research topic A"},
{"goal": "Research topic B"},
]
)
result = json.loads(delegate_task(tasks=tasks, parent_agent=parent))
self.assertIn("results", result)
self.assertEqual(len(result["results"]), 2)
self.assertEqual(result["results"][0]["summary"], "Result A")
self.assertEqual(result["results"][1]["summary"], "Result B")
@patch("tools.delegate_tool._run_single_child")
def test_batch_mode_rejects_non_object_tasks(self, mock_run):
parent = _make_mock_parent()
result = json.loads(
delegate_task(tasks=["not a task object"], parent_agent=parent)
)
self.assertIn("error", result)
self.assertIn("Task 0 must be an object", result["error"])
mock_run.assert_not_called()
@patch("tools.delegate_tool._run_single_child")
def test_batch_mode_rejects_malformed_json_string_tasks(self, mock_run):
parent = _make_mock_parent()
result = json.loads(
delegate_task(tasks='[{"goal": "bad}', parent_agent=parent)
)
self.assertIn("error", result)
self.assertIn("could not be parsed as JSON", result["error"])
mock_run.assert_not_called()
@patch("tools.delegate_tool._run_single_child")
def test_batch_capped_at_3(self, mock_run):
mock_run.return_value = {