docs/build/snippets/python/code-samples/rubric-code-generation-invoke-py.mdx

```python
from langchain.messages import HumanMessage

result = agent.invoke(
    {
        "messages": [
            HumanMessage(
                content=(
                    "Write a Python function `find_duplicates(lst)` that returns a list of "
                    "all elements that appear more than once in the input list, in the order "
                    "they first appear."
                )
            )
        ],
        "rubric": (
            "- All tests pass in run_test_suite\n"
            "- The function is named `find_duplicates` and accepts a single list argument\n"
        ),
    },
    config={"configurable": {"thread_id": "code-generation-session"}},
)
print(result["messages"][-1].text)
```