The 4-line function that fixed my agent's wrong answers (conditional edge in LangGraph)
My ReAct agent gave wrong answers for a week. It would call a tool, get a result, and immediately answer without checking if the result made sense.
The fix was a conditional edge — 4 lines:
def conditional_edge(state: MessageState):
last_message = state["messages"][-1]
if last_message.tool_calls:
return "tool"
return END
Without it: LLM → tool → answer (one shot, no self-correction)
With it: LLM → tool → check → loop back if needed → answer
Full repo (67 lines total): https://github.com/dunjeonmaster07/react-agent
What other simple patterns made a big difference in your agent's reliability?
u/Low_Edge7695 — 3 hours ago
