[Solved] What will happen if a custom agent's plan method returns None instead of a valid action? — Ans: The agent will raise an error or stop execution. | LangChain

LangChain - Agents

What will happen if a custom agent's plan method returns None instead of a valid action?

AThe agent will raise an error or stop execution.

BThe agent will automatically retry the plan method.

CThe agent will proceed with a default action silently.

DThe agent will ignore the None and wait for input.

Step-by-Step Solution

Solution:

Step 1: Understand expected plan method output
The plan method must return a valid action or decision for the agent to continue.
Step 2: Consequence of returning None
Returning None breaks the expected flow, causing errors or halting execution.
Final Answer:
The agent will raise an error or stop execution. -> Option A
Quick Check:
plan must return action, None causes error [OK]

Quick Trick: plan must return valid action, not None [OK]

Common Mistakes:

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What will happen if a custom agent's plan method returns None instead of a valid action?