langgraph/how-tos/node-retries/

[giscus[bot]]

langgraph/how-tos/node-retries/

Build language agents as graphs

https://langchain-ai.github.io/langgraph/how-tos/node-retries/

[michaelozery]

Thank you!
fyi there is a typo in the 3rd line: policty

[vbarda]

thanks for reporting -- fixed!

[niklasmartin]

Can I add the error message to the messages in the state? For example, if I get Pydantic Validation Error, it would be nice to add the message to the state, so the llm knows what to do better.

[djprawns]

What if i have a JSONDecodeError? That inherits ValueError, and would be excluded. How could I retry on such an error?

[vbarda]

you can set retry_on, see more here https://langchain-ai.github.io/langgraph/reference/types/#langgraph.types.RetryPolicy.retry_on

[djprawns]

@vbarda , but JSONDecodeError is a subclass of ValueError. That would be excluded.

[vbarda]

that's only true for the default retry_on, but if you override it you can explicitly control what's being retried.

[reach-will]

Is using time travel/forking off graph states with errors with retry policies overkill? I believe that would lead to a lot of retries, increasing load and maybe leading to more issues instead, so I would like to know what would be the recommended approach overall, given I still see rewind/time travel mentioned in the documentation quite a bit (specifically when talking about human-in-the-loop).