LangChain
Capture traces from LangChain apps with a callback handler, no code rewrite.
Add the Fenwick callback handler to your chains and agents. Every call, tool step and retrieval shows up as a span.
Any trace can become a test case in one click.
Category
Frameworks
Setup time
5 minutes
Plans
Every plan, Hobby included
More integrations
Run your next prompt change against 200 real cases this afternoon.
Free for 500 runs a month. Team from $39 a seat.