Model Call Limit Middleware (Python)

Published: 20 November 2025
on channel: LangChain
3,504
93

Learn about how to use LangChain's model call limit middleware as a guardrail for agents. This middleware can be used for single agent invocations or across conversations. We walk through an example of keeping a billing subagent focused by limiting the number of turns the model can take before returning to the supervisor customer service agent.

Middleware docs: https://docs.langchain.com/oss/python...

Code: https://gist.github.com/sydney-runkle...


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