Tool Call Limit Middleware Python - Latest Information & Updates 2026

Web Reference: Jan 2, 2014 · This middleware monitors the number of tool calls made and can terminate or restrict execution when limits are exceeded. It supports both thread-level (persistent across runs) and run-level (per invocation) call counting. Extends `AgentState` with tool call tracking fields. The count fields are dictionaries mapping tool names to execution counts. This allows multiple middleware instances to track different tools independently. The special key `'__all__'` is used for tracking all tool calls globally. Type Parameters: ResponseT: The type of the structured response. Learn about how to use LangChain's tool call limit middleware to control an agent's tool calling abilities across single interactions and full conversations....

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Last Updated: April 4, 2026

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