It is invoked before the agent calls the large language model (LLM). This callback implements two core features: 1. **Guardrail**：Checks if the user input contains any sensitive words from the ...

It is invoked after the agent executes a tool but before its output is sent back to the model. Mainly used for post-processing the tool's output, such as PII ...

Learn coding in Python, Go and Rust from Serdar Yegulalp, software dev specialist and senior writer at InfoWorld. Python 3.15 has introduced a feature to allow "lazy" module imports, where an imported ...