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Do AI Agents Really Use the Tools You Build for Them? I Tested It.
Artificial Intelligence   Data Science   Latest   Machine Learning

Do AI Agents Really Use the Tools You Build for Them? I Tested It.

Last Updated on September 25, 2025 by Editorial Team

Author(s): Marie Humbert-Droz, PhD

Originally published on Towards AI.

Testing tool coverage in local agents and how to improve compliance.

I thought my healthcare AI agent would call my lab-checking tool every time it encountered lab values. Instead? Only 1 out of 9 times. The rate was so low I thought there was a bug in my code.

Do AI Agents Really Use the Tools You Build for Them? I Tested It.

Image caption not provided.

The article discusses the results of testing a healthcare AI agent’s tool-calling capabilities, revealing that the agent performed poorly in calling necessary tools, especially in lab flagging. The author explains the importance of evaluating tool usage, detailing rigorous testing methods, and highlights the need for clear prompts to ensure that the agent reliably utilizes the available tools. Improvements on the tool-calling process are proposed, emphasizing the significance of ensuring the agent’s compliance in making accurate calls for optimal functionality.

Read the full blog for free on Medium.

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