Your AI Agent Says “Done!” — Here’s How to Know If It’s Lying

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A tested, dependency-light tracing and evaluation library that catches the failure mode plain logging can’t — an agent that fails a tool call and confidently reports success anyway.

Estimated Reading Time: 17–20 minutes

Table of Contents #

• Introduction
• Problem Statement
• Background
• Core Concepts
• Technology Deep Dive
• Architecture
• Mini Project: TraceBench
• Implementation
• Code Walkthrough
• Testing
• Performance
• Limitations
• Best Practices
• Common Mistakes
• Production Considerations
• Future Improvements
• Conclusion
• Further Reading
• Official References

Introduction #

Picture a pilot’s black box. It doesn’t fly the plane. It doesn’t make the plane safer by itself. What it does is record, second by second, exactly what every system was doing — so that when something goes wrong, nobody has…