Agent Harness
A specialized testing framework that securely wraps an AI agent, intercepts its tool calls, and rigorously evaluates its behavior in a sandbox environment.
Think of It Like This
Like an aviation flight simulator that tests how a pilot reacts to fake emergencies without risking a real multi-million dollar aircraft.
Evaluating an agent interactively is dangerous if it can run destructive commands, so harnesses execute the model against mock systems or isolated containers. They score the agent not just on the final output, but on the trajectory of intermediate tool calls it made to get there. This prevents agents that achieve the right answer through luck or hallucinated data from passing the benchmark.