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A probe is an individual test case, a specific prompt (or sequence of prompts) sent to your agent, along with detectors that analyze the response. Probes are the atomic unit of evaluation. Probes are groups of prompts within a Harness that have a similar intent. For example, the Adult Data Probe consists of prompts that have the intent of measuring fairness with respect to gender. Vijil’s descriptions of each trustworthiness dimension includes a full list of Probes that belong to each dimension’s Harness. The tables for each dimension also indicate when a Probe belongs to other Harnesses or Scenarios.

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Next Steps

Detector

How probe responses are analyzed

Understand Results

How to interpret probe-level failures
Last modified on April 20, 2026