x-eval

Score and benchmark AI agent outputs using multi-rubric evaluation.

1|Updated Mar 27, 2026
One-click install
npx skills add https://github.com/x-mesh/x-kit --skill x-eval
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: x-eval
Source: https://github.com/x-mesh/x-kit/tree/main/x-eval/skills/eval
Command: npx skills add https://github.com/x-mesh/x-kit --skill x-eval

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires x-op, x-build, x-probe, x-humble, and includes scripts (resource) and references (resource) and assets (resource) components.

What problem does it solve?

This Skill provides a comprehensive solution for evaluating the quality of AI agent outputs, enabling users to score, compare, benchmark, and calibrate agent performance.

Core Features & Use Cases

  • Multi-Rubric Scoring: Score agent outputs against predefined or custom rubrics to ensure quality and consistency.
  • Benchmarking: Compare different strategies or models on the same task for performance analysis.
  • A/B Testing: Conduct A/B experiments with prompt variations to assess their impact on agent output quality.
  • Consistency Measurement: Ensure that the output of a plugin is consistent across repeated trials.
  • Quality Comparison: Compare the quality of two outputs to determine the better one.
  • Rubric Management: Create and manage custom rubrics for specific evaluation needs.
  • Calibration: Validate AI judge scores against human judgment to identify and mitigate biases.

Quick Start

To evaluate the quality of an AI agent's output, use the x-eval skill and specify the content and rubric for evaluation. For example, to score a code snippet using the 'code-quality' rubric, you would say: /xm:eval score "function add(a,b){return a+b}" --rubric code-quality

Frequently Asked Questions about x-eval

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I evaluate AI agent output quality using rubric scoring?

To evaluate AI agent output quality, you can use multi-rubric scoring by specifying the content and a predefined or custom rubric. This scores agent outputs against specific criteria to ensure quality and consistency.

What is the best way to benchmark different AI agent strategies?

Benchmarking AI agent strategies involves comparing different models or prompt strategies on the same task. This process analyzes performance differences by scoring outputs using predefined rubrics and measuring consistency across trials.

Can I run A/B testing for prompt variations to check agent performance?

Yes, you can conduct A/B testing with prompt variations to assess their impact on AI agent output quality. This involves comparing two outputs to determine which prompt variation produces better results.

Do I need configuration files to measure AI judge calibration and consistency?

Yes, configuration files are required for mode detection and judge composition. These files enable the system to validate AI judge scores against human judgment, mitigating biases and ensuring output consistency across repeated trials.

When should I not use multi-rubric scoring for AI agent evaluation?

Multi-rubric scoring may not be suitable if you lack defined evaluation criteria or configuration files for judge composition. Without custom rubrics or calibration data, the scoring system cannot accurately measure agent performance or mitigate biases.