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Verifiers validate whether an agent successfully completed a task. Each environment type uses a different verification approach.
Explore live verifier examples at gym.scale.com.

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Comparison

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Choose Your Environment

Website Verifiers

State checks, log checks, and rubric evaluation for web apps

Desktop Verifiers

File comparison and rules-based evaluation for VMs

MCP Verifiers

LLM Judge and rubric claims for tool-use tasks

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Common Concepts

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Score Interpretation

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Result Statuses

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Next Steps

Task Design

Create tasks with verifiers

Data Packs

Configure initial environment state