Verifiers v1 Refactors Agent Evaluation Stack
willccbb · x · 2026-07-13
Prime Intellect released verifiers v1, refactoring the environment stack for agentic RL and evaluation.
Key change: splitting the environment into three parts:
- taskset: handles data and scoring
- harness: the shell that runs tasks
- runtime: the actual execution environment
The author highlights three improvements:
- Shift from "environment-centric" to "rollout-centric" abstraction, clearer
- Trace becomes a first-class citizen for analyzing long-horizon tasks
- Graph-structured traces avoid prefix duplication, ideal for long task analysis
Additionally, the same taskset can run under different harnesses (e.g., kimi-code, rlm, codex), making evaluation more suitable for comparing different systems on the same task.
Related event: Prime Intellect Releases verifiers v1 for Agentic RL(10 posts)→
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