What problem does it solve? Choosing between coding agents like Claude Code, Aider, or Codex usually relies on anecdotal impressions rather than data. This Skill replaces guesswork with reproducible head-to-head benchmarks that measure pass rate, cost, time, and consistency on your own real tasks. ## Core Features & Use Cases - Declarative Task Definitions: Define benchmark tasks in YAML with prompts, target files, pinned commits, and judge criteria (pytest, grep patterns, or LLM-as-judge). - Isolated Agent Runs: Each run executes in a fresh git worktree, so agents cannot interfere with each other or corrupt the base repository. - Comparison Reports: Generate tabular reports comparing agents across pass rate, API cost, wall-clock time, and consistency over repeated runs. - Use Case: Before adopting a new coding agent for your team, define five tasks representative of your workload, run each agent three times per task, and select the winner based on measured pass rate and cost. ## Quick Start Ask the agent to define a YAML benchmark task for your repository and run a head-to-head comparison of two coding agents with three runs each.