Automated harness evolution for AI agents. A Claude Code plugin that iteratively optimizes system prompts, routing, retrieval, and orchestration code using full-trace counterfactual diagnosis. Based on Meta-Harness (Lee et al., 2026).
raphaelchristi/harness-evolver
Skill Claude CodeCodex
Use when the user wants to smoke-test the evolve pipeline, test tools, or verify the plugin works end-to-end. Also use when the user says 'dry run', 'smoke test', or 'test pipeline'.
raphaelchristi/harness-evolver
Skill Claude CodeCodex
Use when the user wants to release a new version, publish to npm, create a GitHub release, bump version, or tag a release. Also use when the user says 'release', 'publish', 'bump version', 'tag', or 'npm publish'.
raphaelchristi/harness-evolver
Skill Claude CodeCodex
Use when the user wants to validate the plugin, check integrity, verify cross-references, or before a release. Also use when the user says 'validate', 'check plugin', or 'verify'.
raphaelchristi/harness-evolver
Skill Claude CodeCodex
Use when the user wants to verify that the evolved agent's score is stable and reliable. Runs evaluation multiple times and reports mean ± std.
raphaelchristi/harness-evolver
Skill Claude CodeCodex
Use when the user is done evolving and wants to finalize, clean up, tag the result, or push the optimized agent.
raphaelchristi/harness-evolver
Skill Claude CodeCodex
Use when the user wants to run the optimization loop, improve agent performance, evolve the agent, or iterate on quality. Requires .evolver.json to exist (run harness:setup first).
raphaelchristi/harness-evolver
Skill Claude CodeCodex
Use when the user wants to check dataset quality, diagnose eval issues, or before running evolve. Checks size, difficulty distribution, dead examples, coverage, and splits. Auto-corrects issues found.
raphaelchristi/harness-evolver
Skill Claude CodeCodex
Use when the user wants to set up the evolver in their project, optimize an LLM agent, improve agent performance, or mentions evolver for the first time in a project without .evolver.json.
raphaelchristi/harness-evolver
Skill Claude CodeCodex
Use when the user asks about evolution progress, current scores, best version, how many iterations ran, or whether the loop is stagnating.