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Directory / Claude community plugins (Anthropic) / harness-evolver

harness-evolver

plugin Software development

Autonomous LLM agent optimization using LangSmith. Spawns 5 parallel proposers in git worktrees, evaluates candidates via LangSmith experiments, and merges winners automatically. Includes evaluator agent (LLM-as-judge via langsmith-cli), critic, architect, and testgen agents. No external API keys needed beyond LangSmith.
Description from the marketplace entry / plugin manifest.

Information source

Copied from the Claude community plugins (Anthropic) catalog (anthropics/claude-plugins-community), maintained by Anthropic (community submissions).

Links are pinned to commit 06ec7b6 (2026-10-13), the version we synced. Not reviewed by us.

Install

Add the marketplace (once, in Claude Code)
/plugin marketplace add anthropics/claude-plugins-community
In a Claude Code session
/plugin install harness-evolver@claude-community
From your shell
claude plugin install harness-evolver@claude-community

Commands follow each host's documentation (Claude Code, Claude Cowork docs). gh skill needs GitHub CLI 2.90 or later and is in public preview.

Listed from Anthropic (community submissions)'s catalog, not reviewed by us. Read the source before installing.

Catalog
Claude community plugins (Anthropic) (claude-community)
Information source
marketplace.json in anthropics/claude-plugins-community
Author
Not stated in the source
Source code
raphaelchristi/harness-evolver
Homepage
github.com/raphaelchristi/harness-evolver
License
MIT (repository license)
Repository stars
57 for raphaelchristi/harness-evolver
Added to catalog
2026-04-07
Last change
2026-04-18 (last push to the repo)

What it contains

Hosted in an external repository, so contents are not counted here. See the source link.

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