Claude Code plugin
Better Harness
An open-source Harness Engineering platform for coding agents—define harnesses as code, run controlled experiments, inspect evidence, and compare outcomes. Turn task evidence into actionable team and organization insights.
Install
/plugin marketplace add QoderAI/better-harnessFound in the project README. Check it for setup steps after installing.
git clone https://github.com/QoderAI/better-harness.gitFrom the README
Better Harness English · 简体中文 Delegate coding to agents. Improve the loop around them. Better Harness provides open-source insights for the Agent Work Loop. It runs through your Coding Agent and turns project and session evidence into prioritized improvements and verifiable next steps. Missing evidence stays explicit. Website · Choose your host · Sample report · Docs Quick start Analyze and improve your coding workflow with: Claude Code, Codex Desktop, Codex CLI, Qoder Desktop/CLI, Cursor, or GitHub Copilot CLI. Choose the host you already use to get its exact installation, verification, invocation, and report-output steps. Better Harness does not use one universal entrypoint across every host. This README shows inline setup for the most common hosts. Additional supported hosts (Qwen Code, Pi, Kimi Code, WorkBuddy, and Grok) keep their steps and boundaries in the installation guide and the public Host Adapter Matrix; see More adapters. README placement is a display choice, not a support-level claim. Better Harness scopes behavior claims to relevant Task Episodes and the surrounding project mechanisms. Qoder and Cursor produce host-native Canvas reports; Claude Code, Codex, Qwen Code, GitHub Copilot, and Kimi Code produce self-contained HTML with paired Markdown. Missing or partial evidence remains explicit. See the Host Adapter Matrix for current coverage and output differences. See it in action The report keeps missing evidence explicit and turns supported gaps into prioritized findings with an impact, expected output, scoped repair, and acceptance checks. Open the complete self-contained English HTML report (source). For delivery tracing, the interactive Harness Inspector follows product intent through agent activity, sessions,…
How plugins work
- A plugin bundles slash commands, subagents, skills, hooks, MCP servers and status lines so they install together.
- Add the marketplace inside Claude Code with /plugin marketplace add QoderAI/better-harness, then run /plugin to pick what to install.
- You can turn a plugin off again from /plugin without deleting anything.
Details
- Repository
- QoderAI/better-harness
- Website
- qoderai.github.io/better-harness
- Language
- JavaScript
- License
- MIT
- Last updated
- 20 October 2026
- Topics
- agent-pluginclaude-codecodexcursorharness-designharness-engineeringloop-engineeringqoderskill
- Listed in
- jqueryscript/awesome-claude-code
FAQ
What is Better Harness?
An open-source Harness Engineering platform for coding agents—define harnesses as code, run controlled experiments, inspect evidence, and compare outcomes. Turn task evidence into actionable team and organization insights. It is a plugin for Claude Code, from QoderAI/better-harness on GitHub.
How do I install Better Harness?
Run /plugin marketplace add QoderAI/better-harness inside Claude Code, then follow the setup in the README.
Is Better Harness popular?
QoderAI/better-harness has 2,435 GitHub stars and 204 forks, and is included in 1 curated Claude Code list. It was last updated on 20 October 2026.
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