harness-kit

harness-kit

A self-improving agent harness for Claude Code, distributed as a plugin.

What's included

Meta-harness (/harness) with 6 modes:

• bootstrap — Analyze your project, install relevant skills/agents, generate project-specific additions
• update — Pull latest upstream changes, smart-merge with local modifications
• add — Install skills from external plugin marketplaces
• audit — 10-step quality gate on your project's harness
• retro — Post-session gap identification (Type A/B/C/D classification)
• hoist — Propose upstream PRs for generic improvements

14 skills:

Skill	Purpose
/harness	Meta-harness management
/commit	Conventional commits with quality gates
/open-pr	PR creation with CI polling and review monitoring
/review-pr	Structured PR review using 6-dimension code review
/pr-comments	Reply to PR review comments in thread context
/rebase	Rebase with conflict resolution and validation
/code-reviewer	6-dimension code review reference
/skill-writer	Create well-structured skills with progressive disclosure
/documentation-writer	Write scannable, layered documentation
/harness-builder	Analyze codebases and recommend harness setup
/feature-spec	Write feature specifications before implementation
/standup	Generate daily standup from git history
/ui-review	Accessibility and UX audit (WCAG 2.1 AA)
/svg-logo-designer	Generate SVG logos

3 agents:

Agent	Model	Purpose
code-reviewer	sonnet	6D review: correctness, design, readability, performance, testing, security
verifier	haiku	Stack-agnostic validation runner
harness-builder	sonnet	Deep-read codebase and recommend harness

Architecture patterns reference — 6 multi-agent coordination patterns (Pipeline, Fan-out/Fan-in, Expert Pool, Producer-Reviewer, Supervisor, Hierarchical Delegation).

Install

/plugin marketplace add dougborg/harness-kit
/plugin install harness-kit@harness-kit

Then in your project:

/harness bootstrap

This analyzes your project, recommends which skills/agents to install, copies them to .claude/, generates project-specific additions, and creates a .harness-lock.json tracking provenance.

How it works

1. Plugin provides skills globally — After install, all skills and agents are available in every project
2. /harness bootstrap copies to your project — Selected skills/agents go into .claude/ and are committed to your repo
3. Every repo is self-contained — Anyone cloning your repo gets the full harness without needing the plugin
4. /harness update syncs changes — Smart-merges upstream updates, preserving local modifications
5. .harness-lock.json tracks provenance — Which files came from where, what's been locally modified

Multi-source

You can install skills from multiple plugin marketplaces:

/harness add vercel-labs/agent-skills    # React/Next.js skills
/harness add pbakaus/impeccable          # Frontend design skills

The lock file tracks all sources.

Philosophy

• Quality over quantity — 14 skills, not 150. Each one is well-structured with progressive disclosure.
• Self-improving — /harness retro identifies gaps after sessions; /harness hoist proposes upstream improvements.
• Scripts over inline bash — Shell logic is extracted to testable scripts, not inlined in skills.
• Composition over duplication — Project-local skills extend upstream skills with project-specific flavor.

License

Apache-2.0