claude-harnesses
claude-harnesses is a curated collection of hooks, skills, MCP recipes, slash commands, and subagents for long-running, safe, high-quality Claude Code-driven software development.
Claude Code should not be expected to succeed by intelligence alone. This repository provides the durable scaffolding around it: deterministic guardrails, resumable task memory, and reusable workflows for the work that comes up over and over (review, TDD, CI fix, security review, refactor, release check).
The user guide is published at s-hiraoku.github.io/claude-harnesses.
Four ways to install
Pick whichever fits how you usually adopt tooling.
1) Anthropic plugin marketplace (recommended)
From inside a Claude Code session:
/plugin marketplace add s-hiraoku/claude-harnesses
/plugin install full@claude-harnesses
Or install just the pack you need:
/plugin install pr-guardian-pack@claude-harnesses
/plugin install safety-pack@claude-harnesses
/plugin install tdd-pack@claude-harnesses
The same flow works non-interactively from the shell:
claude plugin marketplace add s-hiraoku/claude-harnesses
claude plugin install full@claude-harnesses
Available packs: safety-pack, verification-pack, review-pack, tdd-pack, pr-guardian-pack, long-running-pack, mcp-pack, full.
2) APM (Agent Package Manager)
APM is a cross-agent dependency manager that works with Claude Code, Cursor, Copilot, and others.
apm install s-hiraoku/claude-harnesses/full
# or pin to a tag
apm install s-hiraoku/claude-harnesses/tdd-pack#v0.1.0
Or declare the dependencies in apm.yml and run apm install to reproduce the same setup across machines.
3) gh skill install
gh skill install s-hiraoku/claude-harnesses tdd --scope project
gh skill install s-hiraoku/claude-harnesses review --scope user
4) npx skills add
npx skills add s-hiraoku/claude-harnesses --skill review
npx skills add s-hiraoku/claude-harnesses --all
For vendoring harness files directly into your repo without a plugin runtime, see scripts/install.sh.
See docs/installation.md for the full comparison.
What it ships
| Category | Items |
|---|
| Plugin packs | safety, verification, review, tdd, pr-guardian, long-running, mcp, full |
| Skills (15) | bug-fix, feature-implementation, refactor-safely, review, release-check, docs-updater, goal-manager, pr-guardian, tdd, security-review, simplify, fix-ci, deslop, long-running-orchestrator, empirical-prompt-tuning |
| Hooks (13) | secret-guard, dangerous-command-guard, branch-protection-guard, prompt-injection-detector, mcp-tool-allowlist, stop-verify, format-on-edit, typecheck-on-edit, test-on-edit, session-context-injector, cost-ceiling-guard, plan-required-on-large-change, session-end-summary |
| MCP recipes | GitHub, Playwright, Context7, Serena, Sequential-Thinking, Sentry |
| Slash commands | /verify, /review, /security-review, /tdd, /fix-ci, /pr-guardian, /checkpoint |
| Subagents | code-reviewer, security-auditor, tdd-test-writer, tdd-implementer, tdd-refactorer, ci-fixer |
| Settings presets | strict, default, experimental |
| CLAUDE.md templates | strict, frontend, library, nextjs |
Skill evaluation (quality gate)
Skills are prompts, and the author of a prompt can't judge its quality. Every skill in this repo goes through an empirical evaluation loop:
- Freeze 2–3 realistic scenarios with
[critical]-tagged requirements in evals/<skill>/scenarios.yaml.
- Dispatch fresh subagents (one per scenario, in parallel) via the Task tool.
- Score two-sided: executor self-report + frozen requirements checklist (pass/fail, accuracy, tool steps, duration).
- Apply the minimum fix; loop with a NEW subagent until improvements plateau.
- Append a passing entry to
evals/<skill>/ledger.md.
CI (eval-quality-gate.yml) blocks any PR that modifies skills/<name>/SKILL.md without a recent passing ledger entry. Trivial fixes can opt out with [skip-eval] in the PR description.
The method is published as the empirical-prompt-tuning skill. Full how-to and copy-paste prompt template: docs/skill-evaluation.md.
Why harnesses