Borrowing it
Nothing to install: this file belongs to jrenaldi79/harness-engineering. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/jrenaldi79/harness-engineering/main/CLAUDE.mdgit clone --depth 1 https://github.com/jrenaldi79/harness-engineeringWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/jrenaldi79/harness-engineering/claude-md)<a href="https://agentmods.dev/instructions/jrenaldi79/harness-engineering/claude-md"><img src="https://agentmods.dev/badge/instructions/jrenaldi79/harness-engineering/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/jrenaldi79/harness-engineering/claude-md"><img src="https://agentmods.dev/badge/instructions/jrenaldi79/harness-engineering/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.01447 | $0.01447 |
| Opus 5.5 | $0.00579 | $0.00579 |
| Sonnet 5.5 | $0.00289 | $0.00289 |
| Haiku 4.5 | $0.00145 | $0.00145 |
Grade C, and why
harness-engineering CLAUDE.md scanned grade C with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- prettier-ignore-start --> How it starts
The opening of the file, as written. The whole thing — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code when working with code in this repository.
Project Overview
harness-engineering is a Claude Code plugin and reference for AI coding agent harnesses. The full plugin provides /readiness and /setup; the independent documentation plugin provides /documentation:documentation. Together they assess and configure projects, with a README mapping 20+ best practices from industry sources.
Core Features
/readiness: Scores a codebase across 8 pillars and 5 maturity levels, produces a saved report with delta tracking/setup: Scaffolds CLAUDE.md files, enforcement scripts, git hooks, linter configs, and agent settings via Socratic questioning- Reference guide: Maps best practices from OpenAI, Anthropic, Augment Code, Factory.ai, and practitioners to concrete implementation patterns
Essential Commands
Testing
node --test tests/documentation/*.test.js
node --experimental-vm-modules node_modules/.bin/jest tests/scripts/ # Unit tests for setup scripts
bash tests/evals/run-evals.sh # E2E readiness evals (default)
bash tests/evals/run-evals.sh --config setup-eval-config.json # E2E setup evals
bash tests/evals/test-marketplace-install.sh # Test plugin install flow
Validation
node scripts/repo-generate-docs.js --check # Verify indexes and compact markers
node scripts/repo-generate-docs.js --staged # Validate the exact staged snapshot
Setup
bash scripts/install-hooks.sh # Install git hooks (pre-commit + pre-push)
Architecture
- skills: 46 files
- scripts: 6 files
- tests: 41 files
- plugins: 11 files
Data Flow
User installs plugin
-> /readiness reads templates/references as benchmark
-> 3 parallel subagents evaluate project against 8 pillars
-> Scored report saved to readiness-report.md
User runs /setup
-> Socratic questions determine stack and goals
-> Scripts scaffold project structure, configs, hooks
-> Enforcement scripts copied to target project's scripts/
-> Git hooks wired to run enforcement on every commit/push
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago Changed · +1 lines · +21 tokens per session 9ed0d11c7e05
- 9d ago Changed · +6 lines · +8 tokens per session scan A → C 695e22a01da4
- 21d ago Changed · -71 lines · -1,373 tokens per session b9c2925371d5
- 1mo ago First seen · 213 lines · 2,791 tokens per session scan A ae50f040ffd1
harness-engineering CLAUDE.md is an instructions file published in the GitHub repository jrenaldi79/harness-engineering (123 stars, last pushed 9d ago), licensed MIT. It adds 1,447 tokens to every session, about $0.0058 per session on Opus 5.5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
ai-agent-rules-generator agent-observations.instructions.md
Mandatory agent observation logging — anomalies, recommendations, and critical findings must be disclosed before commit.
ai-agent-rules-generator doc-sync.instructions.md
Documentation sync rules — which docs to update when code changes.
ruleProb copilot-instructions.md
Instructions for canblmz1/ruleProb, a project described as: Test whether your CLAUDE.md, AGENTS.md and .cursor/rules actually survive AI agent execution. Extract rules, generate sandbox scenarios, score compliance.
ai-agent-rules-generator ui-design.instructions.md
Glitch Payment Gateway admin UI design rules — mandatory element & component reference for WooCommerce settings.
ai-agent-rules-generator ratelimitting.instructions.md
Instructions for savedpixel/ai-agent-rules-generator, covering rate limit prevention (critical), rules, output length limits and visibility.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).