Borrowing it
Nothing to install: this file belongs to Ghosteken/agent-harness. 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/Ghosteken/agent-harness/main/AGENTS.mdgit clone --depth 1 https://github.com/Ghosteken/agent-harnessWrote 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/ghosteken/agent-harness/agents-md)<a href="https://agentmods.dev/instructions/ghosteken/agent-harness/agents-md"><img src="https://agentmods.dev/badge/instructions/ghosteken/agent-harness/agents-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/ghosteken/agent-harness/agents-md"><img src="https://agentmods.dev/badge/instructions/ghosteken/agent-harness/agents-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 | $0.03293 | $0.03293 |
| Opus 5.5 | $0.01317 | $0.01317 |
| Sonnet 5.5 | $0.00659 | $0.00659 |
| Haiku 4.5 | $0.00329 | $0.00329 |
Grade A, and why
agent-harness AGENTS.md scanned grade A with 0 findings 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 12d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 297 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
This file provides guidance to AI coding agents (Claude Code, Cursor, Copilot, Antigravity, etc.) when working with code in this repository.
Repository Overview
agent-harness is a production-grade collection of engineering skills and specialist agent personas for AI coding assistants (Claude Code, Cursor, Copilot, Gemini CLI, and others). Skills are step-by-step workflows that encode what senior engineers do consistently. Agent personas are specialist roles that apply those skills from a specific engineering perspective.
Agent Personas
twelve specialist personas are available in agents/. Each persona adopts a single engineering role and operates within its curated skill scope.
| Persona | Role | Trigger |
|---|---|---|
code-reviewer |
Senior Staff Engineer | Review any code change before merge |
security-auditor |
Security Engineer | Security audit, vulnerability detection |
test-engineer |
QA Engineer | Test strategy and coverage analysis |
web-performance-auditor |
Web Performance Engineer | Core Web Vitals and loading performance |
api-developer |
Senior API Engineer | API design, contract review, integration |
db-architect |
Senior Database Architect | Schema design, queries, migrations |
senior-devops |
Senior DevOps Engineer | Pipelines, IaC, containers, incidents |
senior-frontend-engineer |
Senior Frontend Engineer | UI components, accessibility, bundle size |
senior-cloud-architect |
Senior Cloud Architect | Cloud design, IAM, DR, cost |
senior-backend-engineer |
Senior Backend Engineer | Services, async, queues, caching |
ai-ml-engineer |
AI/ML Engineer | Prompts, RAG, LLM evaluation, AI safety |
senior-qa-engineer |
Senior QA Engineer | Feature verification, fix validation, regression checks |
Architecture: Command → invokes Agent persona → persona invokes Skill(s).
Each persona's Composition block (in its .md file) lists its curated skill scope — the 20 skills it may invoke. When an agent is active, invoke a skill from its scope by name: Use skill <skill-name> to.... Skills outside an agent's scope can be invoked manually or via a slash command at any time. The full scope registry is at scripts/agent-scopes.json.
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.
- 12d ago Changed · -4 tokens per session ec16b05b0e5b
- 19d ago Changed 69ed1910d6a2
- 1mo ago First seen · 297 lines · 3,297 tokens per session scan A 9857f14733af
agent-harness AGENTS.md is an instructions file published in the GitHub repository Ghosteken/agent-harness (4 stars, last pushed 7d ago), licensed MIT. It adds 3,293 tokens to every session, about $0.0132 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other instructions, from other repositories
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).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.