Borrowing it
Nothing to install: this file belongs to MountainUnicorn/add. 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/MountainUnicorn/add/main/AGENTS.mdgit clone --depth 1 https://github.com/MountainUnicorn/addWrote 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/mountainunicorn/add/agents-md)<a href="https://agentmods.dev/instructions/mountainunicorn/add/agents-md"><img src="https://agentmods.dev/badge/instructions/mountainunicorn/add/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/mountainunicorn/add/agents-md"><img src="https://agentmods.dev/badge/instructions/mountainunicorn/add/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 | $0.00462 | $0.00462 |
| Opus 5.5 | $0.00185 | $0.00185 |
| Sonnet 5.5 | $0.00092 | $0.00092 |
| Haiku 4.5 | $0.00046 | $0.00046 |
Grade A, and why
add 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 1mo 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.
What it actually says
ADD
ADD (Agent Driven Development) solves this by bringing structured, specification-driven SDLC practices to AI-native development—just as TDD revolutionized testing and DDD revolutionized domain modeling, ADD provides a proven methodology for human-AI collaboration at scale.
Engagement Protocol
The human is the architect and decision maker; the agent is the builder. Gather requirements via one-question-at-a-time interviews. Never batch questions. When stepping away, declare autonomy ceilings explicitly — the agent may climb local → dev → staging but never merges to main or ships to production without human approval.
Spec-First Invariants
Every feature flows through the document hierarchy: PRD → Feature Spec → Implementation Plan → User Test Cases → Automated Tests → Implementation. No link may be skipped. Specs live in specs/, plans in docs/plans/. Code changes without a corresponding spec are rejected on review.
Maturity & Autonomy Ceiling
Project maturity: beta.
- local: auto-promotion not declared.
Production deploys and merges to the default branch always require human approval.
Currently Active Spec
None in flight. Last shipped: specs/codex-agent-prefixing.md (v0.11.0), specs/init-defaults.md, specs/doctor.md, specs/codex-install-manifest.md (v0.10.2). Current focus: GA promotion (docs/milestones/v1.0-ga.md) — marketplace approval pending.
Pointers
.add/config.json— project configurationdocs/prd.md— product requirementsspecs/— feature specificationscore/rules/— behavioral rules (ADD-managed projects)
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.
- 1mo ago First seen · 35 lines · 462 tokens per session scan A 339832eb2a8f
add AGENTS.md is an instructions file published in the GitHub repository MountainUnicorn/add (11 stars, last pushed 22d ago), licensed MIT. It adds 462 tokens to every session, about $0.0018 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 2026-08-30.
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.