Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/shopify/rubydex/agents-mdgit clone --depth 1 https://github.com/Shopify/rubydexWhat 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 | $0.01214 | $0.01214 |
| Opus 5 | $0.00607 | $0.00607 |
| Sonnet 5 | $0.00243 | $0.00243 |
| Haiku 4.5 | $0.00121 | $0.00121 |
Grade A, and why
rubydex 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 2d 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 2d ago First seen · 102 lines · 1,214 tokens per session scan A cce46a833d2f
rubydex AGENTS.md is an instructions file published in the GitHub repository Shopify/rubydex (326 stars, last pushed 6d ago), with no licence file. It adds 1,214 tokens to every session, about $0.0061 per session on Opus 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
CodeBoarding AGENTS.md
AGENTS.md instructions for CodeBoarding/CodeBoarding, covering system-wide recommendations for agent execution, 1. environment and virtual environment setup, 2. dependency and repository navigation, 3. code quality and testing standards and 4. execution flow and tool patterns.
agents-shipgate CLAUDE.md
Instructions for ThreeMoonsLab/agents-shipgate, covering claude code instructions, running the cli in this repository, permissions, output handling and slash command.
omen CLAUDE.md
Instructions for panbanda/omen, covering claude.md, build and development commands, setup git hooks (run once after clone), format code and run linter.
OpenLore AGENTS.md
Instructions for clay-good/OpenLore, covering openlore: llm agent instructions, agent role, core principles, workflow and step 1: codebase survey.
flyto-indexer AGENTS.md
Instructions for flytohub/flyto-indexer, covering agent rules, gate remediation loop, flyto2 project memory contract and flyto2 frontend quality gate.
contextception AGENTS.md
Instructions for kehoej/contextception, covering ai agent guidelines, getting oriented, development commands, code conventions and architecture quick reference.