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/mryll/skills/claude-mdgit clone --depth 1 https://github.com/mryll/skillsWrote 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/mryll/skills/claude-md)<a href="https://agentmods.dev/instructions/mryll/skills/claude-md"><img src="https://agentmods.dev/badge/instructions/mryll/skills/claude-md.svg" alt="Measured on agentmods" 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 | $0.00089 | $0.00089 |
| Opus 5 | $0.00044 | $0.00044 |
| Sonnet 5 | $0.00018 | $0.00018 |
| Haiku 4.5 | $0.00009 | $0.00009 |
Grade C, and why
skills 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 4d 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.
<!-- This file imports the cross-tool AGENTS.md (read by Codex, Cursor, Copilot, Amp). Claude Code does not natively read AGENTS.md as of May 2026; the @-import is the official workaround documented at: https://code.clau What it actually says
@AGENTS.md
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.
- 4d ago First seen · 13 lines · 89 tokens per session scan C 3d630c97ff8a
skills CLAUDE.md is an instructions file published in the GitHub repository mryll/skills (3 stars, last pushed 4d ago), licensed MIT. It adds 89 tokens to every session, about $0.0004 per session on Opus 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 2026-08-31.
Other instructions, from other repositories
unit-tests-skills CLAUDE.md
Claude Code instructions for mavka-ai/unit-tests-skills, covering claude.md, what this repo is, repository structure, available skills and workflow.
unit-tests-skills AGENTS.md
AGENTS.md instructions for mavka-ai/unit-tests-skills, covering agents.md, skills, rules location, plugin validation and what it checks, and why each check exists.
anchor copilot-instructions.md
Instructions for peva3/anchor, covering github copilot instructions, required reading, critical rules, prohibited actions and project structure.
ai-agent-instruction-modules AGENTS.md
Instructions for tablackburn/ai-agent-instruction-modules, covering ai agent instructions, instructions for ai agents, instruction applicability matrix, available instruction files and quick reference.
Harness-for-codex AGENTS.md
Instructions for ganimjeong/Harness-for-codex, covering codex harness instructions, commands, repository layout, operating principles and task loop.
agent-cli AGENTS.md
AGENTS.md instructions for VictorTomaili/agent-cli, covering agents.md, what this is, install / update / init, working in this checkout and conventions to preserve.