Borrowing it
Nothing to install: this file belongs to posit-dev/skills. 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/posit-dev/skills/main/AGENTS.mdgit clone --depth 1 https://github.com/posit-dev/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/posit-dev/skills/agents-md)<a href="https://agentmods.dev/instructions/posit-dev/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/posit-dev/skills/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/posit-dev/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/posit-dev/skills/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 | $0.01139 | $0.01139 |
| Opus 5.5 | $0.00456 | $0.00456 |
| Sonnet 5.5 | $0.00228 | $0.00228 |
| Haiku 4.5 | $0.00114 | $0.00114 |
Grade A, and why
skills 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 20d 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 — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
This file provides guidance to coding agents (e.g., Posit Assistant, Claude Code, Codex, Cursor) when working with code in this repository.
What This Repository Is
A collection of Agent Skills published by Posit PBC. Skills are structured markdown files, following the Agent Skills specification, that teach coding agents specialized workflows (e.g., Shiny app development, R package testing, GitHub PR workflows). There is no application code to build, compile, or deploy — the primary artifacts are Markdown files consumed directly by coding agents that support the Agent Skills format.
Utility Scripts
Two runnable utilities live at the repo root.
count-skill-tokens.py reports line and token counts for a skill:
# Requires uv
./count-skill-tokens.py shiny/shiny-bslib
# or
uv run count-skill-tokens.py r-lib/r-cli
Warns when SKILL.md exceeds 5,000 tokens / 500 lines, or when the skill description frontmatter exceeds 100 tokens.
find-stale-references.py finds references to old skill names after a rename, so stale mentions don't linger in the repo or in users' projects:
# Check the default r-lib r-* prefix renames
./find-stale-references.py [paths...]
# High-confidence path references only (e.g. "r-lib/cli/SKILL.md")
./find-stale-references.py --kinds path
# Check a custom rename
./find-stale-references.py --rename old-name=new-name ~/my-project
Bare name mentions are also reported but need review: the old name may refer to an R package (cli), a website (cli.r-lib.org), or an ordinary word (lifecycle) rather than the skill. Exits non-zero when matches are found, so it can gate CI.
Directory Structure
<category>/
README.md # Category-level notes (optional per skill)
<skill-name>/
SKILL.md # Required: skill definition with YAML frontmatter
references/ # Optional: supplementary docs loaded on demand
*.md
scripts/ # Optional: R or shell helpers
templates/ # Optional: document templates
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.
- 20d ago First seen · 106 lines · 1,139 tokens per session scan A c2250a6b5afc
skills AGENTS.md is an instructions file published in the GitHub repository posit-dev/skills (548 stars, last pushed today), licensed MIT. It adds 1,139 tokens to every session, about $0.0046 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 2026-10-08.
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).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.