Borrowing it
Nothing to install: this file belongs to tommyvo/useful-prompts. 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/tommyvo/useful-prompts/master/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/tommyvo/useful-promptsWrote 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/tommyvo/useful-prompts/copilot-instructions)<a href="https://agentmods.dev/instructions/tommyvo/useful-prompts/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/tommyvo/useful-prompts/copilot-instructions/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/tommyvo/useful-prompts/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/tommyvo/useful-prompts/copilot-instructions.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 | $0.04543 | $0.04543 |
| Opus 5.5 | $0.01817 | $0.01817 |
| Sonnet 5.5 | $0.00909 | $0.00909 |
| Haiku 4.5 | $0.00454 | $0.00454 |
Grade A, and why
useful-prompts copilot-instructions.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.
How it starts
The opening of the file, as written. The whole thing — 267 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Copilot Instructions for Useful Prompts
Project Overview
This is a reference library, not a running application. It contains reusable prompts and instructions, hand-maintained in parallel across four AI coding platforms: GitHub Copilot, Cursor, Claude Code, and Opencode CLI. Files are authored in Markdown with YAML frontmatter and are deployed via shell scripts to each tool's config directory.
CRITICAL: No build/test/lint commands exist. This is a content repository that deploys via shell scripts.
Repository Structure
├── Github Copilot/
│ ├── Prompt Files/ # Task-specific prompts (code review, commit messages, etc.)
│ │ └── deprecated/ # Retired prompts, kept for reference — never delete
│ └── Instructions/ # Language/framework-specific coding guidelines that auto-apply
├── Cursor/
│ └── Skills/<name>/SKILL.md # One folder per skill
├── Claude Code/
│ └── Skills/<name>/SKILL.md # One folder per skill
├── opencode/ # Pre-converted versions for Opencode CLI
│ ├── command/ # Task-prompt equivalents (agent: build)
│ └── README.md
├── install-copilot.sh # Installs to ~/Library/Application Support/Code/User/prompts (macOS)
├── install-cursor.sh # Installs to ~/.cursor/skills/
├── install-claude.sh # Installs to ~/.claude/skills/
├── install-opencode.sh # Installs to ~/.config/opencode/command/
├── AGENTS.md # Condensed agent-facing conventions
└── .github/ # Repository configuration (this file)
Deployment targets:
- GitHub Copilot (VS Code):
~/Library/Application Support/Code/User/prompts(macOS) or equivalent on other platforms - Cursor:
~/.cursor/skills/ - Claude Code:
~/.claude/skills/ - Opencode CLI:
~/.config/opencode/command/
Architecture: Four Platforms, One Prompt Library
Every prompt/skill exists as four parallel files with (mostly) identical body content and platform-specific frontmatter.
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 Changed · -19 lines · -448 tokens per session 7d344ca7c181
- 3d ago Changed · +3 tokens per session 9a50dd2de4a7
- 25d ago Changed · +5 lines · +434 tokens per session 34875667be87
- 1mo ago Changed · +22 lines · +958 tokens per session 234249bb1784
- 2mo ago First seen · 259 lines · 3,596 tokens per session scan A c3fd5f6227bf
useful-prompts copilot-instructions.md is an instructions file published in the GitHub repository tommyvo/useful-prompts (4 stars, last pushed 2d ago), licensed Unlicense. It adds 4,543 tokens to every session, about $0.0182 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).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.