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.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 5.1 | $0.03596 | $0.03596 |
| Opus 5 | $0.01798 | $0.01798 |
| Sonnet 5 | $0.00719 | $0.00719 |
| Haiku 4.5 | $0.00360 | $0.00360 |
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 8d 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 — 259 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, instructions, and chat modes, 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
│ └── Chat Modes/ # Custom chat mode configurations
├── 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
│ ├── agent/ # Chat-mode equivalents (agent: build / agent: plan)
│ ├── 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/{agent,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/agent/and~/.config/opencode/command/
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.
- 8d 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 (3 stars, last pushed 10d ago), licensed Unlicense. It adds 3,596 tokens to every session, about $0.0180 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 2026-08-31.
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