What is mskills copilot-instructions.md?

Repository instructions for mskills, a TypeScript command-line tool that shares reusable AI-agent instructions between tools such as Claude, Codex, Gemini, Copilot, and Cursor.

Use them when changing mskills commands, agent definitions, configuration, or skill-linking and copying logic.

They give coding agents clear rules about the technology stack, folder structure, testing, and how skills are managed.

How yurakawa/mskills configures GitHub Copilot

Reuse

Borrowing it

Nothing to install: this file belongs to yurakawa/mskills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/yurakawa/mskills/main/.github/copilot-instructions.md

Clone the repo

git clone --depth 1 https://github.com/yurakawa/mskills

Made for: GitHub Copilot.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/yurakawa/mskills/copilot-instructions/github.svg)](https://agentmods.dev/instructions/yurakawa/mskills/copilot-instructions)

Your own site

<a href="https://agentmods.dev/instructions/yurakawa/mskills/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/yurakawa/mskills/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/yurakawa/mskills/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/yurakawa/mskills/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,324 This file is loaded in full into every session.

When invoked 1,324 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.01324	$0.01324
Opus 5.5	$0.00530	$0.00530
Sonnet 5.5	$0.00265	$0.00265
Haiku 4.5	$0.00132	$0.00132

Measured 1mo ago against content hash c71bd92db4ab, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mskills 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 1mo 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.

.github/copilot-instructions.md · 153 lines

How it starts

The opening of the file, as written. The whole thing — 153 lines — stays where its author put it; the contents beside it link to each section on GitHub.

mskills - Copilot Instructions

Project Overview

mskills is a CLI tool designed to manage "Agent Skills" for various AI agents (Claude, Codex, Gemini, Copilot, Cursor) in a centralized way. It allows users to register skills, enable agents, and apply skills across different agent configurations through symbolic links or file copies.

Tech Stack

Language: TypeScript (strict mode enabled)
Runtime: Node.js (ES2022, ESM modules with .js extension imports)
Package Manager: npm
Testing: Vitest
CLI Framework: Commander.js
UI/Styling: chalk (terminal colors), ora (spinners)
Validation: Zod for runtime type checking

Architecture

Directory Structure

src/ - Source code in TypeScript
- agents/ - Agent definitions and management (base.ts, manager.ts)
- commands/ - CLI command implementations (add, remove, list, apply, agents)
- config/ - Configuration file management (~/.mskills.json)
- skills/ - Skill management logic
- index.ts - Main CLI entry point
dist/ - Compiled JavaScript output (not committed)
demo-skill/ - Example skill for demonstrations

Key Concepts

Skills: Directories containing agent instructions, registered with a name and path
Agents: Supported AI agents with their configuration directories (~/.claude/skills, ~/.copilot/skills, etc.)
Config: JSON file stored at ~/.mskills.json containing registered skills and enabled agents
Apply: Creates symbolic links (or copies) from skill directories to agent skill directories

Coding Standards

TypeScript Guidelines

Use strict mode - Already enabled in tsconfig.json
Avoid any type - Use proper typing or unknown with type guards
ESM imports - Always use .js extensions for local module imports (e.g., './config/index.js')
Use modern Node.js APIs - Prefer node:fs/promises, node:path, node:os imports
Commander types - Import types with import type { Command } from 'commander'
Error handling - Catch errors and display user-friendly messages with chalk.red()

Read the full file on GitHub · 153 lines

Changes

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.

1mo ago First seen · 153 lines · 1,324 tokens per session scan A c71bd92db4ab

Subscribe to this mod's changes

mskills copilot-instructions.md is an instructions file published in the GitHub repository yurakawa/mskills (3 stars, last pushed 6mo ago), licensed MIT. It adds 1,324 tokens to every session, about $0.0053 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.

agent-skill agent-skills ai-agents cli

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).

microsoft/vscode · 9,715 tokens

mskills: Instructions file for GitHub Copilot