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/plagueho/github-copilot-assets-library/copilot-instructionsgit clone --depth 1 https://github.com/PlagueHO/github-copilot-assets-libraryWhat 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 | $0.00840 | $0.00840 |
| Opus 5 | $0.00420 | $0.00420 |
| Sonnet 5 | $0.00168 | $0.00168 |
| Haiku 4.5 | $0.00084 | $0.00084 |
Grade A, and why
github-copilot-assets-library 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 — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.
This is a GitHub Copilot Assets Library that provides customization assets including Copilot Instructions, Prompt Files, Custom Chat Modes, and MCP Server configurations.
Core Commands
- Documentation: Use README.md as the primary source - contains comprehensive asset descriptions
- No build/test commands: This is a documentation/asset library with no compiled code
- File validation: Ensure Markdown syntax is valid for
.chatmode.md,.prompt.mdand.instruction.mdfiles
Repository Architecture
Major Components
.github/copilot-instructions.md- Repository-level Copilot instructions (n)/prompts/- Reusable prompt files for common tasks/chatmodes/- Custom chat modes with specialized instructions and tools/instructions/- Custom instruction files for Copilot/mcp/- Sample Model Context Protocol (MCP) server configurations for external integrations.devcontainer/- Development container for standardized environment
Key Asset Types
- Prompt Files: Task-specific prompts (create specs, GitHub issues, code reviews)
- Chat Modes: Specialized modes (expert engineers, planners, mentors, Azure modules)
- MCP Servers: External integrations (Microsoft Docs, GitHub, Playwright, Giphy, Azure DevOps)
Style Rules
File Naming
- Chat modes:
[descriptive-name].chatmode.md - Prompts:
[descriptive-name].prompt.md - Instructions:
[descriptive-name].instructions.md - Use lowercase with hyphens for file names
Markdown Standards
- Follow front matter YAML structure exactly as shown in examples
- Use proper heading hierarchy (# ## ###)
- Include description and tools array in chat mode front matter
- Include mode and description in prompt file front matter
Content Guidelines
- Precise Language: Use explicit, unambiguous instructions
- Structured Format: Use headings, bullets, tables for clarity
- No Boilerplate: Avoid generic advice, focus on specific guidance
- Self-Contained: Each asset should be complete and context-independent
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 First seen · 78 lines · 840 tokens per session scan A 77e3bb2db46e
github-copilot-assets-library copilot-instructions.md is an instructions file published in the GitHub repository PlagueHO/github-copilot-assets-library (84 stars, last pushed 1mo ago), licensed MIT. It adds 840 tokens to every session, about $0.0042 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 2026-08-30.
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