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/mukul975/anthropic-cybersecurity-skills/copilot-instructionsgit clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-SkillsWhat 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 | $0.04437 | $0.04437 |
| Opus 5 | $0.02218 | $0.02218 |
| Sonnet 5 | $0.00887 | $0.00887 |
| Haiku 4.5 | $0.00444 | $0.00444 |
Grade A, and why
Anthropic-Cybersecurity-Skills copilot-instructions.md scanned grade A with 1 finding 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 yesterday.
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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- Use standard Unix tools (bash, Python, curl, etc.) How it starts
The opening of the file, as written. The whole thing — 547 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Copilot Instructions for Anthropic-Cybersecurity-Skills
Anthropic-Cybersecurity-Skills is the largest open-source cybersecurity skills library for AI agents, containing 817 production-grade skills mapped to 6 industry frameworks (MITRE ATT&CK, NIST CSF, MITRE ATLAS, MITRE D3FEND, NIST AI RMF, MITRE F3). This document guides Copilot agents contributing new skills and framework mappings.
Quick Facts
- Type: Open-source cybersecurity skills library + framework mapping hub
- Skills: 817 across 29 security domains
- Frameworks: 6 (MITRE ATT&CK v14, NIST CSF 2.0, MITRE ATLAS, MITRE D3FEND, NIST AI RMF, MITRE F3)
- Format: agentskills.io standard (YAML frontmatter + Markdown)
- License: Apache 2.0 (ethical use required)
- Community: Independent, community-created (not affiliated with Anthropic)
Repository Structure
Anthropic-Cybersecurity-Skills/
├── skills/ # 817 skill directories (kebab-case)
│ ├── abusing-dpapi-for-credential-access/
│ │ ├── SKILL.md # Frontmatter + detailed instructions
│ │ ├── LICENSE
│ │ ├── scripts/
│ │ │ └── process.py # Optional helper scripts
│ │ └── references/
│ │ ├── api-reference.md
│ │ ├── standards.md
│ │ └── workflows.md
│ └── ... (816 more)
├── mappings/ # Framework coverage & alignment
│ ├── mitre-attack/
│ │ ├── attack-navigator-layer.json
│ │ └── coverage-summary.md
│ ├── nist-csf/
│ ├── owasp/
│ └── README.md
├── docs/ # Additional documentation
├── index.json # Central skill registry (auto-generated)
├── CONTRIBUTING.md # Contribution guide
├── SECURITY.md # Ethical use & dual-use policies
└── CODE_OF_CONDUCT.md # Community guidelines
Build & Development
Prerequisites
- Git (for cloning and version control)
- Python 3.8+ (optional, for scripts/metadata generation)
- jq (optional, for JSON processing; useful for index.json queries)
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.
- yesterday First seen · 547 lines · 4,437 tokens per session scan A e17ff31d8586
Anthropic-Cybersecurity-Skills copilot-instructions.md is an instructions file published in the GitHub repository mukul975/Anthropic-Cybersecurity-Skills (31,693 stars, last pushed 8d ago), licensed Apache-2.0. It adds 4,437 tokens to every session, about $0.0222 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
AiSOC AGENTS.md
Instructions for beenuar/AiSOC, covering learned user preferences and learned workspace facts.
cyberskills-hub CLAUDE.md
Instructions for haporfirio/cyberskills-hub, covering cyberskills documentation hub, instrucao de routing, role context, top-50 keywords and domain lookup.
strix AGENTS.md
Instructions for usestrix/strix, covering strix — agent guide, using strix from an agent and contributing to this repo.
violin AGENTS.md
Instructions for Strategic-Automation/violin, covering strategic-automation/violin — ai developer guidance, 1. stack & setup, 2. mandatory verification commands, 3. code conventions & architecture and 4. git & branching strategy.
attackgen CLAUDE.md
Claude Code instructions for mrwadams/attackgen, covering claude.md, project overview, development commands, running the application and installing dependencies.
attackgen AGENTS.md
AGENTS.md instructions for mrwadams/attackgen, covering agents.md, project overview, development commands, running the application and installing dependencies.