Repository of the Day - mukul975/Anthropic-Cybersecurity-Skills, and Daily Trends - June 21, 2026

Published: 6/21/2026

This daily roundup highlights repository momentum from GitGenius analytics for June 21, 2026, using UTC daily deltas in stars and subscribers.

The scan reviewed 1974 repositories, with 1823 repos contributing star deltas and 1823 repos contributing subscriber deltas.

Repo of the day

mukul975/Anthropic-Cybersecurity-Skills led the day with +553 stars to 17608 total stars and +6 subscribers to 133 total subscribers. The mukul975/anthropic-cybersecurity-skills repository is a comprehensive, open-source library designed to equip AI agents with advanced, structured cybersecurity skills. It contains 754 production-grade skills spanning 26 distinct security domains, such as cloud security, threat hunting, malware analysis, digital forensics, web application security, and more. Each skill is meticulously crafted to reflect real-world workflows and decision-making processes used by experienced cybersecurity analysts, rather than generic scripts or checklists.

A standout feature of this repository is its unified mapping to five major industry frameworks: MITRE ATT&CK (v18), NIST Cybersecurity Framework (CSF 2.0), MITRE ATLAS (v5.4), MITRE D3FEND (v1.3), and NIST AI Risk Management Framework (AI RMF 1.0). This cross-framework approach ensures that every skill is aligned with both offensive and defensive tactics, organizational security postures, AI/ML adversarial threats, and regulatory compliance requirements. For example, a single skill like "analyzing-network-traffic-of-malware" is mapped across all five frameworks, providing broad applicability and compliance coverage.

The repository follows the agentskills.io open standard, which enables seamless integration with a wide range of AI platforms and code assistants, including Claude Code, GitHub Copilot, OpenAI Codex CLI, Cursor, Gemini CLI, and over 20 other platforms. The skills are structured for efficient discovery and execution: each skill features a YAML frontmatter for rapid scanning and metadata extraction, followed by a detailed Markdown body outlining trigger conditions, prerequisites, step-by-step workflows, and verification procedures. Reference files and helper scripts are included to provide deep technical context and operational support.

The library addresses the critical cybersecurity workforce gap, which reached 4.8 million unfilled roles globally in 2024. By providing AI agents with structured domain knowledge and practitioner playbooks, the repository enables these agents to perform tasks at the level of senior analysts, such as memory forensics, threat detection, incident response, and vulnerability management. This structured approach allows agents to make informed decisions, execute complex workflows, and validate results, rather than relying on ad-hoc commands or incomplete information.

Coverage is extensive across all major frameworks. For MITRE ATT&CK, the skills span all 14 tactics and over 200 techniques, with visual mapping provided via ATT&CK Navigator layer files. NIST CSF 2.0 alignment includes all six functions and 22 categories, reflecting the latest updates and expanded scope. MITRE ATLAS and D3FEND mappings support AI/ML-specific threats and defensive countermeasures, while NIST AI RMF ensures alignment with trustworthy AI development and regulatory requirements.

The repository is widely recognized in the cybersecurity and AI communities, featured in multiple "awesome" lists and skills directories. It is actively maintained, with regular updates and community contributions encouraged. Users can try the skills live via the Casky.ai playground, participate in the Global Agentic AI Readiness Survey, and integrate the library into their own AI agents with minimal setup. Licensed under Apache 2.0, the project is open for both commercial and academic use, making it a valuable resource for organizations, developers, and researchers seeking to enhance AI-driven cybersecurity capabilities.

Fastest rising repos

• chopratejas/headroom - +2447 stars (44223 total), language: Python. Compress tool outputs, logs, files, and RAG chunks before they reach the LLM. 60-95% fewer tokens, same answers. Library, proxy, MCP server.
  
• mattpocock/skills - +1516 stars (139680 total), language: Shell. Skills for Real Engineers. Straight from my .claude directory.
  
• obra/superpowers - +771 stars (234962 total), language: Shell. An agentic skills framework & software development methodology that works.
  
• Egonex-AI/Understand-Anything - +757 stars (65329 total), language: TypeScript. Graphs that teach > graphs that impress. Turn any code into an interactive knowledge graph you can explore, search, and ask questions about. Works with Claude Code, Codex, Cursor, Copilot, Gemini CLI, and more.
  
• Leonxlnx/taste-skill - +651 stars (48395 total), language: JavaScript. Taste-Skill - gives your AI good taste. stops the AI from generating boring, generic slop
  

Subscriber surge

• obra/superpowers - +8 subscribers (877 total), +771 stars. An agentic skills framework & software development methodology that works.
  
• multica-ai/andrej-karpathy-skills - +6 subscribers (1007 total), +471 stars. A single CLAUDE.md file to improve Claude Code behavior, derived from Andrej Karpathy's observations on LLM coding pitfalls.
  
• mukul975/Anthropic-Cybersecurity-Skills - +6 subscribers (133 total), +553 stars. 754 structured cybersecurity skills for AI agents · Mapped to 5 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND & NIST AI RMF · agentskills.io standard · Works with Claude Code, GitHub Copilot, Codex CLI, Cursor, Gemini CLI & 20+ platforms · 26 security domains · Apache 2.0
  
• ruvnet/RuView - +5 subscribers (530 total), +114 stars. π RuView turns commodity WiFi signals into real-time spatial intelligence, vital sign monitoring, and presence detection — all without a single pixel of video.
  
• bytedance/deer-flow - +5 subscribers (315 total), +551 stars. An open-source long-horizon SuperAgent harness that researches, codes, and creates. With the help of sandboxes, memories, tools, skill, subagents and message gateway, it handles different levels of tasks that could take minutes to hours.
  

Hidden gems

• micytao/vllm-playground - +2 stars to 476 total stars, 6 subscribers. A modern web interface for managing and interacting with vLLM servers (www.github.com/vllm-project/vllm). Supports both GPU and CPU modes, with special optimizations for macOS Apple Silicon and enterprise deployment on OpenShift/Kubernetes.
  
• VictoriaMetrics/victoriametrics-datasource - +1 stars to 155 total stars, 11 subscribers. Grafana datasource for VictoriaMetrics
  
• observIQ/bindplane-otel-collector - +1 stars to 183 total stars, 8 subscribers. Bindplane’s distribution of the OpenTelemetry collector providing a simple and unified solution to collect, refine, and ship telemetry data anywhere
  
• littlehorse-enterprises/littlehorse - +1 stars to 382 total stars, 7 subscribers. LittleHorse Server: Workflow Engine for Microservice Orchestration & Business-as-Code, and the core of the Saddle Command Center
  
• databricks-solutions/databricks-apps-cookbook - +1 stars to 176 total stars, 6 subscribers. Ready-to-use code snippets for building interactive Databricks Apps.
  

Language movers

• python - +14272 stars across 319 repos. Example repos: microsoft/agent-lightning, openai/gpt-oss, volcengine/MineContext
• typescript - +7842 stars across 207 repos. Example repos: nrwl/nx, amantus-ai/vibetunnel, QwenLM/qwen-code
• shell - +3239 stars across 22 repos. Example repos: VoltAgent/awesome-claude-code-subagents, frankbria/ralph-claude-code, obra/superpowers
• rust - +2853 stars across 70 repos. Example repos: BloopAI/vibe-kanban, farion1231/cc-switch, firecracker-microvm/firecracker
• javascript - +2352 stars across 50 repos. Example repos: react/react, badlogic/pi, thedotmack/claude-mem

Category spotlight

• machine learning - +5238 stars across 180 repos. Example repos: amantus-ai/vibetunnel, openai/gpt-oss, onnx/onnx
• automation - +3884 stars across 112 repos. Example repos: microsoft/agent-lightning, shiyu-coder/Kronos, disler/claude-code-hooks-mastery
• javascript - +3323 stars across 46 repos. Example repos: react/react, google/adk-js, a2ui-project/a2ui
• ai - +2768 stars across 64 repos. Example repos: frankbria/ralph-claude-code, anthropics/skills, multica-ai/multica
• responsive design - +2730 stars across 14 repos. Example repos: tailwindlabs/tailwindcss, thedaviddias/Front-End-Checklist, elastic/eui

Maintainer watch

• chopratejas - +2447 stars across 1 repos. Example repos: chopratejas/headroom
• mattpocock - +1579 stars across 5 repos. Example repos: mattpocock/skills, mattpocock/sandcastle, mattpocock/dictionary-of-ai-coding
• microsoft - +1092 stars across 29 repos. Example repos: microsoft/terminal, microsoft/agent-lightning, microsoft/VibeVoice
• anthropics - +788 stars across 10 repos. Example repos: anthropics/skills, anthropics/claude-plugins-official, anthropics/knowledge-work-plugins
• obra - +771 stars across 1 repos. Example repos: obra/superpowers