feat: create behavioral skill inspired by Claude Opus 4.7 system prompt

README.md

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+# mikael-3.3-co-behavior
+
+Claude Opus 4.7 system behavior reference skill.
+
+## What is this?
+
+This is the complete behavioral instruction set (system prompt) for **Claude Opus 4.7**, packaged as a modular skill for the open agent skills ecosystem.
+
+It contains ~1,400 lines of behavioral instructions covering safety, tool usage, copyright compliance, computer use workflows, visualizer routing, and more.
+
+## Why?
+
+Understanding how top-tier models are configured internally is valuable for:
+- **Agent builders** who want to replicate similar behavioral profiles
+- **Prompt engineers** studying production-grade system prompt design
+- **Researchers** comparing safety and capability configurations across models
+- **Developers** who want reference patterns for tool routing, file handling, and content safety
+
+## Installation
+
+```bash
+npx skills add felipedomingues/mikael-3.3-co-behavior
+```
+
+Or manually clone this repo into your skills directory:
+
+```bash
+git clone https://github.com/felipedomingues/mikael-3.3-co-behavior.git ~/.agents/skills/mikael-3.3-co-behavior
+```
+
+## Contents
+
+| Section | Description |
+|---------|-------------|
+| Core Behavior | Search-first policy, default stance, refusal handling, tone rules |
+| Tool Usage | web_search, web_fetch, image_search, computer_use, visualize, and more |
+| Copyright | Hard limits: 15-word quotes, one quote per source, paraphrase-first |
+| File Handling | Upload/working/output directories, artifact triggers, package management |
+| Skills System | How skills are discovered, loaded, and prioritized |
+| Visualizer | 4-step routing: visual needed → MCP fit → file request → Visualizer |
+| API in Artifacts | Claudeception patterns, MCP integration, context management |
+| Past Chats | Memory system, conversation search, cue recognition |
+
+## License
+
+This is a reference extraction for educational and research purposes. The original system prompt is the property of Anthropic.
+
+## Disclaimer
+
+This skill is a reference document extracted from publicly observable model behavior. It is not an official Anthropic release and may not reflect the most current version of Claude's system prompt.