Claude Code skills are SKILL.md packages that extend the agent on demand. Custom slash commands merged into skills; follows the Agent Skills standard.

Specialized Claude Code workers with their own context, tools, and permissions. Use them so research and logs do not flood the main session.

Anthropic's previous Opus snapshot: 200k context, $5/$25 per 1M tokens. Later billed lines include Opus 4.6 and Opus 5.

Anthropic's previous Sonnet snapshot: 200k context, $3/$15 per 1M tokens. Docs now sell newer Claude 4.6 and Claude 5 lines.

Claude Haiku 4.5: live cheap/fast Claude row at $1/$5 per 1M tokens and 200k context. Rechecked 2026-08-18. Not leftover 3 Haiku.

Claude Sonnet 5: live mid-tier Claude row at $2/$10 per 1M tokens and 1M context. Rechecked 2026-08-18. Not leftover Sonnet 4.5.

Anthropic agent library. Rechecked: claude-agent-sdk, not anthropic-sdk-python. Python 7,910 stars, MIT.

Anthropic's official meta-skill creation tool with templates and best practices for creating high-quality Claude Skills.

Anthropic's official collaboration tool that enables Claude AI to work directly with your computer files through an intuitive GUI interface.

Anthropic's official brand guidelines skill with brand assets and design standards, enabling Claude to automatically follow corporate brand consistency.

Anthropic's official DOCX skill for comprehensive document creation, editing, and analysis with support for tracked changes, comments, formatting preservation, and text extraction.

Anthropic's official skill for creating distinctive, production-grade frontend interfaces with high design quality for web components, pages, and applications.

Anthropic's official skill providing resources for writing internal communications like status reports, leadership updates, company newsletters, FAQs, and incident reports.

Anthropic's official guide for creating high-quality MCP (Model Context Protocol) servers in Python (FastMCP) or Node/TypeScript to enable LLMs to interact with external services.

Anthropic's official PDF processing skill that teaches Claude Agent how to extract text, create, merge, or split PDF documents.

Anthropic's official skill providing knowledge and utilities for creating animated GIFs optimized for Slack with proper dimensions, file sizes, and creative animations.

Anthropic's official toolkit for styling artifacts with 10 pre-set professional themes or generating custom themes on-the-fly for slides, docs, and HTML.

Anthropic's official suite of tools for creating elaborate, multi-component claude.ai HTML artifacts using React, Tailwind CSS, and shadcn/ui.

Anthropic's official toolkit for interacting with and testing local web applications using Playwright for frontend functionality verification and debugging.