https://x.com/yulintwt/status/2017837578473619732?s=20
Skills teach Claude how to do something.
If multiple agents or conversations need the same expertise—like security review procedures or data analysis methods—create a Skill rather than building that knowledge into individual subagents. Skills are portable and reusable, while subagents are purpose-built for specific workflows.
MCP connects Claude to data; Skills teach Claude what to do with that data
Specialized expertise
https://platform.claude.com/cookbook/skills-notebooks-01-skills-introduction
Quick Reference: When to Use What
| Tool | Best For |
|---|---|
| Skills | Reusable procedural knowledge across conversations |
| Prompts | One-time instructions and immediate context |
| Projects | Persistent background knowledge within workspaces |
| Subagents | Independent task execution with specific permissions |
| MCP | Connecting Claude to external data sources |
Use Skills when: Capabilities should be accessible to any Claude instance. They're portable expertise.
Use Subagents when: You need self-contained agents designed for specific purposes with independent workflows and restricted tool access.