What is a Claude skill? What is it called in code?

Imagine this: you are a highly intelligent person, but your wisdom is too vast. How do you handle everything in this world comprehensively?
The answer is that you need a set of internal and external skills.
The internal skill is your agentsmd document. Your internal skill is your core, and it will tell your agent the logic and philosophy of doing things. For example, a trader's trading philosophy is: no matter how the market moves, stay calm and go with the trend.
This is an internal skill, not an external one. It’s like a philosophy guiding a person on how to act.
So, what is a Claude skill? It’s your external skill.
AI will encounter various problems. For example, if you need it to open a webpage for you, what does it do? It doesn’t know how to call a browser. Even if it’s very smart, it’s just guessing blindly.
As I mentioned, a highly intelligent person doesn’t necessarily cover everything. No matter how skilled you are, if suddenly asked to cross an ocean to the other side, you might not be able to do it. That’s why you need skills.
What are skills? Usually, they don’t occupy your thinking. But when you need to cross an ocean, if your brain has the skill to do so, you’ll know what to do. AI is the same—it will go chop trees to build a boat. That’s a skill.
If everyone is completely unfamiliar, you can understand it this way: this is the truth about skill and agentmd.