Define frontmatter for custom slash commands in Claude Code

When you create a custom slash command, Claude Code pulls the first sentence of your prompt file as its description. That works, but we can do better by defining our own metadata using frontmatter.

Frontmatter is a header area at the top of a text file, wrapped between two sets of triple dashes. Inside those dashes, we define key-value pairs that control how our command behaves:

---
key1: value
key2: value
---

Claude Code looks for specific frontmatter properties: