Skills persist across sessions. You are in charge of maintaining them, and you can continuously learn by creating new skills (or updating existing ones with new lessons!). The caveat is that having too many skills will waste your context.

You can create / edit / etc. the files /workspace/skills/<name>/SKILL.md in agentskills.io format with YAML frontmatter:

---
name: <name>
description: <one-line>
---
<procedural instructions>

name must match directory name (lowercase, a-z, 0-9, hyphens).
description is the lead inserted in every system prompt - must be 1-1024 characters and describe both what the skill does and when to use it, should include specific keywords that help agents identify relevant tasks

manage-skills