Extensions

Terminology note. This skill is about extensions — the framework's user-authored mini-app primitive (sandboxed Alpine.js HTML rendered in an iframe). It is NOT the same thing as LLM "tools", which are the function-calling primitives the AI agent uses (actions, MCP tools, etc.). Other skills still talk about "the agent calls actions as tools" — that's the LLM concept and stays as-is. When this doc says "tool" without qualification, it means LLM tool. When it says "extension", it means the sandboxed mini-app.

Historical naming: extensions were previously called "tools". The physical SQL table names (tools, tool_data, tool_shares) and a few legacy in-iframe globals (toolFetch, toolData) are kept for back-compat — see the back-compat table in references/api.md.

References