# Guides

> Guides to building UI with a coding agent and a design system, each with an install line or a rule pair from a shipped design.how system.

- [Approval UI for AI agents that people read](https://design.how/guides/approval-ui-for-ai-agents.md) (2026-10-19): An approval UI for an AI agent asks inside the turn, says what the call will do and ends a refusal as denied. The rules and block Quartz ships for it.
- [How to design a tool call UI people can scan](https://design.how/guides/tool-call-ui-rules.md) (2026-10-19): Tool call UI rules from Quartz, each with the code an agent gets wrong: a seq on every event, explicit status, and a denied call that is not an error.