# Thinking Reasoning

> An animated, collapsible AI thinking block whose shimmering label expands to stream the agent's reasoning, then folds into a "Thought for Ns" summary.

- Author: [kvnkld](https://21st.dev/@kvnkld)
- Library: AIcss
- License: MIT
- Tags: Thinking, Reasoning, AI, Chat, Collapsible
- Live preview: https://21st.dev/@kvnkld/components/thinking-reasoning

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/kvnkld/thinking-reasoning?api_key=$API_KEY_21ST"
```

Requires a 21st API key (generate one at https://21st.dev/mcp) passed as `API_KEY_21ST`. Free accounts get a limited number of installs per day; unlimited on a paid plan — see https://21st.dev/pricing.

Full component directory: https://21st.dev/llms.txt · More like this: https://21st.dev/community/components/s/thinking.md