21st Cli Use

21st CLI — find, install & generate from the terminal

The 21st CLI (npx @21st-dev/cli, bin 21st) is the command-line surface for the 21st.dev catalog. Search first, install what fits, and only hand-write UI when nothing matches. To publish your own components/themes/templates, use the 21st-registry skill; to publish a project's design as a theme, use 21st-design-sync.

Auth (do this once)

Two interchangeable credentials, both sent as the API key:

1. Login session — npx @21st-dev/cli login opens the browser and saves a

token to ~/.config/21st/auth.json. Best for interactive/dev machines.

1. API key — 21st_sk_… from https://21st.dev/mcp (or

https://21st.dev/settings/api-keys). Pass via --api-key or the TWENTYFIRST_TOKEN / API_KEY_21ST env var. Best for CI.

21st whoami shows the signed-in account; 21st usage shows tier + remaining free quota; 21st logout clears the saved login.

Metering

Metadata (search, previews, a theme's CSS) is free. Retrieving component code (21st get, install) and AI generation are metered per user: a small free daily quota, then a paywall (21st usage shows what's left). Community access / membership lifts the quota.

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Find

# Search everything (components + themes + templates)
21st search "pricing table" --limit 10
21st search button --type c        # components only (c | theme | template)
21st search dark --type theme
# Filters: --tag  --color  --sort  --free|--paid
#          --author  --mine --liked   --json for machine output

Always search before hand-writing a component — a close match is usually faster to install and adapt than to build from scratch.

Logos

21st logo discord            # search brand + UI SVG logos (free, no login)
21st logo "next js" --limit 5 --json

Prints each logo's name and SVG url(s) to curl straight into a project. Uses the open svgl.app library; free and unmetered on every plan.

Pull code

# Print a component's code + demo (by the id from search)
21st get 143 [--json]

# Print a theme's CSS (by a theme id from `search --type theme`)
21st theme  [--json]

Install

# Install a component into the current project (shadcn under the hood)
21st add /            # e.g. 21st add shadcn/button
21st add @/           # from a team library
# --print to dump the shadcn command instead of running it

21st add resolves the registry item, writes it to components/ui/.tsx, and installs npm deps with the project's package manager. Public/unlisted items also work with stock shadcn: npx shadcn@latest add "https://21st.dev/r//".

Generate

When nothing in the catalog fits, sketch it with 21st AI and iterate on it from the terminal — that whole loop (21st generate → generation → iterate → take) lives in the 21st-ai skill:

21st generate "a glassy pricing section with a monthly/yearly toggle"

Opens a preview; from there you edit any variant and pull its code. See the 21st-ai skill for the full generate/iterate/grab-code flow and metering.

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Bookmarks, teams & MCP config

21st bookmarks [--type component|theme|template]
21st bookmark  --type  [--remove]     # heart / un-heart
21st lists                          # your bookmark lists
21st list 

21st teams                          # your teams
21st team                   # a team's libraries
21st team-components  [--library ]

21st init --client cursor|claude|codex|vscode|windsurf [--write]   # write MCP config
21st install-skill                  # install the 21st skills globally

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: 21st-dev
• Source: 21st-dev/claude-code-plugin
• License: Apache-2.0

Install and usage instructions live in the source repository linked above.