Clerk Custom UI

What it does

When your agent uses it

• Custom sign-in/sign-up flows
• Appearance styling
• Visual customization

Example prompts

• “/clerk-custom-ui”

Requirements

• Node.js
• Pre-approved tools (allowed-tools): WebFetch

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

1. 1Custom authentication flows — build your own sign-in/sign-up UI with hooks
2. 2Appearance customization — theme, style, and brand Clerk's pre-built components

What it can do on your machine

Read from SKILL.md and the folder at commit e5554c5. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • WebFetch

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • npm

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • clerk.com

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Clerk Custom UI loads about 1.6k tokens when it runs. Until then it costs about 55 tokens; SKILL.md has 551 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~55

When it runs · the whole SKILL.md, loaded when a task matches

~1.6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from geekskai/blog at commit e5554c5, republished under its MIT licence (© geekskai). 551 words, ~1,620 tokens.

name

clerk-custom-ui

description

Custom authentication flows and component appearance - hooks (useSignIn, useSignUp), themes, colors, fonts, CSS. Use for custom sign-in/sign-up flows, appearance styling, visual customization, branding.

allowed-tools

WebFetch

license

MIT

metadata.author

clerk

metadata.version

2.3.0

<SignIn
  appearance={{
    variables: {
      colorPrimary: '#0000ff',
      borderRadius: '0.5rem',
    },
    options: {
      logoImageUrl: '/logo.png',
      socialButtonsVariant: 'iconButton',
    },
  }}
/>

npm install @clerk/ui

import { dark } from '@clerk/ui/themes'

<ClerkProvider appearance={{ theme: dark }} />

import { dark, neobrutalism } from '@clerk/ui/themes'

<ClerkProvider appearance={{ theme: [dark, neobrutalism] }} />

import { shadcn } from '@clerk/ui/themes'

<ClerkProvider appearance={{ theme: shadcn }} />

@import 'tailwindcss';
@import '@clerk/ui/themes/shadcn.css';

© geekskai, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 5 other files in .agents/skills/clerk-custom-ui of geekskai/blog.

• SKILL.md
• core-2/custom-sign-in.md
• core-2/custom-sign-up.md
• core-3/custom-sign-in.md
• core-3/custom-sign-up.md
• core-3/show-component.md

Open the folder on GitHubat commit e5554c5

Used in 2 other repositories

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in geekskai/blog, which our catalogue first saw on October 7, 2026.

• growupanand/ConvoForm.agents/skills/clerk-custom-ui
• adrianhajdin/react-native-lingua.agents/skills/clerk-custom-ui