Stylemcp

StyleMCP

Executable brand rules for AI models and agents. Keep every AI-generated message on-brand.

What is StyleMCP?

StyleMCP validates and rewrites AI-generated text to match your brand voice. Use it as:

• REST API - Validate text from any application
• MCP Server - Direct integration with Claude and other AI agents
• CLI - Check copy in your terminal or CI/CD
• GitHub Action - Catch off-brand copy in pull requests

Quick Start

API

curl -X POST https://stylemcp.com/api/validate \

-H "Content-Type: application/json" \ -d '{"text": "Click here to learn more!"}'

Response:

{

"valid": false, "score": 65, "violations": [ { "rule": "no-click-here", "severity": "error", "message": "Avoid 'click here' - describe the destination instead", "suggestion": "Learn more about our features" } ] }

CLI

# Install

npm install -g stylemcp

Validate text

stylemcp validate "Click here to learn more"

Validate file

stylemcp validate src/copy/homepage.json --pack saas

Rewrite text

stylemcp rewrite "Please utilize our product" --mode aggressive

MCP (Claude Desktop)

Add to your claude_desktop_config.json:

{

"mcpServers": { "stylemcp": { "command": "npx", "args": ["stylemcp"] } } }

Now Claude can validate and rewrite text using your brand rules.

API Endpoints

Style Packs

StyleMCP uses style packs - YAML files that define your brand rules.

Available Packs

Example: saas Pack

• Vocabulary: Prefer "use" over "utilize", "help" over "assist"
• Forbidden words: "synergy", "leverage", "cutting-edge", "game-changing"
• Patterns to avoid: "click here", "we're sorry for any inconvenience"
• CTA rules: Avoid "Submit", "Click here", "OK" - prefer "Save", "Create", "Sign up"

Pack Structure

packs/

my-brand/ manifest.yaml # Pack metadata voice.yaml # Tone, vocabulary, forbidden words copy_patterns.yaml # Reusable copy templates cta_rules.yaml # Button/CTA guidelines tokens.json # Design tokens (optional)

Create Your Own Pack

# Copy the default pack

cp -r packs/saas packs/my-brand

Edit the rules

nano packs/my-brand/voice.yaml

Use your pack

curl -X POST https://stylemcp.com/api/validate \ -d '{"text": "Your text", "pack": "my-brand"}'

voice.yaml Example

tone:

summary: "Friendly, clear, and helpful" attributes:

• name: friendly weight: 0.8
• name: professional weight: 0.7

vocabulary: rules:

• preferred: "use" avoid: ["utilize", "leverage"]
• preferred: "help" avoid: ["assist", "facilitate"]

forbidden:

• "synergy"
• "paradigm shift"
• "game-changing"

doNot:

• pattern: "click here" reason: "Poor accessibility" suggestion: "Describe the destination" severity: error

• pattern: "\\b(obviously|simply|just)\\b" isRegex: true reason: "Can make users feel stupid" severity: warning

Self-Hosting

Docker

# Clone the repo

git clone https://github.com/3DUNLMTD/stylemcp.git cd stylemcp

Set up environment

echo "STYLEMCP_API_KEY=$(openssl rand -hex 32)" > .env

Run with Docker

docker compose up -d

Check health

curl http://localhost:3000/health

Manual

# Install dependencies

npm install

Build

npm run build

Start server

npm start

GitHub Actions

name: Brand Check

on: [pull_request]

jobs: validate: runs-on: ubuntu-latest steps:

• uses: actions/checkout@v4

• name: Validate copy run: | npx stylemcp validate src/copy/*.json \ --min-score 80 \ --format github

Environment Variables

MCP Tools

When used as an MCP server, StyleMCP provides these tools:

What Gets Validated?

The saas pack checks for:

Vocabulary

• Use simple words: "use" not "utilize", "help" not "assist"
• Avoid jargon: "synergy", "leverage", "paradigm shift"
• Avoid weak intensifiers: "very", "really", "extremely"

Patterns

• No "click here" (accessibility issue)
• No "we're sorry for any inconvenience" (corporate non-apology)
• No double "please" (sounds desperate)
• No starting with "Sorry" (lead with solutions)

CTAs

• Avoid generic: "Submit", "OK", "Yes/No", "Click here"
• Use specific actions: "Save", "Create", "Sign up", "Export"
• Max 4 words

Constraints

• Max 25 words per sentence
• No exclamation marks (in most contexts)
• First-person plural ("we", "our")
• Oxford comma

License

MIT