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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

Related MCP server: tone-rewriter-ai-mcp

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

Method

Endpoint

Description

POST

/api/validate

Validate text against brand rules

POST

/api/rewrite

Rewrite text to match brand voice

POST

/api/validate/batch

Validate multiple texts

GET

/api/packs

List available style packs

GET

/api/packs/{pack}/voice

Get voice guidelines

GET

/api/packs/{pack}/ctas

Get CTA rules

GET

/api/mcp/sse

MCP SSE endpoint

POST

/api/mcp/call

MCP tool calls

Style Packs

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

Available Packs

Pack

Best For

Key Features

saas

B2B SaaS products

Professional, clear, helpful tone

ecommerce

DTC & retail brands

Friendly, conversion-focused, no pushy CTAs

healthcare

Medical & wellness

Compliant language, no cure claims, person-first

finance

Fintech & banking

Precise, risk-aware, no guaranteed returns

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

Variable

Description

Default

PORT

Server port

3000

STYLEMCP_API_KEY

API key for authentication

(none)

GITHUB_WEBHOOK_SECRET

GitHub webhook secret

(none)

MCP Tools

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

Tool

Description

validate_text

Validate text against brand rules

rewrite_to_style

Rewrite text to match brand voice

get_voice_rules

Get voice and tone guidelines

get_copy_patterns

Get approved copy patterns

get_cta_rules

Get CTA guidelines

get_tokens

Get design tokens

list_packs

List available style packs

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

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