Announcement January 25, 2026 · 4 min read

Introducing StyleMCP: Brand Rules for Every AI Output

Today we're launching StyleMCP, an open-source tool that validates and rewrites AI-generated content to match your brand voice. Whether you're using Claude, GPT, or any other model, StyleMCP ensures consistency.

The Problem We're Solving

AI is transforming how businesses create content. Marketing teams use it for copy. Support teams use it for responses. Product teams use it for documentation. But there's a catch: AI doesn't know your brand.

Every company has a voice. Some are playful, others are authoritative. Some avoid jargon religiously, others embrace technical precision. These aren't arbitrary preferences—they're the result of years of brand building, customer research, and hard-won market positioning.

When you plug AI into your workflow without guardrails, you get generic output. It might be grammatically correct and factually accurate, but it doesn't sound like you.

What StyleMCP Does

StyleMCP sits between your AI and your output. It validates content against your brand rules and optionally rewrites violations to match your voice.

Define Once, Enforce Everywhere

Your brand rules live in a style pack—a YAML file that captures your voice guidelines:

name: "acme-brand"
version: "1.0"

vocabulary:
  prefer:
    - "use" # instead of "utilize"
    - "help" # instead of "assist"
    - "buy" # instead of "purchase"
  forbid:
    - "leverage"
    - "synergy"
    - "circle back"

patterns:
  forbid:
    - "Click here"
    - "In today's [\\w]+ world"
    - "!!!+"

Multiple Integration Options

StyleMCP works however you work:

  • MCP Protocol: Native integration with Claude Desktop and MCP-compatible tools
  • REST API: Drop-in validation for any application
  • CLI: Validate files and pipelines from your terminal
  • GitHub Action: Catch brand violations in PR reviews

Why Open Source?

Brand voice isn't something you should outsource to a black box. You need to see exactly what rules are being applied and why content is being flagged.

StyleMCP is MIT licensed. Run it on your own infrastructure. Fork it. Extend it. Contribute back. The core validation engine will always be free and open.

What About the Cloud Version?

For teams that want managed infrastructure, we offer StyleMCP Cloud with:

  • Hosted API with 99.9% uptime SLA
  • Pre-built style packs for common industries
  • Team collaboration and version control
  • Analytics on brand compliance over time

But if you want to self-host, you always can.

Getting Started

The fastest way to try StyleMCP:

# Install the CLI
npm install -g stylemcp

# Validate some text
echo "Click here to leverage our synergies!" | stylemcp validate

# Output:
# ✗ Line 1: "Click here" - Use descriptive link text
# ✗ Line 1: "leverage" - Prefer simpler alternatives
# ✗ Line 1: "synergies" - Forbidden jargon
# Score: 35/100

Check out our documentation for full setup instructions, or sign up for a free Cloud account with 5,000 validations per month.

What's Next

This is just the beginning. On our roadmap:

  • Tone analysis: Go beyond vocabulary to detect formality, sentiment, and reading level
  • Auto-rewrite: Not just flag violations, but fix them automatically
  • Style learning: Upload examples of good content and let StyleMCP learn your patterns
  • More integrations: Notion, Google Docs, Slack, and more

We're building StyleMCP in public. Follow our progress on GitHub, and let us know what features matter most to you.

Your brand voice took years to develop. Don't let AI dilute it in seconds.

Try StyleMCP Free

5,000 free validations per month. No credit card required.

Get Started →