MotionLint MCP Server

Catch bad animations before they ship. Deterministic motion audit + vision-LLM design review.

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What is the MotionLint MCP server?

Catch bad animations before they ship. Deterministic motion audit + vision-LLM design review. The motionlint mcp server wraps that behind the Model Context Protocol, so an assistant can use it rather than through you.

What it actually does

Deterministic — measured from the live page, no LLM involved. One-time prerequisite: npx playwright install chromium.

Adding it to your client

motionlint on npm is all you need. Most clients run it directly, so configuration is a few lines and a restart.

Configuration

You will need 3 environment variables: ANTHROPIC_API_KEY, OPENAI_API_KEY, GOOGLE_API_KEY. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.

Caveats

  • It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
  • Missing credentials fail quietly in some clients — if no tools show up, check the environment block first.
  • MCP clients confirm each tool call by default. Leave that on until you have watched what the motionlint mcp server does with a few real requests.

When to reach for it

This sits in the AI and media services group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. It is maintained by bobaba99; worth a glance at recent repository activity before you build anything load-bearing on it.

We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.

How to install the MotionLint MCP server

{
  "mcpServers": {
    "motionlint": {
      "command": "npx",
      "args": ["-y", "motionlint"],
      "env": {
        "ANTHROPIC_API_KEY": "your-value",
        "OPENAI_API_KEY": "your-value",
        "GOOGLE_API_KEY": "your-value"
      }
    }
  }
}

Add to claude_desktop_config.json, then restart Claude Desktop.

Configuration

VariableDescriptionRequired
ANTHROPIC_API_KEYCredential the server authenticates with.Yes
OPENAI_API_KEYCredential the server authenticates with.Yes
GOOGLE_API_KEYCredential the server authenticates with.Yes

Frequently asked questions

It connects MotionLint to MCP-compatible AI assistants such as Claude and Cursor. Instead of copying data back and forth by hand, the assistant works with MotionLint directly.