Log into figma MCP

What is it for?

Figma MCP rejects non-whitelisted agents, including OpenCode. This almost no-dependncy code allows to authenticate and create the mcp-auth.json file.

For context and alternatives, see anomalyco/opencode#988

Authenticating

npm i
npm run build
npm start https://mcp.figma.com/mcp

Add to MCP

Then move or merge mcp-auth.json into ~/.local/share/opencode/mcp-auth.json

Other MCPs?

This was only tested with Figma.