Summary

• add a true built-in V2 plugin that supplies OpenCode's registered OAuth client ID for configured mcp.figma.com servers
• have the plugin reapply configured Figma servers through the existing MCP service after plugin activation
• preserve explicit client_id values and oauth: false
• configure the Figma remote MCP server in the existing .opencode/opencode.jsonc

Root cause

The first V2 plugin mutated decoded config after MCP had already captured it, so the SDK attempted dynamic client registration and Figma returned plain-text 403 Forbidden. The plugin now updates configured Figma servers through MCP.add, without importing the plugin from MCP or adding a new plugin framework.

Testing

• bun typecheck (packages/core)
• bun test test/plugin/figma.test.ts (packages/core)
• bun test test/mcp.test.ts (packages/core)
• fresh development service: mcp list reports figma needs authentication
• mcp auth figma emits a Figma authorization URL containing the registered client ID and waits for the loopback callback

Note

This carries the client ID from #32676 into V2 for checkout and team validation. The ID remains dependent on Figma approving OpenCode's OAuth client registration.