Hi, I’m trying to connect Figma mcp to Antigravity. While trying to install Figma Dev Mode MCP in Antigravity gui (Manage MCP Servers tab) I get this error:
Error: [77271] Using automatically selected callback port: 14118 [77271] Discovering OAuth server configuration... [77271] [77271] Connecting to remote server: http://127.0.0.1:3845/sse [77271] Using transport strategy: http-first [77271] Connection error: TypeError: fetch failed at node:internal/deps/undici/undici:13502:13 at process.processTicksAndRejections (node:internal/process/task_queues:105:5) at async StreamableHTTPClientTransport.send (file:///home/user/.npm/_npx/705d23756ff7dacc/node_modules/mcp-remote/dist/chunk-F76MHFRJ.js:18464:24) { [cause]: Error: connect ECONNREFUSED 127.0.0.1:3845 at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1634:16) { errno: -111, code: 'ECONNREFUSED', syscall: 'connect', address: '127.0.0.1', port: 3845 } } [77271] Fatal error: TypeError: fetch failed at node:internal/deps/undici/undici:13502:13 at process.processTicksAndRejections (node:internal/process/task_queues:105:5) at async StreamableHTTPClientTransport.send (file:///home/user/.npm/_npx/705d23756ff7dacc/node_modules/mcp-remote/dist/chunk-F76MHFRJ.js:18464:24) { [cause]: Error: connect ECONNREFUSED 127.0.0.1:3845 at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1634:16) { errno: -111, code: 'ECONNREFUSED', syscall: 'connect', address: '127.0.0.1', port: 3845 } } : calling "initialize": EOF.
OS: Ubuntu 25.10
Antigravity Version: 1.14.2
VSCode OSS Version: 1.104.0
Commit: 450b6b28083d737992adc5d19637f22c95ffba7b
Date: 2026-01-13T02:07:24.766Z (1 wk ago)
Electron: 37.3.1
Chromium: 138.0.7204.235
Node.js: 22.18.0
V8: 13.8.258.31-electron.0
OS: Linux x64 6.17.0-8-generic
Language Server CL: 855455936
Error: [5385] Using automatically selected callback port: 14118 [5385] Discovering OAuth server configuration… [5385] [5385] Connecting to remote server: http://127.0.0.1:3845/sse [5385] Using transport strategy: http-first [5385] Connection error: TypeError: fetch failed at node:internal/deps/undici/undici:16416:13 at process.processTicksAndRejections (node:internal/process/task_queues:103:5) at async StreamableHTTPClientTransport.send (file:///Users/nipuchakraborty/.npm/_npx/705d23756ff7dacc/node_modules/mcp-remote/dist/chunk-65X3S4HB.js:19845:24) { [cause]: Error: connect ECONNREFUSED 127.0.0.1:3845 at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1637:16) { errno: -61, code: ‘ECONNREFUSED’, syscall: ‘connect’, address: ‘127.0.0.1’, port: 3845 } } [5385] Fatal error: TypeError: fetch failed at node:internal/deps/undici/undici:16416:13 at process.processTicksAndRejections (node:internal/process/task_queues:103:5) at async StreamableHTTPClientTransport.send (file:///Users/nipuchakraborty/.npm/_npx/705d23756ff7dacc/node_modules/mcp-remote/dist/chunk-65X3S4HB.js:19845:24) { [cause]: Error: connect ECONNREFUSED 127.0.0.1:3845 at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1637:16) { errno: -61, code: ‘ECONNREFUSED’, syscall: ‘connect’, address: ‘127.0.0.1’, port: 3845 } } : calling “initialize”: EOF.
Anyone found solution to this? Getting same error while configuring
Hi @TechMonk ,
Thank you for flagging the issue.The error ECONNREFUSED 127.0.0.1:3845 confirms that Antigravity is trying to connect to a specific port (3845), but the Figma MCP server is not running or has crashed during startup.
Please provide a Figma Personal Access Token in your configuration.
I have tried adding PAT to the the config file, but still unable to connect figma mcp to antigravity.
Tried to check what’s happening behind and here is the summary from gemini:
”Because Antigravity runs in a sandboxed Google agent environment, sometimes non-native MCP implementations (like Figma’s official npm builder vs the built-in Stitch engine) hit backend translation issues and fail to surface the extracted tools (mcp_Figma_...) to Antigravity’s exact prompt layer, despite the IDE itself successfully spinning the connection up in the background.”