Extension not working which chatgpt on Arc browser (Chrome based)

[asdrubalivan]

Hi everyone,

I’ve been trying to use MCPs with Super Assistant, but at the moment I’m not getting any usable responses.

I’ve tested this on Arc browser (Chromium-based) as well as on plain Chromium, just to rule out browser-specific issues. In both cases, I’m able to successfully connect to our proxy server, so the connection itself seems fine. However, once I try to actually use the server, things break down.

What I’m observing is that tool calls do appear to be executed. For example, I installed a Supabase-based MCP, and I can see that the tool calls are being made. However, the responses are always empty. I also don’t see any indication on our proxy server that response payloads are being triggered or returned. From the client side, it looks like every tool call resolves to an empty response.

Because of this, the extension is essentially unusable right now.

To be thorough, I’ve tried:

Different browsers: Arc and Chromium

Different transport types: Server-Sent Events (SSE), standard stdin/stdout, and WebSocket

Different ChatGPT versions: 5.2, 5.2 (Thinking Mode), and 4.1

According to a YouTube comment, using ChatGPT v4.1 is suggested as a workaround, but even with v4.1 I’m still seeing the same behavior: tool calls appear to fire, but no responses ever come back.

Has anyone else encountered this issue, or does anyone have insight into what might cause responses to be dropped or not propagated back through the proxy?

Thanks in advance.