### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### The Feature

Make the tool listing fetch the tools from the available servers on the `/v1/mcp/tools` concurrent. Right now it's too slow as it fetches tools from each server sequentially.

### Motivation, pitch

I'm working on providing an MCP Gateway using LiteLLM, and already have a few MCPs registered.

When users use the endpoint for listing their tools they often think it's stuck since it takes long to respond. Also for us as admins is good to have a quick endpoint for monitoring.

### What part of LiteLLM is this about?

Proxy

### LiteLLM is hiring a founding backend engineer, are you interested in joining us and shipping to all our users?

No

### Twitter / LinkedIn details

_No response_