ACP Extensions

[zanmato]

Any plans on implementing custom extensions like the "buffers" example here https://agentclientprotocol.com/protocol/extensibility#extension-methods ?
It would be great to get Claude Code to see which file I'm in, and even which line I have selected, like in VSCode.

I could contribute it myself, just wanted to check first if this is something planned or even something you'd like to do