Hi. Will McGugan here. I built Toad. Ask me anything.
First, from my reading of the ACP doc, one thing that seems pretty janky is if the ACP client wants to expose a tool to the agent, e.g. if Toad wanted to add the ability for the agent to display pretty diffs. In the doc they recommend stdio to the ACP server, then stdio to an MCP server, and then some out of band network request back to the ACP client. Have you thought about this, or found a better solution working on Toad?
Similarly, it would be useful to be able to expose a tool which runs a subagent using ACP using a different agent, e.g. if I'm using Claude for coding but I'd like to invoke codex for code review. Have you thought about doing anything like this? Is it feasible over the protocol?