Agent Client Protocol

I’m excited to introduce the Personal Brain Agent, a new AI plugin for Obsidian.md that seamlessly integrates a powerful agent into your second brain. While AI agents are a well-tested concept among software engineers, my goal with this plugin is to make this powerful technology accessible to a broader, non-technical audience. This post is a deep dive into its features, demonstrating how anyone can transform their workflow by moving beyond simple chatbots.

In my previous article, From MCP to ACP - A New Standard in AI Agent Interoperability, I explored the evolving landscape of AI agent protocols. This month, I put theory into practice by integrating the Gemini-CLI agent into my favorite note-taking tool, Obsidian.md. The result is a working MVP of a plugin I’m calling Personal Brain, which seamlessly embeds an AI agent into your second brain.

After a recent update to the Zed editor, I noticed it now includes native support for AI agents like Gemini CLI and Claude Code. What is surprising is not the integration itself, but the collaborative effort behind it. Zed Industries, together with Google, announced the Agent Client Protocol (ACP), an open standard designed to do for AI agents what the Model Context Protocol (MCP) did for tools: enable developers to focus on building the best possible agents without getting bogged down by integration complexities.

Inspired by the Language Server Protocol (LSP) and MCP (Model Context Protocol), the protocol was jointly designed, with Zed focusing on the editor (client) and Google on the agent. The initial announcement from Zed provides a deeper dive into their vision of unbundling AI agents from IDEs.