Codex Drove My Mac and “cua” Showed Up — Tracing ChatGPT.app's Bundled cua_repl and How It Relates to the OSS cua-driver

After letting Codex operate Keynote on my Mac, the session log showed a tool named mcp__cua_repl. The “cua” reminded me of trycua/cua-driver, whose code I had read earlier, but a shared name is not evidence of a shared implementation. Inspecting ChatGPT.app 26.928.21956 read-only, mcp__cua_repl leads to a NodeREPL launched by @oai/cua-repl, the tinyskyAlt entry point of @oai/cua, the @oai/sky service, and Codex Computer Use.app (bundle ID com.openai.sky.CUAService). No dependency on, bundled copy of, or string reference to trycua's cua-driver turned up, and trycua's own public issues treat Codex's bundled Computer Use as a separate provider.

Drawing Hand-Drawn Style Diagrams with AI Using Excalidraw MCP Server & Agent Skill

With Excalidraw MCP Server & Agent Skill, you can have AI draw hand-drawn style diagrams with just a prompt. Here's the setup process and tips on changing the port.

Reading Hermes Agent v2026.9.7 Computer Use Internals — Capture as Target Binding and Background-First Verify → Escalate

I wrote two Hermes Computer Use posts recently (a selection review and a macOS setup log), and while watching the agent drive Calculator in the background I kept wanting to know what a single computer_use call actually does under the hood. This article is that follow-up: a code-reading tour pinned to Git tag v2026.9.7, tracing one model tool call through to a real OS action and back. Along the way it hits the five design forks I found most instructive: capture doubling as sticky-target binding, background-first with verify → escalate, mutation-safe behavior on MCP timeout, the three image return routes, and the two separate approval layers between Hermes and cua-driver.

How to Call MCP Tools from Cursor

How to call MCP tools from Cursor. The conclusion is that they are only available in Agent mode.

MCP (Model Context Protocol) Technical Introduction

A compilation of reference information including official documentation, implementation examples, security considerations, and interesting use cases that I encountered while learning about MCP (Model Context Protocol), which has been gaining attention recently.