AgentDisk: per-process SSD write tracker

Shows Mac users running multiple AI coding agents who is quietly writing to their SSD

Problem

Developers keep Codex, Claude Code, Cursor and Gemini running on their Macs, often on an always-on Mac mini, so indexing, caching and builds make background disk activity grow. SSD endurance is finite, yet users have no idea which process is writing or how much per day, especially after reports of Codex writing to disk continuously.

Solution

A macOS menu bar utility that ranks per-process read/write volume across today, 7 days, 30 days and lifetime windows with CSV export; it also surfaces SMART health, temperature, total host writes and endurance used, plus a live read/write rate in the menu bar.

Users

Developers running several AI coding agents, remote workers using a Mac as an always-on dev box, heavy local-build users worried about SSD lifespan

MVP

Per-process read/write ranking with time-window switching; live menu bar read/write rate; SMART and total host writes readout; CSV export; alert when daily writes exceed a threshold

Revenue

One-time purchase (~$15–25) with a free trial; later a per-device team subscription; optionally open-source core with a paid menu bar UI.

Why now

Massive local disk writes by coding agents only became common in the past year, Activity Monitor lacks long-horizon per-process aggregation, and no big vendor will build such a niche Mac tool—an indie can ship it in one to two weeks.