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AI Dev Tools

The Third Era of AI Software

Michael Truell, CEO of Cursor, on why the age of synchronous agents is already ending — and what fleet-based autonomous development means for every builder.

A few years ago, most code was written one keystroke at a time. Tab autocomplete changed that. Then agents arrived. Now something bigger is replacing even that.

Michael Truell, CEO of Cursor, the dominant AI coding tool, calls it the third era. And it's already here inside his own company.

📈 Agent usage in Cursor has grown 15x in the last year
🔄 March 2025: 2.5x more Tab users than agent users
🔄 Now: 2x more agent users than Tab users — completely flipped
🤖 35% of PRs merged at Cursor are now created by autonomous agents

The Three Eras

Era 1 — Tab Autocomplete. AI completes the low-entropy repetitive work. One keystroke at a time. Lasted about two years.

Era 2 — Synchronous Agents. Developers direct agents through prompt-and-response loops. Still human-in-the-loop at every step. Lasted less than a year.

Era 3 — Cloud Agents. Agents that tackle large tasks independently, over hours or days, on their own virtual machines in the cloud. You hand off a task and move on. The agent returns with logs, video recordings, and live previews.

"Cursor is no longer primarily about writing code. It is about helping developers build the factory that creates their software."

What Actually Changes

In Era 2, developers guide every line of code. In Era 3, the human role shifts entirely: define the problem, set review criteria, evaluate output.

You're not a coder anymore. You're a director of agent fleets.

Why cloud agents change everything: Synchronous agents compete for resources on your local machine — you can only run a few at a time. Cloud agents each run on their own VM. You hand off a task and move on while it works for hours. Artifacts (logs, video recordings, live previews) give you enough context to evaluate output without reconstructing each session from scratch.

The Prediction

"A year from now, we think the vast majority of development work will be done by these kinds of agents."

The Tab era lasted two years. The synchronous agent era may not last one. The transition is accelerating faster than most people are prepared for.

What This Means

Every project in your ideas vault, NOCTURNE, DREAMZ, APEX, NEXUS, can be built this way. You define the problem and review criteria. Agent fleets build. You ship.

The most valuable skill isn't writing code. It's knowing precisely what to build and being able to evaluate whether an agent built it right.


Source: @mntruell on X · 3.9M views · Mar 1, 2026 · Summarised by Research Hub

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