Mark Phelps

Latest · Building · 10 Oct 2026 · 6 min · 1,346 words

The engineering work I want to keep doing

I delegate implementation to agents while staying involved in design, evaluating larger features, and checking that the whole application works as I expect.

Also recent

All writing

Giving my AI agents access to my RSS reader

How I turned Cove, the Mac RSS reader I built, into an MCP server so my AI agents send me a daily digest in Discord while my library stays on my Mac.

Building

Running AI agents in devcontainers

How to use devcontainers to run AI agents like Claude Code and Codex in isolated environments you control, so you can skip the permission prompts.

Learning

Still shipping. Now with agents.

I'm a principal engineer learning new things, building useful tools, and figuring out what I want from my work. These are the field notes.

I work on the AI infrastructure team at Cloudflare. Before that I ran my own startup, Flipt, and before that I helped build GitHub Container Registry.

Things I make

All projects

Beta

Cove

A native Mac RSS reader that keeps the full article, and lets your agents read it too.

On sale

Vigil

Keeps your Mac awake while your coding agents work.

The letter

New essays by email. It costs nothing.