# How Theo Browne actually uses coding agents

T3 Stack, T3 Chat, T3 Code

**If you take one thing:** `T3 Code`, his own GUI over every agent. He built the app he works in: one window over Claude Code, Codex and the rest, and the repo expects most contributions to come from T3 Code itself.

- **Agent:** Claude Code (app) ([source, 2026-09-27](https://x.com/theo/status/2104079585956761814))
- **Agent:** Codex (app) ([source, 2026-09-03](https://x.com/theo/status/2095609789711831286))
- **Model:** Opus 5.5 ([source, 2026-09-27](https://x.com/theo/status/2104339496942948401))
- **Model:** Muse Wonder ([source, 2026-10-12](https://x.com/theo/status/2109731846842196093))
- **Review:** Opus asks Wonder for code review; agents merge when confident ([source, 2026-10-12](https://x.com/theo/status/2109731846842196093))
- **At once:** 40+ threads ([source, 2026-09-23](https://x.com/theo/status/2102704338582032575))
- **Harness:** T3 Code on a spare Ubuntu box over ssh, not macOS ([source, 2026-09-26](https://x.com/theo/status/2103710437951131865))
- **Rules file:** AGENTS.md with "A note from Theo"; CLAUDE.md just imports it ([source, 2026-10-06](https://github.com/pingdotgg/t3code/blob/9bd1d8009a6b7c50f9dd9458e2bf27d481ff3b43/AGENTS.md#L33-L35))
- **Skills:** contribution-triage, test-t3-app, test-t3-mobile ([source, 2026-10-02](https://github.com/pingdotgg/t3code/tree/9bd1d8009a6b7c50f9dd9458e2bf27d481ff3b43/.agents/skills))
- **Hooks:** UserPromptSubmit, PreToolUse, Stop -> Claude Blocker ([source, 2026-01-01](https://github.com/t3-content/claude-blocker/blob/06f03fa2c229dde4ab4c02c5c24955a42a504d09/README.md#L15-L21))

## In their words

> With much, much effort, I have been able to kill ~3.5 $200 Claude Code accounts in the past 5 days.

> Astra had made Codex more essential than ever due to its unique strengths.

> Fable 5.1 xhigh to Opus 5.5 high (move I made) is a 6.6x increase

> I often have Opus ask Wonder for code review, copy work, and architecture review

> I regularly have 40+ threads running concurrently.


Archetype (our label): Swarm Lord. Newest source: 2026-10-12.
Card: https://www.prehistoriq.com/stacks/t3dotgg/ · Data: https://github.com/prehistoriq/stacks/blob/main/data/stacks/t3dotgg.json