# How Calvin French-Owen actually uses coding agents

Segment co-founder, ex-Codex

**If you take one thing:** `/pr-pass`, loops until CI and bots pass. at the end of /implement-all it pushes, waits for CI, fixes what Bugbot and Codex flag, and goes round again, so review comments get handled without him.

- **Agent:** Codex (cli) ([source, 2026-02-17](https://calv.info/agents-feb-2026))
- **Agent:** Claude Code (cli) ([source, 2026-02-17](https://calv.info/agents-feb-2026))
- **Model:** Fable 5 ([source, 2026-08-26](https://calv.info/small-models-have-arrived))
- **Model:** GPT-5.6 Sol ([source, 2026-08-26](https://calv.info/small-models-have-arrived))
- **Review:** Spot-checks the architecture; Cursor Bugbot and Codex review every PR ([source, 2026-02-17](https://calv.info/agents-feb-2026))
- **At once:** 3–4 overnight tasks ([source, 2026-02-17](https://calv.info/agents-feb-2026))
- **Harness:** Ghostty panes, a git worktree per numbered plan, a preview deploy per branch ([source, 2026-02-17](https://calv.info/agents-feb-2026))
- **Rules file:** Shared AGENTS.md / CLAUDE.md in a private 'claudefiles' repo ([source, 2026-02-17](https://calv.info/agents-feb-2026))
- **Skills:** commit, worktree, implement, implement-all, codex-review, address-bugs, pr-pass, focus ([source, 2026-02-17](https://calv.info/agents-feb-2026))

## In their words

> Opus is where I start, but Codex writes all my code.

> Claude Code is my regular driver for planning, orchestrating my terminal, and managing git/github operations.

> When doing coding work, I almost always reach for the most expensive and capable models (Fable 5, 5.6 Sol).

> When doing coding work, I almost always reach for the most expensive and capable models (Fable 5, 5.6 Sol).

> This is over-hyped on Twitter, but I do really try and kick off 3-4 tasks in Codex before going to bed, so they'll be ready for review in the morning.


Archetype (our label): Toolsmith. Newest source: 2026-08-26.
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