# How Kieran Klaassen actually uses coding agents

Compound Engineering, Cora

**If you take one thing:** `/ce-compound`, turns each fix into a lesson. the step his whole method is named for, writing every solved problem down so the next agent starts smarter.

- **Agent:** Cursor ([source, undated](https://toolbox.every.to/kieranklaassen))
- **Agent:** Claude Code (cli) ([source, undated](https://toolbox.every.to/kieranklaassen))
- **Agent:** Codex ([source, undated](https://toolbox.every.to/kieranklaassen))
- **Model:** Claude Opus 5.5 ([source, 2026-09-22](https://every.to/vibe-check/vibe-check-opus-5-5-is-pulling-our-codex-converts-back-to-claude))
- **Model:** Claude Sonnet 5.5 ([source, 2026-09-28](https://x.com/kieranklaassen/status/2104633604169142756))
- **Review:** Parallel review agents, no line-by-line reading ([source, 2026-01-23](https://every.to/source-code/i-stopped-reading-code-my-code-reviews-got-better))
- **Harness:** Claude Code aliased to skip permissions, branches and git worktrees ([source, 2026-01-17](https://every.to/guides/compound-engineering))
- **Rules file:** AGENTS.md per repo, CLAUDE.md symlinked to it ([source, 2026-09-28](https://github.com/kieranklaassen/loadout/blob/c1b49eff6d9eb5e97ad776dbc186e61f0805a340/AGENTS.md#L3-L4))
- **Skills:** ce-babysit-pr, ce-bakeoff, ce-brainstorm, ce-code-review, ce-commit-push-pr, ce-commit, ce-compound-refresh, ce-compound, ce-debug, ce-doc-review, ce-dogfood, ce-explain, ce-handoff, ce-ideate, ce-noslop ([source, 2026-10-06](https://github.com/EveryInc/compound-engineering-plugin/tree/efcb657d9a5733ccc154c36cc7d3d78b4136eb23/skills))

## In their words

> Coding
Cursor
then Claude Code, Codex
Claude Opus 5.5

> Coding
Cursor
then Claude Code, Codex

> Coding
Cursor
then Claude Code, Codex

> Opus is replacing Fable 5.1 as my daily driver. For product work and writing code, I find it as good as Fable and sometimes better.

> Use Sonnet for iterative, quick work, especially design, prototyping, and product work. It's also nice for quick background jobs. Run it on low or medium effort.


Archetype (our label): Toolsmith. Newest source: 2026-10-06.
Card: https://www.prehistoriq.com/stacks/kieranklaassen/ · Data: https://github.com/prehistoriq/stacks/blob/main/data/stacks/kieranklaassen.json