Splitting rule files per package for Codex and Claude Code in a monorepo
10/19/2026 — 10/19, 23:19·1 sources (all)·1 reports (all)
Key takeaways
- For monorepos, the author suggests placing a rule file in every sub-package: AGENTS.md holds the real rules, while each directory's CLAUDE.m…
Background & analysis
On October 19, 2026, a DEV Community article described a practice for placing rule files in separate directories of a monorepo when working with Codex and Claude Code. The author recommends giving each sub-package its own rule file: AGENTS.md carries the actual rules, while the CLAUDE.md in each directory contains only a single import line that pulls it in. The stated reason is that Codex builds its instruction chain once at startup, working down from the project root, whereas Claude Code loads a directory's CLAUDE.md only when it reads a file in that subdirectory. The article gives an example: apps/web/AGENTS.md asks for Vitest and says to stay out of the generated API client, yet starting Codex at the repo root and asking it to fix a React component still led it to edit src/generated/client.ts, because that file never reached the prompt. The account ends with this recommendation; the material contains no further developments.
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Latest turnIn a monorepo, the author recommends giving every package its own rule file: AGENTS.md holds the actual rules, and each subfolder's CLAUDE.md is a single import line pointing to it. The reason is that Codex builds its instruction chain once per run from the repo root, while Claude Code loads a subfolder's CLAUDE.md later, when it touches a file there.
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In a monorepo, the author recommends giving every package its own rule file: AGENTS.md holds the actual rules, and each subfolder's CLAUDE.md is a single import line pointing to it. The reason is that Codex builds its instruction chain once per run from the repo root, while Claude Code loads a subfolder's CLAUDE.md later, when it touches a file there.
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