diff --git a/CLAUDE.md b/AGENTS.md
similarity index 97%
rename from CLAUDE.md
rename to AGENTS.md
index a4b1960..9e23001 100644
--- a/CLAUDE.md
+++ b/AGENTS.md
@@ -1,10 +1,10 @@
-# CLAUDE.md
+# AGENTS.md
 
 This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
 
 ## Commands
 
-This project uses `just` and `uv`. See `Justfile` for the source of truth.
+This project uses `just` and `uv`. See `justfile` for the source of truth.
 
 - `just install` — `uv lock --upgrade` then `uv sync --all-extras --frozen --group lint`
 - `just lint` — runs `eof-fixer`, `ruff format`, `ruff check --fix`, then `ty check` (writes)
diff --git a/docs/agents/domain.md b/docs/agents/domain.md
index cf02514..7b9b2bb 100644
--- a/docs/agents/domain.md
+++ b/docs/agents/domain.md
@@ -17,13 +17,13 @@ already has a home for each role. Use the repo's own files — do not create `CO
 | `docs/adr/` (durable decisions)    | `planning/decisions/<YYYY-MM-DD>-<slug>.md`     |
 | the *why* behind a shipped change  | `planning/changes/<YYYY-MM-DD>.NN-<slug>.md`    |
 
-`CLAUDE.md` carries the current public contract of `modern_di_pytest/factory.py` under its
+`AGENTS.md` carries the current public contract of `modern_di_pytest/factory.py` under its
 `## Architecture` heading. Read it before proposing anything about `modern_di_fixture` or
 `expose`; it is more specific than anything in `architecture/` today.
 
 ## Before exploring, read these
 
-- `CLAUDE.md` — `## Architecture` states the two public symbols and their contract.
+- `AGENTS.md` — `## Architecture` states the two public symbols and their contract.
 - `architecture/README.md`, then any `architecture/<capability>.md` touching your area.
   No capability files exist yet; the directory explains when to add the first.
 - `architecture/glossary.md` — the ubiquitous language.
diff --git a/Justfile b/justfile
similarity index 100%
rename from Justfile
rename to justfile