diff --git a/src/skills/nix-style/RULE-FORMAT.md b/src/skills/RULE-FORMAT.md
similarity index 100%
rename from src/skills/nix-style/RULE-FORMAT.md
rename to src/skills/RULE-FORMAT.md
diff --git a/src/skills/nix-style/SKILL.md b/src/skills/nix-style/SKILL.md
index e943686..7951d4d 100644
--- a/src/skills/nix-style/SKILL.md
+++ b/src/skills/nix-style/SKILL.md
@@ -30,5 +30,5 @@ If the command fails, report the failure.
 
 ## Maintain rules
 
-When adding or changing files under [`rules/`](rules/), read [`RULE-FORMAT.md`](RULE-FORMAT.md) first.
+When adding or changing files under [`rules/`](rules/), read the shared rule format at `src/skills/RULE-FORMAT.md` first.
 Finish when the changed rule files follow that format.
diff --git a/src/skills/rust-style/RULE-FORMAT.md b/src/skills/rust-style/RULE-FORMAT.md
deleted file mode 100644
index 8abe570..0000000
--- a/src/skills/rust-style/RULE-FORMAT.md
+++ /dev/null
@@ -1,17 +0,0 @@
-# Rule format
-
-Use this structure for each rule:
-
-```md
-## Rule title
-
-### Rule
-
-State enforceable instructions.
-
-### Rationale
-
-Explain why the rule exists.
-```
-
-Add `### Examples` only when examples clarify the rule.
diff --git a/src/skills/rust-style/SKILL.md b/src/skills/rust-style/SKILL.md
index 694e787..440249a 100644
--- a/src/skills/rust-style/SKILL.md
+++ b/src/skills/rust-style/SKILL.md
@@ -30,5 +30,5 @@ If the command fails, report the failure.
 
 ## Maintain rules
 
-When adding or changing files under [`rules/`](rules/), read [`RULE-FORMAT.md`](RULE-FORMAT.md) first.
+When adding or changing files under [`rules/`](rules/), read the shared rule format at `src/skills/RULE-FORMAT.md` first.
 Finish when the changed rule files follow that format.