diff --git a/CLAUDE.md b/CLAUDE.md
index 58303ef..1ba9314 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -74,3 +74,6 @@ Transcript-based shell integration test runner. Rust.
 - Rust 2024 edition
 - No OOP — plain functions and structs/enums
 - Integration tests in `tests/shout.rs`, example `.shout` files in `tests/`
+- Never use `unsafe`
+- Keep dependencies to the bare minimum.
+- If you must use a dependency, use the lightest-weight version.