diff --git a/.claudeignore b/.claudeignore
new file mode 100644
index 0000000000..58cddf0b86
--- /dev/null
+++ b/.claudeignore
@@ -0,0 +1,18 @@
+# Ruby
+vendor/bundle/
+.bundle/
+tmp/
+log/
+coverage/
+*.gem
+.byebug_history
+
+# Secrets & environment
+.env
+.env.*
+!.env.example
+*.pem
+*.key
+*.p12
+*.pfx
+secrets/