diff --git a/.gitignore b/.gitignore
index 140394d..9430bd1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,12 @@ fuzz/artifacts/
 
 # Build artifacts
 /target
+
+# Agent / AI-tool artifacts — never commit (zero AI trace).
+.claude/
+.agents/
+.cursor/
+.aider*
+.continue/
+.playwright-mcp/
+**/*-mcp/