diff --git a/.gitignore b/.gitignore
index 7484b478b..5ef295e23 100644
--- a/.gitignore
+++ b/.gitignore
@@ -97,6 +97,16 @@ docs/qa/feature-checks/runs/**/TestResults/
 
 # Publish outputs
 publish/
+
+# Codex agent scratch scripts (not part of the codebase)
+.codex-*.mjs
+
+# Output dir (build/test/playwright scratch)
+output/
+
+# Stray duplicated source trees (accidental creation by tooling)
+src/src/
+src/Web.StellaOps.Web/
 publish-platform/
 .tmp-authority-publish/