diff --git a/.gitignore b/.gitignore
index 345e0c0..e6403d6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,6 +19,9 @@ rustc-ice-*.txt
 # Derived knowledge-graph artifacts generated by graphify
 graphify-out/
 
+# Serena MCP local tooling state (per-machine project config and cache)
+.serena/
+
 # RustRover
 #  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
 #  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore