diff --git a/.gitignore b/.gitignore
index d17209556c..6e5b8929f8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -165,3 +165,12 @@ src/.idea/
 
 # Ignore Jetbrains IntelliJ Workspace Directories
 .idea/
+
+# Agent instruction and session surfaces are intentionally local-only.
+AGENTS.md
+CLAUDE.md
+.agents/
+.claude/
+.codex/
+.agent-session
+.codex-session-*