diff --git a/.gitignore b/.gitignore
index 95d8220538a..66eaddc6593 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,6 +41,17 @@ result
 /.code/*
 !/.code/.gitignore
 
+# Keep repo-level .codex config and skills visible, but ignore local runtime
+# leaves generated by agent sessions.
+/.codex/sessions/
+/.codex/history*.jsonl
+/.codex/log/
+/.codex/logs/
+/.codex/tmp/
+/.agents/runs/
+/.agents/tmp/
+/.agents/cache/
+
 # Antigravity stores local runtime/session state here.
 /.antigravitycli/
 
@@ -99,6 +110,9 @@ actions-runner/
 # caches
 .cache/
 __pycache__/
+.mypy_cache/
+.pytest_cache/
+.ruff_cache/
 .turbo/
 .parcel-cache/
 .eslintcache
@@ -144,6 +158,8 @@ coverage/
 
 # personal files
 personal/
+scratch/
+handoff*.md
 
 # os
 .DS_Store