diff --git a/.gitignore b/.gitignore
index 035c4f4..6239aeb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,7 @@
 
 # K10 replay bundles are generated artifacts of a failing run.
 replays/
+
+# Python bytecode
+__pycache__/
+*.pyc
diff --git a/tools/__pycache__/cb-cost.cpython-312.pyc b/tools/__pycache__/cb-cost.cpython-312.pyc
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index 151a5e2..0000000
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diff --git a/tools/__pycache__/mutation-check.cpython-312.pyc b/tools/__pycache__/mutation-check.cpython-312.pyc
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diff --git a/tools/__pycache__/rule-coverage.cpython-312.pyc b/tools/__pycache__/rule-coverage.cpython-312.pyc
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