diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 00000000..75fca18e
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,23 @@
+"""Shared pytest configuration for Chronicle tests."""
+
+from __future__ import annotations
+
+import shutil
+
+import pytest
+
+
+@pytest.fixture
+def tmp_path(tmp_path):
+    """Remove everything a test wrote under ``tmp_path`` once it finishes.
+
+    Several tests build real source-package suites and merged bundles under
+    ``tmp_path``; the merged consumer bundle alone writes about 14 GB of nested
+    suites. pytest keeps the three newest ``pytest-N`` base directories and only
+    prunes older ones when no other pytest session holds a lock on them, so with
+    many sessions running concurrently the outputs accumulate for days. Deleting
+    the per-test directory here keeps the base temp directory bounded regardless
+    of how many sessions are active.
+    """
+    yield tmp_path
+    shutil.rmtree(tmp_path, ignore_errors=True)