diff --git a/.rules b/.rules
new file mode 100644
index 0000000000000000000000000000000000000000..8aa3f565748b8182b5551d42a65e3311eabe7cd6
--- /dev/null
+++ b/.rules
@@ -0,0 +1,10 @@
+<!--
+SPDX-FileCopyrightText: Amolith <amolith@secluded.site>
+
+SPDX-License-Identifier: CC0-1.0
+-->
+
+- After completing requests, check the project diagnostics and resolve each
+  issue, one by one, according to your rules.
+- Only after you've resolved all diagnostics should you run `just` in the
+  terminal, if available, to perform further checks.