diff --git a/.clippy.toml b/.clippy.toml
new file mode 100644
index 00000000..c5898979
--- /dev/null
+++ b/.clippy.toml
@@ -0,0 +1,4 @@
+avoid-breaking-exported-api = false
+allowed-idents-below-min-chars = [ "x", "y", "z", "r", "g", "b", "c", "s" ]
+absolute-paths-allowed-crates = [ "cstree" ]
+allowed-wildcard-imports      = [ "super", "Kind" ]
diff --git a/.rustfmt.toml b/.rustfmt.toml
new file mode 100644
index 00000000..3663d8db
--- /dev/null
+++ b/.rustfmt.toml
@@ -0,0 +1,5 @@
+edition = "2024"                   # Keep in sync with Cargo.toml.
+group_imports = "StdExternalCrate"
+doc_comment_code_block_width = 100
+condense_wildcard_suffixes = true
+imports_granularity = "Crate"