diff --git a/tools/lint b/tools/lint
index bc33f568bf..7fc70c83eb 100755
--- a/tools/lint
+++ b/tools/lint
@@ -51,6 +51,7 @@ def run() -> None:
                 "md",
                 "pp",
                 "py",
+                "pyi",
                 "rst",
                 "sh",
                 "text",
@@ -132,7 +133,7 @@ def run() -> None:
     linter_config.external_linter(
         "mypy",
         command,
-        ["py"],
+        ["py", "pyi"],
         pass_targets=False,
         description="Static type checker for Python (config: pyproject.toml)",
     )
@@ -158,7 +159,7 @@ def run() -> None:
     linter_config.external_linter(
         "isort",
         ["isort"],
-        ["py"],
+        ["py", "pyi"],
         description="Sorts Python import statements",
         check_arg=["--check-only", "--diff"],
     )
@@ -172,7 +173,7 @@ def run() -> None:
     linter_config.external_linter(
         "black",
         ["black"],
-        ["py"],
+        ["py", "pyi"],
         description="Reformats Python code",
         check_arg=["--check"],
         suppress_line=lambda line: line == "All done! ✨ 🍰 ✨\n"
@@ -229,8 +230,8 @@ def run() -> None:
         failed = check_pyflakes(by_lang["py"], args)
         return 1 if failed else 0
 
-    python_part1 = {x for x in by_lang["py"] if random.randint(0, 1) == 0}
-    python_part2 = {y for y in by_lang["py"] if y not in python_part1}
+    python_part1 = {x for x in by_lang["py"] + by_lang["pyi"] if random.randint(0, 1) == 0}
+    python_part2 = {y for y in by_lang["py"] + by_lang["pyi"] if y not in python_part1}
 
     @linter_config.lint
     def pep8_1of2() -> int: