diff --git a/.gitignore b/.gitignore
index b308310a..56f842e1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@ __pycache__/
 .pytest_cache/
 .mypy_cache/
 dist/
+dist-doc/
 build/
 **/tl/__init__.py
 **/tl/layer.py
diff --git a/DEVELOPING.md b/DEVELOPING.md
index b248bea0..5e7d7799 100644
--- a/DEVELOPING.md
+++ b/DEVELOPING.md
@@ -2,12 +2,19 @@ Code generation:
 
 ```sh
 pip install -e generator/
-python -m telethon_generator.codegen api.tl client/src/telethon/_impl/tl
-python -m telethon_generator.codegen mtproto.tl client/src/telethon/_impl/tl/mtproto
+python tools/codegen.py
 ```
 
 Formatting, type-checking and testing:
 
+```sh
+pip install isort black mypy pytest pytest-asyncio
+python tools/check.py
 ```
-./check.sh
+
+Documentation:
+
+```sh
+pip install sphinx_rtd_theme
+python tools/docgen.py
 ```
diff --git a/check.sh b/check.sh
deleted file mode 100644
index 180cf92c..00000000
--- a/check.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-isort . --profile black --gitignore
-black . --extend-exclude "tl/(abcs|functions|types)/\w+.py"
-mypy --strict .
-pytest . -m "not net"
diff --git a/tools/check.py b/tools/check.py
new file mode 100644
index 00000000..cef5d738
--- /dev/null
+++ b/tools/check.py
@@ -0,0 +1,22 @@
+"""
+Sort imports, format code, type-check and run offline tests.
+"""
+import subprocess
+import sys
+
+
+def run(*args: str) -> int:
+    return subprocess.run((sys.executable, "-m", *args)).returncode
+
+
+def main() -> None:
+    exit(
+        run("isort", ".", "--profile", "black", "--gitignore")
+        or run("black", ".", "--extend-exclude", r"tl/(abcs|functions|types)/\w+.py")
+        or run("mypy", "--strict", ".")
+        or run("pytest", ".", "-m", "not net")
+    )
+
+
+if __name__ == "__main__":
+    main()
diff --git a/tools/codegen.py b/tools/codegen.py
new file mode 100644
index 00000000..ebec85d9
--- /dev/null
+++ b/tools/codegen.py
@@ -0,0 +1,24 @@
+"""
+Run `telethon_generator.codegen` on both `api.tl` and `mtproto.tl` to output
+corresponding Python code in the default directories under the `client/`.
+"""
+import subprocess
+import sys
+
+GENERATOR = "telethon_generator.codegen"
+ROOT = "client/src/telethon/_impl"
+
+
+def run(*args: str) -> int:
+    return subprocess.run((sys.executable, "-m", *args)).returncode
+
+
+def main() -> None:
+    exit(
+        run(GENERATOR, "api.tl", f"{ROOT}/tl")
+        or run(GENERATOR, "mtproto.tl", f"{ROOT}/tl/mtproto")
+    )
+
+
+if __name__ == "__main__":
+    main()
diff --git a/tools/docgen.py b/tools/docgen.py
new file mode 100644
index 00000000..9a5960ea
--- /dev/null
+++ b/tools/docgen.py
@@ -0,0 +1,17 @@
+"""
+Run `sphinx-build` to create HTML documentation and detect errors.
+"""
+import subprocess
+import sys
+
+
+def run(*args: str) -> int:
+    return subprocess.run((sys.executable, "-m", *args)).returncode
+
+
+def main() -> None:
+    exit(run("sphinx", "-nW", "client/doc", "dist-doc"))
+
+
+if __name__ == "__main__":
+    main()