diff --git a/.checkmake-config.ini b/.checkmake-config.ini
new file mode 100644
index 00000000..f2ac3c91
--- /dev/null
+++ b/.checkmake-config.ini
@@ -0,0 +1,2 @@
+[minphony]
+disabled = true
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 3e669854..170e2cfa 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -23,6 +23,22 @@ repos:
       - id: file-contents-sorter
         files: spelling_private_dict\.txt$
       - id: trailing-whitespace
+  - repo: https://github.com/pre-commit/pygrep-hooks
+    rev: v1.10.0
+    hooks:
+      - id: rst-directive-colons
+      - id: rst-inline-touching-normal
+      - id: text-unicode-replacement-char
+      - id: rst-backticks
+  - repo: https://github.com/mrtazz/checkmake.git
+    rev: 0.2.2
+    hooks:
+      - id: checkmake
+        args: ["--config", ".checkmake-config.ini"]
+  - repo: https://github.com/google/yamlfmt
+    rev: v0.13.0
+    hooks:
+      - id: yamlfmt
   - repo: local
     hooks:
       - id: actionlint
@@ -33,6 +49,13 @@ repos:
         types_or: [yaml]
         additional_dependencies: ["uv"]
 
+      - id: docformatter
+        name: docformatter
+        entry: uv run --extra=dev -m docformatter --in-place
+        language: python
+        types_or: [python]
+        additional_dependencies: ["uv"]
+
       - id: shellcheck
         name: shellcheck
         entry: uv run --extra=dev shellcheck --shell=bash --exclude=SC1017
@@ -215,6 +238,7 @@ ci:
     - ruff-check-fix-docs
     - ruff-format-fix
     - ruff-format-fix-docs
+    - docformatter
     - shellcheck
     - shellcheck-docs
     - shfmt
diff --git a/.yamlfmt b/.yamlfmt
new file mode 100644
index 00000000..fbb6dd43
--- /dev/null
+++ b/.yamlfmt
@@ -0,0 +1,5 @@
+formatter:
+    include_document_start: true
+    retain_line_breaks_single: true
+    trim_trailing_whitespace: true
+    end_of_file_newline: true
diff --git a/codecov.yaml b/codecov.yaml
index 93528e93..3be33a8e 100644
--- a/codecov.yaml
+++ b/codecov.yaml
@@ -1,3 +1,4 @@
+---
 coverage:
   status:
     patch:
diff --git a/pyproject.toml b/pyproject.toml
index 7d7fb27c..16cebe87 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,6 +46,7 @@ optional-dependencies.dev = [
     "deptry==0.20.0",
     "doc8==1.1.2",
     "doccmd==2024.10.8.12",
+    "docformatter==1.7.5",
     "interrogate==1.7.0",
     "mypy==1.11.2",
     "myst-parser==4.0.0",
@@ -232,6 +233,9 @@ spelling-private-dict-file = 'spelling_private_dict.txt'
 # --spelling-private-dict-file option instead of raising a message.
 spelling-store-unknown-words = 'no'
 
+[tool.docformatter]
+make-summary-multi-line = true
+
 [tool.check-manifest]
 
 ignore = [
diff --git a/sample/source/__init__.py b/sample/source/__init__.py
index 535ceb2e..b63eed5f 100644
--- a/sample/source/__init__.py
+++ b/sample/source/__init__.py
@@ -1 +1,3 @@
-"""Documentation."""
+"""
+Documentation.
+"""
diff --git a/src/sphinx_substitution_extensions/__init__.py b/src/sphinx_substitution_extensions/__init__.py
index cac48371..240b4865 100644
--- a/src/sphinx_substitution_extensions/__init__.py
+++ b/src/sphinx_substitution_extensions/__init__.py
@@ -74,7 +74,9 @@ def run(self) -> list[Node]:
 
 @beartype
 class SubstitutionCodeRole:
-    """Custom role for substitution code."""
+    """
+    Custom role for substitution code.
+    """
 
     options: ClassVar[dict[str, Any]] = {
         "class": directives.class_option,
@@ -115,7 +117,9 @@ def __call__(  # pylint: disable=dangerous-default-value
 
 @beartype
 class SubstitutionXRefRole(XRefRole):
-    """Custom role for XRefs."""
+    """
+    Custom role for XRefs.
+    """
 
     def process_link(
         self,
diff --git a/tests/conftest.py b/tests/conftest.py
index 797fcf50..831e6e04 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,4 +1,6 @@
-"""Configuration for pytest."""
+"""
+Configuration for pytest.
+"""
 
 import pytest
 from beartype import beartype
diff --git a/tests/test_substitution_extensions.py b/tests/test_substitution_extensions.py
index 38554aa8..0941e38c 100644
--- a/tests/test_substitution_extensions.py
+++ b/tests/test_substitution_extensions.py
@@ -197,8 +197,7 @@ def test_substitution_download(
 ) -> None:
     """
     The ``substitution-download`` role replaces the placeholders defined in
-    ``conf.py`` as specified in both the download text and the download
-    target.
+    ``conf.py`` as specified in both the download text and the download target.
     """
     source_directory = tmp_path / "source"
     source_directory.mkdir()