diff --git a/.github/workflows/pre-commit.yaml b/.github/workflows/pre-commit.yaml
new file mode 100644
index 00000000..30bfdd54
--- /dev/null
+++ b/.github/workflows/pre-commit.yaml
@@ -0,0 +1,26 @@
+name: Run pre-commit
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.13"
+
+      - name: Run prek
+        uses: j178/prek-action@v2
+        with:
+          extra_args: --all-files
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 73546dc1..b516f8b1 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -5,6 +5,8 @@ repos:
       - id: check-yaml
         args:
           - "--unsafe"
+        # These files are deliberately invalid YAML for testing error handling.
+        exclude: "^tests/config/dbAuth/badDbAuth.*\\.yaml$"
       - id: end-of-file-fixer
       - id: trailing-whitespace
       - id: check-toml
diff --git a/doc/lsst.utils/CHANGES.rst b/doc/lsst.utils/CHANGES.rst
index 9430614d..dc10294c 100644
--- a/doc/lsst.utils/CHANGES.rst
+++ b/doc/lsst.utils/CHANGES.rst
@@ -1,3 +1,12 @@
+lsst-utils v30.0.9 (2026-07-14)
+===============================
+
+New Features
+------------
+
+- Added ``DeprecatedDict`` mapping.
+  This can be used to configure a `dict` that issues deprecation warnings when certain keys are accessed.
+
 lsst-utils v30.0.0 (2026-01-15)
 ===============================
 
diff --git a/python/lsst/utils/argparsing.py b/python/lsst/utils/argparsing.py
index 48b62d85..c6cb99fa 100644
--- a/python/lsst/utils/argparsing.py
+++ b/python/lsst/utils/argparsing.py
@@ -30,6 +30,36 @@ class AppendDict(argparse.Action):
     does not contain exactly one "=" character is invalid. If the default value
     is non-empty, the default key-value pairs may be overwritten by values from
     the command line.
+
+    Parameters
+    ----------
+    option_strings : `str` | `list` [ `str` ]
+        The command-line option strings that trigger this action, e.g.
+        ``--config``.
+    dest : `str`
+        The name of the `~argparse.Namespace` attribute in which the
+        accumulated `dict` is stored.
+    nargs : `int` | `str` | `None`, optional
+        The number of command-line arguments consumed each time the option
+        appears, as accepted by `argparse.ArgumentParser.add_argument`.
+    const : `typing.Any` | `None`, optional
+        A constant value required by some ``nargs`` settings; unused by this
+        action.
+    default : `typing.Any` | `None`, optional
+        The initial value of the mapping if the option does not appear on the
+        command line. Must be a `~collections.abc.Mapping` or `None`; `None`
+        is converted to an empty `dict`.
+    type : `type` | `None`, optional
+        A callable applied by argparse to each command-line argument before
+        it is passed to this action.
+    choices : `typing.Any` | `None`, optional
+        A container of the allowable values for the argument.
+    required : `bool`, optional
+        Whether the option must appear on the command line.
+    help : `str` | `None`, optional
+        A brief description of the argument for usage messages.
+    metavar : `str` | `None`, optional
+        The name for the argument's value(s) in usage messages.
     """
 
     def __init__(
diff --git a/python/lsst/utils/plotting/publication_plots.py b/python/lsst/utils/plotting/publication_plots.py
index d3a10238..5cea91a3 100644
--- a/python/lsst/utils/plotting/publication_plots.py
+++ b/python/lsst/utils/plotting/publication_plots.py
@@ -34,9 +34,7 @@
 
 
 def set_rubin_plotstyle() -> None:
-    """
-    Set the matplotlib style for Rubin publications
-    """
+    """Set the matplotlib style for Rubin publications."""
     from matplotlib import style
 
     style.use("lsst.utils.plotting.rubin")
@@ -98,8 +96,13 @@ def mk_colormap(colorNames):  # type: ignore
 
 
 def divergent_cmap():  # type: ignore
-    """
-    Make a divergent color map.
+    """Make a divergent color map.
+
+    Returns
+    -------
+    cmap : `matplotlib.colors.LinearSegmentedColormap`
+        A colormap stepping from the standard stars color through
+        gray to the accent color.
     """
     cmap = mk_colormap([stars_color(), "#D9DCDE", accent_color()])
 
@@ -107,7 +110,19 @@ def divergent_cmap():  # type: ignore
 
 
 def stars_cmap(single_color=False):  # type: ignore
-    """Make a color map for stars."""
+    """Make a color map for stars.
+
+    Parameters
+    ----------
+    single_color : `bool`, optional
+        If `True` use the standard stars color.
+
+    Returns
+    -------
+    cmap : `matplotlib.colors.Colormap`
+        A colormap derived from the standard stars color if
+        ``single_color`` is `True`, otherwise the seaborn "mako" palette.
+    """
     import seaborn as sns
     from matplotlib.colors import ListedColormap
 
@@ -119,20 +134,35 @@ def stars_cmap(single_color=False):  # type: ignore
 
 
 def stars_color() -> str:
-    """Return the star color string for lines"""
+    """Return the star color string for lines."""
     return "#084d96"
 
 
 def accent_color() -> str:
-    """Return a contrasting color for overplotting,
-    black is the best for this but if you need two colors
+    """Return a contrasting color for overplotting.
+
+    Notes
+    -----
+    Black is the best for this but if you need two colors
     this works well on blue.
     """
     return "#DE8F05"
 
 
-def galaxies_cmap(single_color=False):  # type: ignore
-    """Make a color map for galaxies."""
+def galaxies_cmap(single_color: bool = False):  # type: ignore
+    """Make a color map for galaxies.
+
+    Parameters
+    ----------
+    single_color : `bool`, optional
+        If `True` use the standard galaxies color.
+
+    Returns
+    -------
+    cmap : `matplotlib.colors.LinearSegmentedColormap` or `str`
+        A colormap derived from the standard galaxies color if
+        ``single_color`` is `True`, otherwise the colormap name "inferno".
+    """
     if single_color:
         cmap = mk_colormap([galaxies_color()])
     else:
@@ -141,17 +171,29 @@ def galaxies_cmap(single_color=False):  # type: ignore
 
 
 def galaxies_color() -> str:
-    """Return the galaxy color string for lines"""
+    """Return the galaxy color string for lines."""
     return "#961A45"
 
 
 def sso_color() -> str:
-    """Return the SSO color string for lines"""
+    """Return the SSO color string for lines."""
     return "#01694c"
 
 
-def sso_cmap(single_color=False):  # type: ignore
-    """Make a color map for solar system objects."""
+def sso_cmap(single_color: bool = False):  # type: ignore
+    """Make a color map for solar system objects.
+
+    Parameters
+    ----------
+    single_color : `bool`, optional
+        If `True` use the standard SSO color.
+
+    Returns
+    -------
+    cmap : `matplotlib.colors.LinearSegmentedColormap` or `str`
+        A colormap derived from the standard SSO color if
+        ``single_color`` is `True`, otherwise the colormap name "viridis".
+    """
     if single_color:
         cmap = mk_colormap([sso_color()])
     else:
@@ -160,16 +202,19 @@ def sso_cmap(single_color=False):  # type: ignore
 
 
 def get_band_dicts() -> dict:
-    """
-    Define palettes, from RTN-045. This includes dicts for colors (bandpass
-    colors for white background), colors_black (bandpass colors for
-    black background), plot symbols, and line_styles, keyed on band (ugrizy).
+    """Define palettes, from RTN-045.
 
     Returns
     -------
     band_dict : `dict` of `dict`
         Dicts of colors, colors_black, symbols, and line_styles,
         keyed on bands 'u', 'g', 'r', 'i', 'z', and 'y'.
+
+    Notes
+    -----
+    This includes dicts for colors (bandpass colors for white background),
+    colors_black (bandpass colors for black background), plot symbols, and
+    line_styles, keyed on band (ugrizy).
     """
     colors = get_multiband_plot_colors()
     colors_black = get_multiband_plot_colors(dark_background=True)
diff --git a/tests/decorator_test/disable_timer.py b/tests/decorator_test/disable_timer.py
index 086b5cec..5b95f5c1 100644
--- a/tests/decorator_test/disable_timer.py
+++ b/tests/decorator_test/disable_timer.py
@@ -12,7 +12,13 @@
 
 @timeMethod(logger=log, logLevel=logging.INFO)
 def sleep_and_log(self, duration: float) -> None:
-    """Check that this does not log if the decorator was disabled on import."""
+    """Check that this does not log if the decorator was disabled on import.
+
+    Parameters
+    ----------
+    duration : `float`
+        Time to sleep.
+    """
     time.sleep(duration)
 
 
@@ -20,5 +26,10 @@ def sleep_and_log(self, duration: float) -> None:
 def sleep_and_nothing(self, duration: float) -> None:
     """Check that this does not have a `__wrapped__` attribute to confirm that
     the decorator is disabled.
+
+    Parameters
+    ----------
+    duration : `float`
+        Time to sleep.
     """
     time.sleep(duration)