diff --git a/docs/source/autodoc/engineer.rst b/docs/source/autodoc/engineer.rst
index 7e5a6f0c..e09dc7d7 100644
--- a/docs/source/autodoc/engineer.rst
+++ b/docs/source/autodoc/engineer.rst
@@ -7,7 +7,21 @@
 ``bullet``
 ----------
 
-.. automodule:: royalnet.engineer.gunpowder
+.. automodule:: royalnet.engineer.bullet
+
+
+``contents``
+~~~~~~~~~~~~
+
+.. automodule:: royalnet.engineer.bullet.contents
+   :imported-members:
+
+
+``projectiles``
+~~~~~~~~~~~~~~~
+
+.. automodule:: royalnet.engineer.bullet.projectiles
+   :imported-members:
 
 
 ``command``
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 2db0a871..f53f6f9c 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -14,6 +14,7 @@
 # import sys
 # sys.path.insert(0, os.path.abspath('.'))
 
+import pkg_resources
 
 # -- Project information -----------------------------------------------------
 
@@ -23,7 +24,7 @@ copyright = '2020, Stefano Pigozzi'
 author = 'Stefano Pigozzi'
 
 # The full version, including alpha/beta/rc tags
-release = '6.0.0a12'
+release = pkg_resources.get_distribution("royalnet").version
 
 
 # -- General configuration ---------------------------------------------------
@@ -69,6 +70,7 @@ html_static_path = ['_static']
 intersphinx_mapping = {
     "python": ("https://docs.python.org/3.8", None),
     "sqlalchemy": ("https://docs.sqlalchemy.org/en/13/", None),
+    "async_property": ("https://async-property.readthedocs.io/en/latest/", None),
 }
 
 
diff --git a/royalnet/engineer/bullet/casing.py b/royalnet/engineer/bullet/casing.py
index ef5df540..03e14e54 100644
--- a/royalnet/engineer/bullet/casing.py
+++ b/royalnet/engineer/bullet/casing.py
@@ -1,20 +1,5 @@
 """
-Casings are parts of the data model that :mod:`royalnet.engineer` uses to build a common interface between
-different applications (implemented by individual *PDAs*).
-
-They exclusively use coroutine functions to access data, as it may be required to fetch it from a remote location before
-it is available.
-
-**All** coroutine functions can have three different results:
-
-- :exc:`.exc.CasingException` is raised, meaning that something went wrong during the data retrieval.
-  - :exc:`.exc.NotSupportedError` is raised, meaning that the frontend does not support the feature the requested data
-    is about (asking for :meth:`.Message.reply_to` in an IRC frontend, for example).
-- :data:`None` is returned, meaning that there is no data in that field (if a message is not a reply to anything,
-  :meth:`Message.reply_to` will be :data:`None`.
-- The data is returned.
-
-To instantiate a new :class:`Bullet` from a bullet, you should use the methods of :attr:`.Bullet.mag`.
+This module contains the base :class:`.Casing` class.
 """
 
 from __future__ import annotations
@@ -24,7 +9,23 @@ import abc
 
 class Casing(metaclass=abc.ABCMeta):
     """
-    The abstract base class for :mod:`~royalnet.engineer.casing` models.
+    :class:`.Casing`\\ s are parts of the data model that :mod:`royalnet.engineer` uses to build a common interface
+    between different applications (*PDA implementations*).
+
+    They use :func:`~async_property.async_property` to represent data, as it may be required to fetch it from a remote
+    location before it is available.
+
+    **All** their methods can have three different results:
+
+    - :exc:`.exc.CasingException` is raised, meaning that something went wrong during the data retrieval.
+      - :exc:`.exc.NotSupportedError` is raised, meaning that the frontend does not support the feature the requested
+        data is about (asking for :meth:`~royalnet.engineer.bullet.contents.message.Message.reply_to` in an SMS
+        implementation, for example).
+
+    - :data:`None` is returned, meaning that there is no data in that field (if a message is not a reply to anything,
+      :meth:`Message.reply_to` will be :data:`None`.
+
+    - The data is returned.
     """
 
     def __init__(self):
@@ -35,6 +36,6 @@ class Casing(metaclass=abc.ABCMeta):
     @abc.abstractmethod
     def __hash__(self) -> int:
         """
-        :return: A value that uniquely identifies the object in this Python interpreter process.
+        :return: A :class:`int` value that uniquely identifies the object in this Python interpreter process.
         """
         raise NotImplementedError()
diff --git a/royalnet/engineer/bullet/exc.py b/royalnet/engineer/bullet/exc.py
index e42cd59e..46b01f76 100644
--- a/royalnet/engineer/bullet/exc.py
+++ b/royalnet/engineer/bullet/exc.py
@@ -1,5 +1,5 @@
 """
-The exceptions which can happen in bullets.
+This modules contains the exceptions which can happen in bullets.
 """
 
 from .. import exc
@@ -19,11 +19,11 @@ class FrontendError(BulletException):
 
 class NotSupportedError(FrontendError, NotImplementedError):
     """
-    The requested property isn't available on the current frontend.
+    The requested property isn't available on the current implementation.
     """
 
 
 class ForbiddenError(FrontendError):
     """
-    The bot user does not have sufficient permissions to perform a frontend operation.
+    The bot does not have sufficient permissions to perform an operation.
     """
diff --git a/royalnet/engineer/bullet/projectiles/_base.py b/royalnet/engineer/bullet/projectiles/_base.py
index 6b0cdfd9..9aecbd38 100644
--- a/royalnet/engineer/bullet/projectiles/_base.py
+++ b/royalnet/engineer/bullet/projectiles/_base.py
@@ -1,3 +1,7 @@
+"""
+This module contains the base :class:`.Projectile` class.
+"""
+
 from __future__ import annotations
 
 import abc
diff --git a/royalnet/engineer/bullet/projectiles/message.py b/royalnet/engineer/bullet/projectiles/message.py
index 10887148..75140ec6 100644
--- a/royalnet/engineer/bullet/projectiles/message.py
+++ b/royalnet/engineer/bullet/projectiles/message.py
@@ -1,3 +1,8 @@
+"""
+This module contains the projectiles related to messages: :class:`.MessageReceived`, :class:`MessageEdited` and
+:class:`MessageDeleted`.
+"""
+
 from __future__ import annotations
 from ._imports import *
 
diff --git a/royalnet/engineer/bullet/projectiles/reaction.py b/royalnet/engineer/bullet/projectiles/reaction.py
index 340ed8a2..2fc28974 100644
--- a/royalnet/engineer/bullet/projectiles/reaction.py
+++ b/royalnet/engineer/bullet/projectiles/reaction.py
@@ -1,3 +1,7 @@
+"""
+This module contains the :class:`.Reaction` projectile.
+"""
+
 from __future__ import annotations
 from ._imports import *
 
diff --git a/royalnet/engineer/bullet/projectiles/user.py b/royalnet/engineer/bullet/projectiles/user.py
index e7cb1922..22a3d583 100644
--- a/royalnet/engineer/bullet/projectiles/user.py
+++ b/royalnet/engineer/bullet/projectiles/user.py
@@ -1,3 +1,8 @@
+"""
+This module contains the projectiles related to user actions, such as :class:`.UserJoined`, :class:`.UserLeft` and
+:class:`.UserUpdate`.
+"""
+
 from __future__ import annotations
 from ._imports import *
 
diff --git a/royalnet/engineer/command.py b/royalnet/engineer/command.py
index 0f8e5afa..02aeedd5 100644
--- a/royalnet/engineer/command.py
+++ b/royalnet/engineer/command.py
@@ -1,90 +1,129 @@
-# Module docstring
+"""
+This module contains the :class:`.FullCommand` and :class:`.PartialCommand` classes, and all
+:class:`.CommandException`\\ s.
 """
 
-"""
-
-# Special imports
 from __future__ import annotations
 import royalnet.royaltyping as t
 
-# External imports
 import logging
 import re
 
-# Internal imports
 from . import conversation as c
 from . import sentry as s
 from . import bullet as b
 from . import teleporter as tp
+from . import exc
 
-# Special global objects
 log = logging.getLogger(__name__)
 
 
-# Code
-class Command(c.Conversation):
+class CommandException(exc.EngineerException):
     """
-    A Command is a :class:`~.conversation.Conversation` which is started by a :class:`~.bullet.Message` having a text
-    matching the :attr:`.pattern`; the named capture groups of the pattern are then passed as keyword arguments to
-    :attr:`.f`.
-
-    .. info:: Usually you don't directly instantiate commands, you define :class:`.PartialCommand`\\ s in packs which
-              are later completed by a runner.
+    The base :class:`Exception` of the :mod:`royalnet.engineer.command`\\ module.
     """
 
-    def __init__(self, f: c.ConversationProtocol, *, names: t.List[str] = None, pattern: re.Pattern, lock: bool = True):
+
+class CommandNameException(CommandException):
+    """
+    An :class:`Exception` raised because the :attr:`.FullCommand.names` were invalid.
+    """
+
+
+class MissingNameError(ValueError, CommandNameException):
+    """
+    :class:`.FullCommand`\\ s must have at least one name, but no names were passed.
+    """
+
+
+class NotAlphanumericNameError(ValueError, CommandNameException):
+    """
+    All :attr:`.FullCommand.names` should be alphanumeric (a-z 0-9).
+
+    .. seealso:: :meth:`str.isalnum`
+    """
+
+
+class FullCommand(c.Conversation):
+    """
+    A :class:`.FullCommand` is a :class:`~royalnet.engineer.conversation.Conversation` which is started by a
+    :class:`~royalnet.engineer.projectiles.Projectile` having a text matching the :attr:`.pattern`;
+    the named capture groups of the pattern are then passed as teleported keyword arguments to :attr:`.f`.
+
+    .. note:: If you're creating a command pack, you shouldn't instantiate directly :class:`.FullCommand` objects, but
+              you should use :class:`.PartialCommand`\\ s instead.
+    """
+
+    def __init__(self, f: c.ConversationProtocol, *, names: t.List[str], pattern: re.Pattern, lock: bool = True):
         """
-        Create a new :class:`.Command` .
+        Instantiate a new :class:`.FullCommand`\\ .
         """
-        log.debug(f"Teleporting function: {f!r}")
+
+        self.plain_f = f
+        """
+        A reference to the unteleported function :attr:`.f`\\ .
+        """
+
         teleported = tp.Teleporter(f, validate_input=True, validate_output=False)
-
-        log.debug(f"Initializing Conversation with: {teleported!r}")
         super().__init__(teleported)
 
-        self.names: t.List[str] = names if names else []
+        if len(names) < 1:
+            raise MissingNameError(f"Passed 'names' list is empty", names)
+
+        self.names: t.List[str] = names
         """
         The names of the command, as a :class:`list` of :class:`str`.
         
-        The first element of the list is the "main" name, and will be displayed in help messages.
+        The first element of the list is the primary :attr:`.name`, and will be displayed in help messages.
         """
 
         self.pattern: re.Pattern = pattern
         """
-        The pattern that should be matched by the command.
+        The pattern that should be matched by the text of the first 
+        :class:`~royalnet.engineer.bullet.projectiles.message.MessageReceived` by the 
+        :class:`~royalnet.engineer.conversation.Conversation`\\ .
         """
 
         self.lock: bool = lock
         """
-        If calling this command should :meth:`~royalnet.engineer.dispenser.Dispenser.lock` the dispenser.
+        If calling this command should :meth:`~royalnet.engineer.dispenser.Dispenser.lock` the calling dispenser.
+        
+        Locked dispensers cannot run any other :class:`~royalnet.engineer.conversation.Conversation`\\ s but the one 
+        which locked it.
         """
 
     def name(self):
         """
-        :return: The main name of the Command.
+        :return: The primary name of the :class:`.FullCommand`.
         """
         return self.names[0]
 
     def aliases(self):
         """
-        :return: The aliases (non-main names) of the Command.
+        :return: The secondary names of the :class:`.FullCommand`.
         """
         return self.names[1:]
 
     def __repr__(self):
-        if (nc := len(self.names)) > 1:
-            plus = f" + {nc-1} other names"
-        else:
-            plus = ""
+        plus = f" + {nc-1} other names" if (nc := len(self.names)) > 1 else ""
         return f"<{self.__class__.__qualname__}: {self.name()!r}{plus}>"
 
     async def run(self, *, _sentry: s.Sentry, **base_kwargs) -> t.Optional[c.ConversationProtocol]:
+        """
+        Run the command as if it was a conversation.
+
+        :param _sentry: The :class:`~royalnet.engineer.sentry.Sentry` to use for the conversation.
+        :param base_kwargs: Keyword arguments to pass to the wrapped function :attr:`.f` .
+        :return: The result of the wrapped function :attr:`.f` , or :data:`None` if the first projectile received does
+                 not satisfy the requirements of the command.
+        """
+
         log.debug(f"Awaiting a bullet...")
         projectile: b.Projectile = await _sentry
 
         log.debug(f"Received: {projectile!r}")
 
-        log.debug(f"Ensuring a message was received: {projectile!r}")
+        log.debug(f"Ensuring the projectile is a MessageReceived: {projectile!r}")
         if not isinstance(projectile, b.MessageReceived):
             log.debug(f"Returning: {projectile!r} is not a message")
             return
@@ -112,7 +151,7 @@ class Command(c.Conversation):
 
             with _sentry.dispenser().lock(self):
                 log.debug(f"Passing args to function: {message_kwargs!r}")
-                return await super().run(
+                return await super().__call__(
                     _sentry=_sentry,
                     _proj=projectile,
                     _msg=msg,
@@ -123,7 +162,7 @@ class Command(c.Conversation):
 
         else:
             log.debug(f"Passing args to function: {message_kwargs!r}")
-            return await super().run(
+            return await super().__call__(
                 _sentry=_sentry,
                 _proj=projectile,
                 _msg=msg,
@@ -143,21 +182,28 @@ class Command(c.Conversation):
 
 class PartialCommand:
     """
-    A PartialCommand is a :class:`.Command` having an unknown :attr:`~.Command.name` and :attr:`~.Command.pattern` at
-    the moment of creation.
+    :class:`.PartialCommand` is a class meant for **building command packs**.
 
-    They can specified later using :meth:`.complete`.
+    It provides mostly the same interface as a :class:`.FullCommand`, but some fields are unknown until the command is
+    registered in a PDA.
+
+    The missing fields currently are:
+    - :attr:`~.FullCommand.name`
+    - :attr:`~.FullCommand.pattern`
+
+    At the moment of registration in a PDA, :meth:`.complete` is called, converting it in a :class:`.FullCommand`.
     """
+
     def __init__(self, f: c.ConversationProtocol, syntax: str, lock: bool = True):
         """
-        Create a new :class:`.PartialCommand` .
+        Instantiate a new :class:`.PartialCommand`\\ .
 
-        .. seealso:: :meth:`.new`
+        .. seealso:: The corresponding decorator form, :meth:`.new`.
         """
 
         self.f: c.ConversationProtocol = f
         """
-        The function to pass to :attr:`.c.Conversation.f`.
+        The function to pass to be called when the command is executed.
         """
 
         self.syntax: str = syntax
@@ -173,11 +219,20 @@ class PartialCommand:
     @classmethod
     def new(cls, *args, **kwargs):
         """
-        A decorator that instantiates a new :class:`Conversation` object using the decorated function.
+        Decorator factory for creating new :class:`.PartialCommand` with the decorator syntax::
 
-        :return: The created :class:`Conversation` object.
-                 It can still be called in the same way as the previous function!
+            >>> import royalnet.engineer as engi
+
+            >>> @PartialCommand.new(syntax="")
+            ... async def ping(*, _sentry: engi.Sentry, _msg: engi.Message, **__):
+            ...     await _msg.reply(text="🏓 Pong!")
+
+            >>> ping
+                <PartialCommand <function ping at ...>>
+
+        :return: The decorator to wrap around the :attr:`.f` function.
         """
+
         def decorator(f: c.ConversationProtocol):
             partial_command = cls(f=f, *args, **kwargs)
             log.debug(f"Created: {partial_command!r}")
@@ -185,36 +240,42 @@ class PartialCommand:
 
         return decorator
 
-    def complete(self, *, names: t.List[str] = None, pattern: str) -> Command:
+    def complete(self, *, names: t.List[str], pattern: str) -> FullCommand:
         """
-        Complete the :class:`.PartialCommand` with names and a pattern, creating a :class:`Command` object.
+        Complete the :class:`.PartialCommand` with the missing fields, creating a :class:`.FullCommand` object.
 
-        :param names: The names of the command. See :attr:`.Command.names` .
-        :param pattern: The pattern to add to the PartialCommand. It is first :meth:`~str.format`\\ ted with the keyword
-                        arguments ``name`` and ``syntax`` and later :func:`~re.compile`\\ d with the
-                        :data:`re.IGNORECASE` flag.
-        :return: The complete :class:`Command`.
+        :param names: The :attr:`~.FullCommand.names` that the :class:`.FullCommand` should have.
+        :param pattern: The pattern to add to the :class:`.PartialCommand`\\ .
+                        It is first :meth:`~str.format`\\ ted with the keyword arguments ``name`` and ``syntax``
+                        and later :func:`~re.compile`\\ d with the :data:`re.IGNORECASE` flag.
+
+        :return: The completed :class:`.FullCommand`.
+
+        :raises .MissingNameError: If no :attr:`.FullCommand.names` are specified.
         """
-        if names is None:
-            names = []
+
         if len(names) < 1:
-            raise ValueError("Commands must have at least one name.")
+            raise MissingNameError(f"Passed 'names' list is empty", names)
         for name in names:
             if not name.isalnum():
-                raise ValueError(f"Name is not alphanumeric: {name!r}")
+                raise NotAlphanumericNameError(f"Name is not alphanumeric", name)
 
+        log.debug(f"")
         name_regex = f"(?:{'|'.join(names)})"
         log.debug(f"Completed pattern: {name_regex!r}")
 
         pattern: re.Pattern = re.compile(pattern.format(name=name_regex, syntax=self.syntax), re.IGNORECASE)
-        return Command(f=self.f, names=names, pattern=pattern, lock=self.lock)
+        return FullCommand(f=self.f, names=names, pattern=pattern, lock=self.lock)
 
     def __repr__(self):
         return f"<{self.__class__.__qualname__} {self.f!r}>"
 
 
-# Objects exported by this module
 __all__ = (
-    "Command",
+    "CommandException",
+    "CommandNameException",
+    "FullCommand",
+    "MissingNameError",
+    "NotAlphanumericNameError",
     "PartialCommand",
 )
diff --git a/royalnet/engineer/conversation.py b/royalnet/engineer/conversation.py
index b67b360f..dbd72f03 100644
--- a/royalnet/engineer/conversation.py
+++ b/royalnet/engineer/conversation.py
@@ -1,28 +1,21 @@
-# Module docstring
 """
-Conversations are wrapper classes that can be applied to functions which await
-:class:`~royalnet.engineer.bullet.Bullet`\\ s from a :class:`~royalnet.engineer.sentry.Sentry`.
+This module contains :class:`.ConversationProtocol`, the typing stub for conversation functions, and
+:class:`.Conversation`, a decorator for functions which should help in debugging conversations.
 """
 
-# Special imports
 from __future__ import annotations
 import royalnet.royaltyping as t
 
-# External imports
 import logging
 
-# Internal imports
 from . import sentry as s
 
-
-# Special global objects
 log = logging.getLogger(__name__)
 
 
-# Code
 class ConversationProtocol(t.Protocol):
     """
-    Typing annotation for Conversation functions.
+    Typing stub for :class:`.Conversation`\\ -compatible functions.
     """
     def __call__(self, *, _sentry: s.Sentry, **kwargs) -> t.Awaitable[t.Optional[ConversationProtocol]]:
         ...
@@ -30,15 +23,20 @@ class ConversationProtocol(t.Protocol):
 
 class Conversation:
     """
-    The base class for Conversations. It does nothing on its own except providing better debug information.
+    :class:`.Conversation`\\ s are functions which await
+    :class:`~royalnet.engineer.bullet.projectiles._base.Projectile`\\ s incoming from a
+    :class:`~royalnet.engineer.sentry.Sentry` .
+
+    This class is callable ( :meth:`.__call__` ), and can be used in place of plain functions to have better debug
+    information.
     """
 
     def __init__(self, f: ConversationProtocol, *_, **__):
         self.f: ConversationProtocol = f
         """
-        The function that was wrapped by this conversation.
+        The function that is wrapped by this class.
          
-        It can be called by calling this object as it was a function::
+        It can be called by calling this object as if it was a function::
         
             my_conv(_sentry=_sentry, _msg=msg)
         """
@@ -46,7 +44,14 @@ class Conversation:
     @classmethod
     def new(cls, *args, **kwargs):
         """
-        A decorator that instantiates a new :class:`Conversation` object using the decorated function.
+        Decorator factory for creating new :class:`.PartialCommand` with the decorator syntax::
+
+            >>> @Conversation.new()
+            ... def my_conv(*, _sentry: s.Sentry, **__):
+            ...     pass
+
+            >>> my_conv
+                <Conversation #1234>
 
         :return: The created :class:`Conversation` object.
                  It can still be called in the same way as the previous function!
@@ -59,16 +64,7 @@ class Conversation:
 
     def __call__(self, *, _sentry: s.Sentry, **kwargs) -> t.Awaitable[t.Optional[ConversationProtocol]]:
         log.debug(f"Calling: {self!r}")
-        return self.run(_sentry=_sentry, **kwargs)
-
-    async def run(self, *, _sentry: s.Sentry, **kwargs) -> t.Optional[ConversationProtocol]:
-        """
-        The coroutine function that generates the coroutines returned by :meth:`.__call__` .
-
-        It is a :class:`Conversation` itself.
-        """
-        log.debug(f"Running: {self!r}")
-        return await self.f(_sentry=_sentry, **kwargs)
+        return self.f(_sentry=_sentry, **kwargs)
 
     def __repr__(self):
         return f"<{self.__class__.__qualname__} #{id(self)}>"
diff --git a/royalnet/engineer/discard.py b/royalnet/engineer/discard.py
index 708ad184..a66ef5af 100644
--- a/royalnet/engineer/discard.py
+++ b/royalnet/engineer/discard.py
@@ -1,3 +1,8 @@
+"""
+This module contains the :class:`.Discard` special exception.
+"""
+
+
 class Discard(BaseException):
     """
     A special exception which should be raised by :class:`~royalnet.engineer.wrench.Wrench`\\ es if a certain object
diff --git a/royalnet/engineer/dispenser.py b/royalnet/engineer/dispenser.py
index 8262692e..94150598 100644
--- a/royalnet/engineer/dispenser.py
+++ b/royalnet/engineer/dispenser.py
@@ -1,5 +1,5 @@
 """
-Dispensers instantiate sentries and dispatch events in bulk to the whole group.
+This module contains the :class:`.Dispenser` class.
 """
 
 from __future__ import annotations
@@ -10,13 +10,36 @@ import contextlib
 
 from .sentry import SentrySource
 from .conversation import Conversation
-from .exc import LockedDispenserError
+from .exc import EngineerException
 from .bullet.projectiles import Projectile
 
 log = logging.getLogger(__name__)
 
 
+class DispenserException(EngineerException):
+    """
+    The base class for errors in :mod:`royalnet.engineer.dispenser`\\ .
+    """
+
+
+class LockedDispenserError(DispenserException):
+    """
+    The :class:`.Dispenser` couldn't start a new :class:`~royalnet.engineer.conversation.Conversation` as it is
+    currently :attr:`.Dispenser.lock`\\ ed.
+    """
+    def __init__(self, locked_by, *args):
+        super().__init__(*args)
+        self.locked_by = locked_by
+
+
 class Dispenser:
+    """
+    A :class:`.Dispenser` is an object which instantiates multiple :class:`~royalnet.engineer.sentry.Sentry` and
+    multiplexes and distributes incoming :class:`~royalnet.engineer.bullet.projectiles._base.Projectile`\\ s to them.
+
+    They usually represent a single "conversation channel" with the bot: either a chat channel, or an user.
+    """
+
     def __init__(self):
         self.sentries: t.List[SentrySource] = []
         """
@@ -32,47 +55,48 @@ class Dispenser:
 
     async def put(self, item: Projectile) -> None:
         """
-        Insert a new projectile in the queues of all the running sentries.
+        Insert a new :class:`~royalnet.engineer.bullet.projectiles._base.Projectile` in the queues of all the
+        running :attr:`.sentries`.
 
-        :param item: The projectile to insert.
+        :param item: The :class:`~royalnet.engineer.bullet.projectiles._base.Projectile` to insert.
         """
-        log.debug(f"Putting {item}...")
+        log.debug(f"Putting {item!r}...")
         for sentry in self.sentries:
             await sentry.put(item)
 
     @contextlib.contextmanager
     def sentry(self, *args, **kwargs):
         """
-        A context manager which creates a :class:`.SentrySource` and keeps it in :attr:`.sentries` while it is being
-        used.
+        A :func:`~contextlib.contextmanager` which creates a :class:`.SentrySource` and keeps it in :attr:`.sentries`
+        while it is being used.
         """
         log.debug("Creating a new SentrySource...")
         sentry = SentrySource(dispenser=self, *args, **kwargs)
 
-        log.debug(f"Adding: {sentry}")
+        log.debug(f"Adding: {sentry!r}")
         self.sentries.append(sentry)
 
-        log.debug(f"Yielding: {sentry}")
+        log.debug(f"Yielding: {sentry!r}")
         yield sentry
 
-        log.debug(f"Removing from the sentries list: {sentry}")
+        log.debug(f"Removing from the sentries list: {sentry!r}")
         self.sentries.remove(sentry)
 
     async def run(self, conv: Conversation, **kwargs) -> None:
         """
-        Run the passed conversation.
+        Run a :class:`~royalnet.engineer.conversation.Conversation`\\ .
 
-        :param conv: The conversation to run.
+        :param conv: The :class:`~royalnet.engineer.conversation.Conversation` to run.
         :raises .LockedDispenserError: If the dispenser is currently :attr:`.locked_by` a :class:`.Conversation`.
         """
         log.debug(f"Trying to run: {conv!r}")
 
         if self._locked_by:
             log.debug(f"Dispenser is locked by {self._locked_by!r}, refusing to run {conv!r}")
-            raise LockedDispenserError(self._locked_by, f"The Dispenser is currently locked by {self._locked_by!r} and "
-                                                        f"cannot start new conversations.")
+            raise LockedDispenserError(
+                f"The Dispenser is currently locked and cannot start any new Conversation.", self._locked_by)
 
-        log.debug(f"Running: {conv}")
+        log.debug(f"Running: {conv!r}")
         with self.sentry() as sentry:
             state = conv(_sentry=sentry, **kwargs)
 
@@ -83,10 +107,10 @@ class Dispenser:
     @contextlib.contextmanager
     def lock(self, conv: Conversation):
         """
-        Lock the dispenser while this :func:`~contextlib.contextmanager` is in scope.
+        Lock the :class:`.Dispenser` while this :func:`~contextlib.contextmanager` is in scope.
 
-        A locked dispenser will refuse to :meth:`.run` any new conversations, raising :exc:`.exc.LockedDispenserError`
-        instead.
+        A locked :class:`.Dispenser` will refuse to :meth:`.run` any new conversations,
+        raising :exc:`.LockedDispenserError` instead.
 
         :param conv: The conversation that requested the lock.
 
@@ -104,4 +128,6 @@ class Dispenser:
 
 __all__ = (
     "Dispenser",
+    "DispenserException",
+    "LockedDispenserError",
 )
diff --git a/royalnet/engineer/exc.py b/royalnet/engineer/exc.py
index 6add7fb1..b3220629 100644
--- a/royalnet/engineer/exc.py
+++ b/royalnet/engineer/exc.py
@@ -1,4 +1,6 @@
-import pydantic
+"""
+This module contains the base :class:`.EngineerException` .
+"""
 
 
 class EngineerException(Exception):
@@ -7,58 +9,6 @@ class EngineerException(Exception):
     """
 
 
-class WrenchException(EngineerException):
-    """
-    The base class for errors in :mod:`royalnet.engineer.wrench`.
-    """
-
-
-class DeliberateException(WrenchException):
-    """
-    This exception was deliberately raised by :class:`royalnet.engineer.wrench.ErrorAll`.
-    """
-
-
-class TeleporterError(EngineerException, pydantic.ValidationError):
-    """
-    The base class for errors in :mod:`royalnet.engineer.teleporter`.
-    """
-
-
-class InTeleporterError(TeleporterError):
-    """
-    The input parameters validation failed.
-    """
-
-
-class OutTeleporterError(TeleporterError):
-    """
-    The return value validation failed.
-    """
-
-
-class DispenserException(EngineerException):
-    """
-    The base class for errors in :mod:`royalnet.engineer.dispenser`.
-    """
-
-
-class LockedDispenserError(DispenserException):
-    """
-    The dispenser couldn't start a new conversation as it is currently locked.
-    """
-    def __init__(self, locked_by, *args):
-        super().__init__(*args)
-        self.locked_by = locked_by
-
-
 __all__ = (
     "EngineerException",
-    "WrenchException",
-    "DeliberateException",
-    "TeleporterError",
-    "InTeleporterError",
-    "OutTeleporterError",
-    "DispenserException",
-    "LockedDispenserError",
 )
diff --git a/royalnet/engineer/sentry.py b/royalnet/engineer/sentry.py
index 9d2e90c4..4f4a9349 100644
--- a/royalnet/engineer/sentry.py
+++ b/royalnet/engineer/sentry.py
@@ -1,5 +1,6 @@
 """
-Sentries are asynchronous receivers for events (usually :class:`bullet.Projectile`) incoming from Dispensers.
+This module contains the :class:`.Sentry` class and its descendents :class:`SentryFilter` and :class:`SentrySource`\\ .
+
 
 They support event filtering through Wrenches and coroutine functions.
 """
@@ -22,7 +23,13 @@ log = logging.getLogger(__name__)
 
 class Sentry(metaclass=abc.ABCMeta):
     """
-    The abstract object representing a node of the pipeline.
+    A :class:`.Sentry` is an asynchronous receiver for :class:`~royalnet.engineer.bullet.projectiles._base.Projectile`
+    incoming from :class:`~royalnet.engineer.dispenser.Dispenser`\\ s.
+
+    Sentries can be chained together to form a filtering pipeline, starting with a :class:`.SentrySource` followed by
+    zero or more :class:`.SentryFilter`\\ s.
+
+    This abstract base class represents a single node of the pipeline.
     """
 
     @abc.abstractmethod
@@ -32,11 +39,14 @@ class Sentry(metaclass=abc.ABCMeta):
     @abc.abstractmethod
     def get_nowait(self):
         """
-        Try to get a single :class:`~.bullet.Projectile` from the pipeline, without blocking or handling discards.
+        Try to get a single :class:`~royalnet.engineer.bullet.projectiles._base.Projectile` from the pipeline,
+        **without blocking** or **handling :class:`~royalnet.engineer.discard.Discard`\\ s** .
+
+        :return: The **returned** :class:`~royalnet.engineer.bullet.projectiles._base.Projectile`.
 
-        :return: The **returned** :class:`~.bullet.Projectile`.
         :raises asyncio.QueueEmpty: If the queue is empty.
-        :raises .discard.Discard: If the object was **discarded** by the pipeline.
+        :raises .discard.Discard: If the object was **:class:`~royalnet.engineer.discard.Discard`\\ ed** by
+                                  the pipeline.
         :raises Exception: If an exception was **raised** in the pipeline.
         """
         raise NotImplementedError()
@@ -44,10 +54,12 @@ class Sentry(metaclass=abc.ABCMeta):
     @abc.abstractmethod
     async def get(self):
         """
-        Try to get a single :class:`~.bullet.Projectile` from the pipeline, blocking until something is available, but
-        without handling discards.
+        Try to get a single :class:`~royalnet.engineer.bullet.projectiles._base.Projectile` from the pipeline,
+        **blocking** until something is available, but
+        **without handling :class:`~royalnet.engineer.discard.Discard`\\ s**.
+
+        :return: The **returned** :class:`~royalnet.engineer.bullet.projectiles._base.Projectile`.
 
-        :return: The **returned** :class:`~.bullet.Projectile`.
         :raises .discard.Discard: If the object was **discarded** by the pipeline.
         :raises Exception: If an exception was **raised** in the pipeline.
         """
@@ -55,10 +67,11 @@ class Sentry(metaclass=abc.ABCMeta):
 
     async def wait(self):
         """
-        Try to get a single :class:`~.bullet.Projectile` from the pipeline, blocking until something is available and is
-         not discarded.
+        Try to get a single :class:`~.bullet.Projectile` from the pipeline, **blocking** until something is available
+        and is **not discarded**.
 
         :return: The **returned** :class:`~.bullet.Projectile`.
+
         :raises Exception: If an exception was **raised** in the pipeline.
         """
         while True:
@@ -72,7 +85,7 @@ class Sentry(metaclass=abc.ABCMeta):
 
     def __await__(self):
         """
-        Awaiting an object implementing :class:`.SentryInterface` corresponds to awaiting :meth:`.wait`.
+        Awaiting an object implementing :class:`.Sentry` corresponds to awaiting :meth:`.wait`.
         """
         return self.get().__await__()
 
@@ -89,9 +102,11 @@ class Sentry(metaclass=abc.ABCMeta):
         """
         Chain a new filter to the pipeline.
 
-        :param wrench: The filter to add to the chain. It can either be a :class:`.wrench.Wrench`, or a coroutine
-                       function accepting a single object as parameter and returning the same or a different one.
-        :return: A new :class:`.SentryFilter` which includes the filter.
+        :param wrench: The filter to add to the chain. It can either be a :class:`~royalnet.engineer.wrench.Wrench`,
+                       or a coroutine function accepting a single object as parameter and returning another one.
+        :return: The resulting :class:`.SentryFilter`\\ .
+        :raises TypeError: If the right side operator is neither a :class:`~royalnet.engineer.wrench.Wrench` or a
+                           coroutine function.
 
         .. seealso:: :meth:`.__or__`
         """
@@ -106,8 +121,11 @@ class Sentry(metaclass=abc.ABCMeta):
 
         .. code-block::
 
-           await (sentry | wrench.Type(Message) | wrench.Sync(lambda o: o.text))
+           await (sentry | wrench.Type(engi.MessageReceived) | wrench.Lambda(lambda o: o.text))
 
+        :return: The resulting :class:`.SentryFilter`\\ .
+        :raises TypeError: If the right side operator is neither a :class:`~royalnet.engineer.wrench.Wrench` or a
+                           coroutine function.
         """
         try:
             return self.filter(other)
@@ -117,9 +135,9 @@ class Sentry(metaclass=abc.ABCMeta):
     @abc.abstractmethod
     def dispenser(self) -> Dispenser:
         """
-        Get the :class:`.Dispenser` that created this Sentry.
+        Get the :class:`~royalnet.engineer.dispenser.Dispenser` that created this :class:`.Sentry`.
 
-        :return: The :class:`.Dispenser` object.
+        :return: The :class:`~royalnet.engineer.dispenser.Dispenser` object.
         """
         raise NotImplementedError()
 
diff --git a/royalnet/engineer/teleporter.py b/royalnet/engineer/teleporter.py
index f85f5b0e..09afb796 100644
--- a/royalnet/engineer/teleporter.py
+++ b/royalnet/engineer/teleporter.py
@@ -1,5 +1,5 @@
 """
-The teleporter uses :mod:`pydantic` to validate function parameters and return values.
+This module contains the :class:`.Teleporter` class and its exceptions.
 """
 
 from __future__ import annotations
@@ -15,7 +15,29 @@ Value = t.TypeVar("Value")
 log = logging.getLogger(__name__)
 
 
+class TeleporterError(exc.EngineerException, pydantic.ValidationError):
+    """
+    The base class for errors in :mod:`royalnet.engineer.teleporter`.
+    """
+
+
+class InTeleporterError(TeleporterError):
+    """
+    The input parameters validation failed.
+    """
+
+
+class OutTeleporterError(TeleporterError):
+    """
+    The return value validation failed.
+    """
+
+
 class Teleporter:
+    """
+    A :class:`.Teleporter` is a function wrapper which uses :mod:`pydantic` to perform type checking
+    """
+
     def __init__(self,
                  f: t.Callable[..., t.Any],
                  validate_input: bool = True,
@@ -165,14 +187,14 @@ class Teleporter:
 
         :param kwargs: The keyword arguments that should be passed to the model.
         :return: The created model.
-        :raises .exc.InTeleporterError: If the kwargs fail the validation.
+        :raises .InTeleporterError: If the kwargs fail the validation.
         """
         log.debug(f"Teleporting in: {kwargs!r}")
         try:
             return self.InputModel(**kwargs)
         except pydantic.ValidationError as e:
             log.error(f"Teleport in failed: {e!r}")
-            raise exc.InTeleporterError(errors=e.raw_errors, model=e.model)
+            raise InTeleporterError(errors=e.raw_errors, model=e.model)
 
     def teleport_out(self, value: Value) -> pydantic.BaseModel:
         """
@@ -180,14 +202,14 @@ class Teleporter:
 
         :param value: The value that should be validated.
         :return: The created model.
-        :raises .exc.OutTeleporterError: If the value fails the validation.
+        :raises .OutTeleporterError: If the value fails the validation.
         """
         log.debug(f"Teleporting out: {value!r}")
         try:
             return self.OutputModel(__root__=value)
         except pydantic.ValidationError as e:
             log.error(f"Teleport out failed: {e!r}")
-            raise exc.OutTeleporterError(errors=e.raw_errors, model=e.model)
+            raise OutTeleporterError(errors=e.raw_errors, model=e.model)
 
     @staticmethod
     def _split_kwargs(**kwargs) -> t.Tuple[t.Dict[str, t.Any], t.Dict[str, t.Any]]:
@@ -212,7 +234,7 @@ class Teleporter:
 
     def _run(self, **kwargs) -> t.Any:
         """
-        Run the teleporter synchronously.
+        Run the :class:`.Teleporter` synchronously.
         """
         if self.InputModel:
             log.debug("Validating input...")
@@ -226,7 +248,7 @@ class Teleporter:
 
     async def _run_async(self, **kwargs) -> t.Awaitable[t.Any]:
         """
-        Run the teleporter asynchronously.
+        Run the :class:`.Teleporter` asynchronously.
         """
         if self.InputModel:
             log.debug("Validating input...")
@@ -246,5 +268,8 @@ class Teleporter:
 
 
 __all__ = (
+    "InTeleporterError",
+    "OutTeleporterError",
     "Teleporter",
+    "TeleporterError",
 )
diff --git a/royalnet/engineer/wrench.py b/royalnet/engineer/wrench.py
index 102594fb..a28728cb 100644
--- a/royalnet/engineer/wrench.py
+++ b/royalnet/engineer/wrench.py
@@ -12,6 +12,18 @@ from . import discard
 from . import exc
 
 
+class WrenchException(exc.EngineerException):
+    """
+    The base class for errors in :mod:`royalnet.engineer.wrench`.
+    """
+
+
+class DeliberateException(WrenchException):
+    """
+    This exception was deliberately raised by :class:`.ErrorAll`.
+    """
+
+
 class Wrench(metaclass=abc.ABCMeta):
     """
     The abstract base class for Wrenches.
@@ -67,7 +79,7 @@ class ErrorAll(Wrench):
     """
 
     async def filter(self, obj: t.Any) -> t.Any:
-        raise exc.DeliberateException("ErrorAll received an object")
+        raise DeliberateException("ErrorAll received an object")
 
 
 class CheckBase(Wrench, metaclass=abc.ABCMeta):
@@ -293,15 +305,17 @@ class Check(CheckBase):
 
 
 __all__ = (
-    "Wrench",
+    "Check",
     "CheckBase",
-    "Type",
-    "StartsWith",
-    "EndsWith",
     "Choice",
+    "DeliberateException",
+    "EndsWith",
+    "Lambda",
     "RegexCheck",
     "RegexMatch",
     "RegexReplace",
-    "Lambda",
-    "Check",
+    "StartsWith",
+    "Type",
+    "Wrench",
+    "WrenchException",
 )