diff --git a/.github/workflows/lib-checks.yml b/.github/workflows/lib-checks.yml
index d3d89ad742..c2f10142eb 100644
--- a/.github/workflows/lib-checks.yml
+++ b/.github/workflows/lib-checks.yml
@@ -93,3 +93,21 @@ jobs:
         run: mkdir -p -v .mypy_cache
       - name: "Run mypy"
         run: uv run mypy --non-interactive discord/
+  slotscheck:
+    if: ${{ github.event_name != 'schedule' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout Repository"
+        uses: actions/checkout@v4
+      - name: "Setup Python"
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+      - name: "Install uv"
+        uses: astral-sh/setup-uv@v6
+        with:
+          enable-cache: true
+      - name: Sync dependencies
+        run: uv sync --no-python-downloads --group dev
+      - name: "Run slotscheck"
+        run: uv run slotscheck discord
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 0eb5126370..18f6a4d555 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -32,3 +32,12 @@ repos:
       - id: prettier
         args: [--prose-wrap=always, --print-width=88]
         exclude: \.(po|pot|yml|yaml)$
+  - repo: https://github.com/ariebovenberg/slotscheck
+    rev: v0.19.1
+    hooks:
+      - id: slotscheck
+        language: python
+        additional_dependencies:
+          - "typing-extensions>=4,<5"
+          - "colorlog~=6.9.0"
+          - "aiohttp>=3.6.0,<4.0"
\ No newline at end of file
diff --git a/discord/activity.py b/discord/activity.py
index 3377892aa8..a71abd8649 100644
--- a/discord/activity.py
+++ b/discord/activity.py
@@ -204,7 +204,6 @@ class Activity(BaseActivity):
     __slots__ = (
         "state",
         "details",
-        "_created_at",
         "timestamps",
         "assets",
         "party",
diff --git a/discord/asset.py b/discord/asset.py
index c54162de83..266fa16a29 100644
--- a/discord/asset.py
+++ b/discord/asset.py
@@ -56,6 +56,8 @@ class AssetMixin:
     url: str
     _state: Any | None
 
+    __slots__: tuple[str, ...] = ("_state", "url")
+
     async def read(self) -> bytes:
         """|coro|
 
@@ -155,7 +157,6 @@ class Asset(AssetMixin):
     """
 
     __slots__: tuple[str, ...] = (
-        "_state",
         "_url",
         "_animated",
         "_key",
diff --git a/discord/components.py b/discord/components.py
index 4cd8c0e1c0..1e5a18db40 100644
--- a/discord/components.py
+++ b/discord/components.py
@@ -219,7 +219,6 @@ class InputText(Component):
     """
 
     __slots__: tuple[str, ...] = (
-        "type",
         "style",
         "custom_id",
         "label",
@@ -228,7 +227,6 @@ class InputText(Component):
         "max_length",
         "required",
         "value",
-        "id",
     )
 
     __repr_info__: ClassVar[tuple[str, ...]] = __slots__
diff --git a/discord/emoji.py b/discord/emoji.py
index 40df9ca252..85bb051ffe 100644
--- a/discord/emoji.py
+++ b/discord/emoji.py
@@ -54,9 +54,7 @@ class BaseEmoji(_EmojiTag, AssetMixin):
         "require_colons",
         "animated",
         "managed",
-        "id",
         "name",
-        "_state",
         "user",
         "available",
     )
diff --git a/discord/partial_emoji.py b/discord/partial_emoji.py
index b59e1e9fdd..39bbf506d6 100644
--- a/discord/partial_emoji.py
+++ b/discord/partial_emoji.py
@@ -92,7 +92,7 @@ class PartialEmoji(_EmojiTag, AssetMixin):
         The ID of the custom emoji, if applicable.
     """
 
-    __slots__ = ("animated", "name", "id", "_state")
+    __slots__ = ("animated", "name", "id")
 
     _CUSTOM_EMOJI_RE = re.compile(r"<?(?P<animated>a)?:?(?P<name>\w+):(?P<id>[0-9]{13,20})>?")
 
diff --git a/discord/raw_models.py b/discord/raw_models.py
index e16a2f5018..ba44f92f37 100644
--- a/discord/raw_models.py
+++ b/discord/raw_models.py
@@ -85,6 +85,8 @@
 
 
 class _RawReprMixin:
+    __slots__ = ()
+
     def __repr__(self) -> str:
         value = " ".join(f"{attr}={getattr(self, attr)!r}" for attr in self.__slots__)
         return f"<{self.__class__.__name__} {value}>"
diff --git a/discord/sticker.py b/discord/sticker.py
index 6fb3e5ba38..8f48226c31 100644
--- a/discord/sticker.py
+++ b/discord/sticker.py
@@ -201,7 +201,7 @@ class StickerItem(_StickerTag):
         The URL for the sticker's image.
     """
 
-    __slots__ = ("_state", "name", "id", "format", "url")
+    __slots__ = ("name", "id", "format")
 
     def __init__(self, *, state: ConnectionState, data: StickerItemPayload):
         self._state: ConnectionState = state
@@ -272,7 +272,7 @@ class Sticker(_StickerTag):
         The URL for the sticker's image.
     """
 
-    __slots__ = ("_state", "id", "name", "description", "format", "url")
+    __slots__ = ("id", "name", "description", "format")
 
     def __init__(self, *, state: ConnectionState, data: StickerPayload) -> None:
         self._state: ConnectionState = state
diff --git a/discord/widget.py b/discord/widget.py
index eb54e606b3..d4cb03acf4 100644
--- a/discord/widget.py
+++ b/discord/widget.py
@@ -153,13 +153,9 @@ class WidgetMember(BaseUser):
     """
 
     __slots__ = (
-        "name",
         "status",
         "nick",
         "avatar",
-        "discriminator",
-        "id",
-        "bot",
         "activity",
         "deafened",
         "suppress",
diff --git a/pyproject.toml b/pyproject.toml
index 6473d4cdc8..bcb3b518f6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -75,6 +75,7 @@ dev = [
     "pytest-asyncio~=0.26.0",
     "python-dotenv>=1.1.1",
     "ruff>=0.11.9",
+    "slotscheck==0.19.1",
 ]
 ci = [
     "pygithub>=2.7.0",
diff --git a/uv.lock b/uv.lock
index bcbffc0b57..028309d965 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1360,6 +1360,7 @@ dev = [
     { name = "pytest-asyncio" },
     { name = "python-dotenv" },
     { name = "ruff" },
+    { name = "slotscheck" },
 ]
 docs = [
     { name = "furo" },
@@ -1397,6 +1398,7 @@ dev = [
     { name = "pytest-asyncio", specifier = "~=0.26.0" },
     { name = "python-dotenv", specifier = ">=1.1.1" },
     { name = "ruff", specifier = ">=0.11.9" },
+    { name = "slotscheck", specifier = ">=0.19.1" },
 ]
 docs = [
     { name = "furo", specifier = "==2024.8.6" },
@@ -1766,6 +1768,19 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/84/a8/001d4a7c2b37623a3fd7463208267fb906df40ff31db496157549cfd6e72/ruff-0.12.11-py3-none-win_arm64.whl", hash = "sha256:bae4d6e6a2676f8fb0f98b74594a048bae1b944aab17e9f5d504062303c6dbea", size = 12135290, upload-time = "2025-08-28T13:59:06.933Z" },
 ]
 
+[[package]]
+name = "slotscheck"
+version = "0.19.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "click" },
+    { name = "tomli", marker = "python_full_version < '3.11'" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/4b/57/6fcb8df11e7c76eb87b23bfa931408e47f051c6161749c531b4060a45516/slotscheck-0.19.1.tar.gz", hash = "sha256:6146b7747f8db335a00a66b782f86011b74b995f61746dc5b36a9e77d5326013", size = 16050 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/da/32/bd569256267f80b76b87d21a09795741a175778b954bee1d7b1a89852b6f/slotscheck-0.19.1-py3-none-any.whl", hash = "sha256:bff9926f8d6408ea21b6c6bbaa4389cea1682962e73ee4f30084b6d2b89260ee", size = 16995 },
+]
+
 [[package]]
 name = "snowballstemmer"
 version = "3.0.1"