diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 691c7ca..eb56885 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -6,3 +6,10 @@ updates:
     interval: daily
     time: "02:00"
   open-pull-requests-limit: 10
+
+- package-ecosystem: github-actions
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "02:00"
+  open-pull-requests-limit: 10
diff --git a/.github/workflows/shellcheck.yml b/.github/workflows/shellcheck.yml
new file mode 100644
index 0000000..7eb9179
--- /dev/null
+++ b/.github/workflows/shellcheck.yml
@@ -0,0 +1,30 @@
+name: shellcheck
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - 'tools/**/*.sh'
+      - '.github/workflows/shellcheck.yml'
+  pull_request:
+    paths:
+      - 'tools/**/*.sh'
+      - '.github/workflows/shellcheck.yml'
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ludeeus/action-shellcheck@2.0.0
+        env:
+          SHELLCHECK_OPTS: --shell bash
+        with:
+          severity: style
+          check_together: 'yes'
diff --git a/.github/workflows/tools.yml b/.github/workflows/tools.yml
new file mode 100644
index 0000000..8b8ff37
--- /dev/null
+++ b/.github/workflows/tools.yml
@@ -0,0 +1,48 @@
+name: test-tools
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - "tools/**"
+      - '.github/workflows/tools.yml'
+  pull_request:
+    paths:
+      - "tools/**"
+      - '.github/workflows/tools.yml'
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  mypy:
+    name: Run mypy
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install poetry
+        run: |
+          curl -sSL "https://install.python-poetry.org" | python
+
+          # Adding `poetry` to `$PATH`:
+          echo "$HOME/.poetry/bin" >> $GITHUB_PATH
+
+      - name: Install dependencies
+        run: |
+          cd tools
+          poetry config virtualenvs.in-project true
+          poetry run pip install -U pip
+          poetry install
+
+      - run: cd tools && poetry run mypy *.py
diff --git a/.github/workflows/validation.yml b/.github/workflows/validation.yml
new file mode 100644
index 0000000..4cad33d
--- /dev/null
+++ b/.github/workflows/validation.yml
@@ -0,0 +1,42 @@
+name: validate
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  validate:
+    name: Run validation
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install poetry
+        run: |
+          curl -sSL "https://install.python-poetry.org" | python
+
+          # Adding `poetry` to `$PATH`:
+          echo "$HOME/.poetry/bin" >> $GITHUB_PATH
+
+      - name: Install dependencies
+        run: |
+          cd tools
+          poetry config virtualenvs.in-project true
+          poetry run pip install -U pip
+          poetry install
+
+      - run: poetry run -C tools bash tools/validate.sh
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9de1c0b..6dbcca1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,9 +6,12 @@
 - Clarified `Legacy` rules
 - Clarified `Redirect` rules
 - Simplified `Monitoring` and `Firewall` rules: they now don't interact with `sudo`
+- Changed `Supply chain` card: it does not have ⚙️ effect anymore
 - Tweaked `Frontend` social interaction, again
 - Tweaked some minor wordings on multiple cards
 - Tweaked multiple other social interactions a bit
+- Fixed fonts on multiple cards
+- Added "Pytup" rule special card
 
 ## Version 0.0.8
 
diff --git a/ru/cards.numbers b/ru/cards.numbers
index c243a7a..d41158c 100755
Binary files a/ru/cards.numbers and b/ru/cards.numbers differ
diff --git a/ru/counts.numbers b/ru/counts.numbers
index a8fd46e..c7e7a1b 100755
Binary files a/ru/counts.numbers and b/ru/counts.numbers differ
diff --git a/tools/build.sh b/tools/build.sh
index 7698458..c9c7447 100644
--- a/tools/build.sh
+++ b/tools/build.sh
@@ -13,6 +13,9 @@ set -x
 # Clean existing build:
 rm -rf build
 
+# Run validation:
+source tools/validate.sh
+
 # Just all cards types in one pdf:
 CARDS_PDF="$1"
 # All cards in one pdf, with correct counts, useful for printing:
diff --git a/tools/generate-images-from-pdf.py b/tools/generate-images-from-pdf.py
index 146ceb8..c6731fb 100644
--- a/tools/generate-images-from-pdf.py
+++ b/tools/generate-images-from-pdf.py
@@ -2,7 +2,7 @@
 import io
 import os
 
-import pypdfium2 as pdf
+import pypdfium2 as pdf  # type: ignore[import-untyped]
 
 
 def _render_images(cards: io.BytesIO, output_dir: str) -> None:
diff --git a/tools/generate-pdf.py b/tools/generate-pdf.py
index fe5cae2..dc8fc25 100644
--- a/tools/generate-pdf.py
+++ b/tools/generate-pdf.py
@@ -23,20 +23,9 @@
 import io
 import os
 
-import numbers_parser
-import pypdfium2 as pdf
+import pypdfium2 as pdf  # type: ignore[import-untyped]
 
-
-def _read_counts(counts_path: str) -> list[int]:
-    document = numbers_parser.Document(counts_path)
-    table = document.sheets[0].tables[0]
-
-    read_counts = []
-    for row in range(table.num_rows):
-        cell = table.cell(f"C{row + 1}").value
-        if cell:
-            read_counts.append(int(cell))
-    return read_counts
+from ship_it_tools import counts
 
 
 def _write_cards_with_counts(
@@ -81,7 +70,7 @@ def main() -> None:
     parsed_args = parser.parse_args()
     _write_cards_with_counts(
         parsed_args.cards,
-        _read_counts(parsed_args.counts),
+        counts.read_counts(parsed_args.counts),
         parsed_args.output_file,
     )
 
diff --git a/tools/poetry.lock b/tools/poetry.lock
index dee4bed..804e414 100644
--- a/tools/poetry.lock
+++ b/tools/poetry.lock
@@ -1,18 +1,20 @@
-# This file is automatically @generated by Poetry 1.8.2 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.8.3 and should not be changed by hand.
 
 [[package]]
 name = "compact-json"
-version = "1.6.1"
+version = "1.8.1"
 description = "A JSON formatter that produces compact but human-readable"
 optional = false
-python-versions = ">=3.8,<4.0"
+python-versions = "<4.0,>=3.9"
 files = [
-    {file = "compact_json-1.6.1-py3-none-any.whl", hash = "sha256:867c1c0e331656400000f1a9a60c5e292f88608bb3f7987c0433124ab96b811a"},
-    {file = "compact_json-1.6.1.tar.gz", hash = "sha256:ebe6eb983ca0391452a4d91c5b27a7494df587668c517e6836f8e6b451ee8663"},
+    {file = "compact_json-1.8.1-py3-none-any.whl", hash = "sha256:1232321c1eb65d48a341265cd289996c02fe4ce213ffc4cfe948c3faf985ea0a"},
+    {file = "compact_json-1.8.1.tar.gz", hash = "sha256:1dfcd53a05e27725fd73d694028c6d9a4b5e7fe8586d0980d0f7d5b5672ee144"},
 ]
 
 [package.dependencies]
-wcwidth = ">=0.2.5,<0.3.0"
+importlib-resources = ">=6.1"
+setuptools = ">=69.0.3"
+wcwidth = ">0.2.8"
 
 [[package]]
 name = "cramjam"
@@ -128,13 +130,13 @@ dev = ["black (==22.3.0)", "hypothesis", "numpy", "pytest (>=5.30)", "pytest-xdi
 
 [[package]]
 name = "enum-tools"
-version = "0.11.0"
+version = "0.12.0"
 description = "Tools to expand Python's enum module."
 optional = false
 python-versions = ">=3.6"
 files = [
-    {file = "enum_tools-0.11.0-py3-none-any.whl", hash = "sha256:9e76186ff4fd1798a64a855d334e245a7d2b67970c40029acccff06c58bf0535"},
-    {file = "enum_tools-0.11.0.tar.gz", hash = "sha256:ed10ae4c2109c52e6ca17505a3bdb173b2554f5f0449677621829023a9d8bd33"},
+    {file = "enum_tools-0.12.0-py3-none-any.whl", hash = "sha256:d69b019f193c7b850b17d9ce18440db7ed62381571409af80ccc08c5218b340a"},
+    {file = "enum_tools-0.12.0.tar.gz", hash = "sha256:13ceb9376a4c5f574a1e7c5f9c8eb7f3d3fbfbb361cc18a738df1a58dfefd460"},
 ]
 
 [package.dependencies]
@@ -147,18 +149,75 @@ sphinx = ["sphinx (>=3.4.0)", "sphinx-jinja2-compat (>=0.1.1)", "sphinx-toolbox
 
 [[package]]
 name = "importlib-resources"
-version = "6.1.2"
+version = "6.4.0"
 description = "Read resources from Python packages"
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "importlib_resources-6.1.2-py3-none-any.whl", hash = "sha256:9a0a862501dc38b68adebc82970140c9e4209fc99601782925178f8386339938"},
-    {file = "importlib_resources-6.1.2.tar.gz", hash = "sha256:308abf8474e2dba5f867d279237cd4076482c3de7104a40b41426370e891549b"},
+    {file = "importlib_resources-6.4.0-py3-none-any.whl", hash = "sha256:50d10f043df931902d4194ea07ec57960f66a80449ff867bfe782b4c486ba78c"},
+    {file = "importlib_resources-6.4.0.tar.gz", hash = "sha256:cdb2b453b8046ca4e3798eb1d84f3cce1446a0e8e7b5ef4efb600f19fc398145"},
 ]
 
 [package.extras]
 docs = ["furo", "jaraco.packaging (>=9.3)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (<7.2.5)", "sphinx (>=3.5)", "sphinx-lint"]
-testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=2.2)", "pytest-mypy", "pytest-ruff (>=0.2.1)", "zipp (>=3.17)"]
+testing = ["jaraco.test (>=5.4)", "pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=2.2)", "pytest-mypy", "pytest-ruff (>=0.2.1)", "zipp (>=3.17)"]
+
+[[package]]
+name = "mypy"
+version = "1.10.0"
+description = "Optional static typing for Python"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "mypy-1.10.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:da1cbf08fb3b851ab3b9523a884c232774008267b1f83371ace57f412fe308c2"},
+    {file = "mypy-1.10.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:12b6bfc1b1a66095ab413160a6e520e1dc076a28f3e22f7fb25ba3b000b4ef99"},
+    {file = "mypy-1.10.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:9e36fb078cce9904c7989b9693e41cb9711e0600139ce3970c6ef814b6ebc2b2"},
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+    {file = "mypy-1.10.0-py3-none-any.whl", hash = "sha256:f8c083976eb530019175aabadb60921e73b4f45736760826aa1689dda8208aee"},
+    {file = "mypy-1.10.0.tar.gz", hash = "sha256:3d087fcbec056c4ee34974da493a826ce316947485cef3901f511848e687c131"},
+]
+
+[package.dependencies]
+mypy-extensions = ">=1.0.0"
+typing-extensions = ">=4.1.0"
+
+[package.extras]
+dmypy = ["psutil (>=4.0)"]
+install-types = ["pip"]
+mypyc = ["setuptools (>=50)"]
+reports = ["lxml"]
+
+[[package]]
+name = "mypy-extensions"
+version = "1.0.0"
+description = "Type system extensions for programs checked with the mypy type checker."
+optional = false
+python-versions = ">=3.5"
+files = [
+    {file = "mypy_extensions-1.0.0-py3-none-any.whl", hash = "sha256:4392f6c0eb8a5668a69e23d168ffa70f0be9ccfd32b5cc2d26a34ae5b844552d"},
+    {file = "mypy_extensions-1.0.0.tar.gz", hash = "sha256:75dbf8955dc00442a438fc4d0666508a9a97b6bd41aa2f0ffe9d2f2725af0782"},
+]
 
 [[package]]
 name = "numbers-parser"
@@ -370,37 +429,36 @@ xmp = ["defusedxml"]
 
 [[package]]
 name = "protobuf"
-version = "4.25.3"
+version = "5.26.1"
 description = ""
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "protobuf-4.25.3-cp310-abi3-win32.whl", hash = "sha256:d4198877797a83cbfe9bffa3803602bbe1625dc30d8a097365dbc762e5790faa"},
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-    {file = "protobuf-4.25.3-cp37-abi3-manylinux2014_aarch64.whl", hash = "sha256:e7cb0ae90dd83727f0c0718634ed56837bfeeee29a5f82a7514c03ee1364c019"},
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-    {file = "protobuf-4.25.3.tar.gz", hash = "sha256:25b5d0b42fd000320bd7830b349e3b696435f3b329810427a6bcce6a5492cc5c"},
+    {file = "protobuf-5.26.1-cp310-abi3-win32.whl", hash = "sha256:3c388ea6ddfe735f8cf69e3f7dc7611e73107b60bdfcf5d0f024c3ccd3794e23"},
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+    {file = "protobuf-5.26.1-cp37-abi3-manylinux2014_x86_64.whl", hash = "sha256:f7417703f841167e5a27d48be13389d52ad705ec09eade63dfc3180a959215d7"},
+    {file = "protobuf-5.26.1-cp38-cp38-win32.whl", hash = "sha256:d693d2504ca96750d92d9de8a103102dd648fda04540495535f0fec7577ed8fc"},
+    {file = "protobuf-5.26.1-cp38-cp38-win_amd64.whl", hash = "sha256:9b557c317ebe6836835ec4ef74ec3e994ad0894ea424314ad3552bc6e8835b4e"},
+    {file = "protobuf-5.26.1-cp39-cp39-win32.whl", hash = "sha256:b9ba3ca83c2e31219ffbeb9d76b63aad35a3eb1544170c55336993d7a18ae72c"},
+    {file = "protobuf-5.26.1-cp39-cp39-win_amd64.whl", hash = "sha256:7ee014c2c87582e101d6b54260af03b6596728505c79f17c8586e7523aaa8f8c"},
+    {file = "protobuf-5.26.1-py3-none-any.whl", hash = "sha256:da612f2720c0183417194eeaa2523215c4fcc1a1949772dc65f05047e08d5932"},
+    {file = "protobuf-5.26.1.tar.gz", hash = "sha256:8ca2a1d97c290ec7b16e4e5dff2e5ae150cc1582f55b5ab300d45cb0dfa90e51"},
 ]
 
 [[package]]
 name = "pygments"
-version = "2.17.2"
+version = "2.18.0"
 description = "Pygments is a syntax highlighting package written in Python."
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
 files = [
-    {file = "pygments-2.17.2-py3-none-any.whl", hash = "sha256:b27c2826c47d0f3219f29554824c30c5e8945175d888647acd804ddd04af846c"},
-    {file = "pygments-2.17.2.tar.gz", hash = "sha256:da46cec9fd2de5be3a8a784f434e4c4ab670b4ff54d605c4c2717e9d49c4c367"},
+    {file = "pygments-2.18.0-py3-none-any.whl", hash = "sha256:b8e6aca0523f3ab76fee51799c488e38782ac06eafcf95e7ba832985c8e7b13a"},
+    {file = "pygments-2.18.0.tar.gz", hash = "sha256:786ff802f32e91311bff3889f6e9a86e81505fe99f2735bb6d60ae0c5004f199"},
 ]
 
 [package.extras]
-plugins = ["importlib-metadata"]
 windows-terminal = ["colorama (>=0.4.6)"]
 
 [[package]]
@@ -427,13 +485,13 @@ files = [
 
 [[package]]
 name = "python-dateutil"
-version = "2.8.2"
+version = "2.9.0.post0"
 description = "Extensions to the standard Python datetime module"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
 files = [
-    {file = "python-dateutil-2.8.2.tar.gz", hash = "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86"},
-    {file = "python_dateutil-2.8.2-py2.py3-none-any.whl", hash = "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"},
+    {file = "python-dateutil-2.9.0.post0.tar.gz", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3"},
+    {file = "python_dateutil-2.9.0.post0-py2.py3-none-any.whl", hash = "sha256:a8b2bc7bffae282281c8140a97d3aa9c14da0b136dfe83f850eea9a5f7470427"},
 ]
 
 [package.dependencies]
@@ -554,18 +612,18 @@ files = [
 
 [[package]]
 name = "setuptools"
-version = "69.1.1"
+version = "69.5.1"
 description = "Easily download, build, install, upgrade, and uninstall Python packages"
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "setuptools-69.1.1-py3-none-any.whl", hash = "sha256:02fa291a0471b3a18b2b2481ed902af520c69e8ae0919c13da936542754b4c56"},
-    {file = "setuptools-69.1.1.tar.gz", hash = "sha256:5c0806c7d9af348e6dd3777b4f4dbb42c7ad85b190104837488eab9a7c945cf8"},
+    {file = "setuptools-69.5.1-py3-none-any.whl", hash = "sha256:c636ac361bc47580504644275c9ad802c50415c7522212252c033bd15f301f32"},
+    {file = "setuptools-69.5.1.tar.gz", hash = "sha256:6c1fccdac05a97e598fb0ae3bbed5904ccb317337a51139dcd51453611bbb987"},
 ]
 
 [package.extras]
-docs = ["furo", "jaraco.packaging (>=9.3)", "jaraco.tidelift (>=1.4)", "pygments-github-lexers (==0.0.5)", "rst.linker (>=1.9)", "sphinx (<7.2.5)", "sphinx (>=3.5)", "sphinx-favicon", "sphinx-inline-tabs", "sphinx-lint", "sphinx-notfound-page (>=1,<2)", "sphinx-reredirects", "sphinxcontrib-towncrier"]
-testing = ["build[virtualenv]", "filelock (>=3.4.0)", "flake8-2020", "ini2toml[lite] (>=0.9)", "jaraco.develop (>=7.21)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "packaging (>=23.2)", "pip (>=19.1)", "pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=2.2)", "pytest-home (>=0.5)", "pytest-mypy (>=0.9.1)", "pytest-perf", "pytest-ruff (>=0.2.1)", "pytest-timeout", "pytest-xdist", "tomli-w (>=1.0.0)", "virtualenv (>=13.0.0)", "wheel"]
+docs = ["furo", "jaraco.packaging (>=9.3)", "jaraco.tidelift (>=1.4)", "pygments-github-lexers (==0.0.5)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-favicon", "sphinx-inline-tabs", "sphinx-lint", "sphinx-notfound-page (>=1,<2)", "sphinx-reredirects", "sphinxcontrib-towncrier"]
+testing = ["build[virtualenv]", "filelock (>=3.4.0)", "importlib-metadata", "ini2toml[lite] (>=0.9)", "jaraco.develop (>=7.21)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "mypy (==1.9)", "packaging (>=23.2)", "pip (>=19.1)", "pytest (>=6,!=8.1.1)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=2.2)", "pytest-home (>=0.5)", "pytest-mypy", "pytest-perf", "pytest-ruff (>=0.2.1)", "pytest-timeout", "pytest-xdist (>=3)", "tomli", "tomli-w (>=1.0.0)", "virtualenv (>=13.0.0)", "wheel"]
 testing-integration = ["build[virtualenv] (>=1.0.3)", "filelock (>=3.4.0)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "packaging (>=23.2)", "pytest", "pytest-enabler", "pytest-xdist", "tomli", "virtualenv (>=13.0.0)", "wheel"]
 
 [[package]]
@@ -604,15 +662,26 @@ files = [
     {file = "sortedcontainers-2.4.0.tar.gz", hash = "sha256:25caa5a06cc30b6b83d11423433f65d1f9d76c4c6a0c90e3379eaa43b9bfdb88"},
 ]
 
+[[package]]
+name = "types-pillow"
+version = "10.2.0.20240520"
+description = "Typing stubs for Pillow"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "types-Pillow-10.2.0.20240520.tar.gz", hash = "sha256:130b979195465fa1e1676d8e81c9c7c30319e8e95b12fae945e8f0d525213107"},
+    {file = "types_Pillow-10.2.0.20240520-py3-none-any.whl", hash = "sha256:33c36494b380e2a269bb742181bea5d9b00820367822dbd3760f07210a1da23d"},
+]
+
 [[package]]
 name = "typing-extensions"
-version = "4.10.0"
+version = "4.11.0"
 description = "Backported and Experimental Type Hints for Python 3.8+"
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "typing_extensions-4.10.0-py3-none-any.whl", hash = "sha256:69b1a937c3a517342112fb4c6df7e72fc39a38e7891a5730ed4985b5214b5475"},
-    {file = "typing_extensions-4.10.0.tar.gz", hash = "sha256:b0abd7c89e8fb96f98db18d86106ff1d90ab692004eb746cf6eda2682f91b3cb"},
+    {file = "typing_extensions-4.11.0-py3-none-any.whl", hash = "sha256:c1f94d72897edaf4ce775bb7558d5b79d8126906a14ea5ed1635921406c0387a"},
+    {file = "typing_extensions-4.11.0.tar.gz", hash = "sha256:83f085bd5ca59c80295fc2a82ab5dac679cbe02b9f33f7d83af68e241bea51b0"},
 ]
 
 [[package]]
@@ -640,4 +709,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11"
-content-hash = "e87761739d87e5b5f7cb3f5303fa91ecf23c7de7ac57305d8530ec498fc78efc"
+content-hash = "36b5a65e89042a768a4900079b1cf338990a696acba6d635cc3685ea22f89f92"
diff --git a/tools/pyproject.toml b/tools/pyproject.toml
index 94e1362..276d2a4 100644
--- a/tools/pyproject.toml
+++ b/tools/pyproject.toml
@@ -1,13 +1,12 @@
 [tool.poetry]
 name = "ship-it-tools"
-version = "0.0.8"
+version = "0.0.1"
 description = "Internal tools we use for the game development"
 authors = ["sobolevn <mail@sobolevn.me>"]
 license = "CC BY-NC-SA 4.0"
 classifiers = [
   "Private :: Do not Upload",
 ]
-package-mode = false
 
 [tool.poetry.dependencies]
 python = "^3.11"
@@ -16,6 +15,10 @@ numbers-parser = "^4.10.5"
 pypdfium2 = "^4.30.0"
 pillow = "^10.3.0"
 
+[tool.poetry.group.dev.dependencies]
+mypy = "^1.10"
+types-pillow = "^10.2"
+
 
 [tool.ruff]
 line-length = 80
@@ -25,6 +28,13 @@ fix = true
 select = ['F', 'I']
 fixable = ['ALL']
 
+[tool.ruff.lint.isort]
+known-first-party = ["ship_it_tools"]
+
+
+[tool.mypy]
+strict = true
+
 
 [build-system]
 requires = ["poetry-core"]
diff --git a/tools/ship_it_tools/__init__.py b/tools/ship_it_tools/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tools/ship_it_tools/counts.py b/tools/ship_it_tools/counts.py
new file mode 100644
index 0000000..eb6ddc1
--- /dev/null
+++ b/tools/ship_it_tools/counts.py
@@ -0,0 +1,14 @@
+import numbers_parser  # type: ignore[import-untyped]
+
+
+def read_counts(counts_path: str) -> list[int]:
+    """Return the list of ints of cards' counts definned in `counts.numbers`."""
+    document = numbers_parser.Document(counts_path)
+    table = document.sheets[0].tables[0]
+
+    read_counts = []
+    for row in range(table.num_rows):
+        cell = table.cell(f"C{row + 1}").value
+        if cell:
+            read_counts.append(int(cell))
+    return read_counts
diff --git a/tools/tts-exporter.py b/tools/tts-exporter.py
index 4eb479a..b2223c3 100644
--- a/tools/tts-exporter.py
+++ b/tools/tts-exporter.py
@@ -89,6 +89,7 @@ def _create_sheet(
         current_image.close()
 
     # Resize to be 10k pixels max:
+    assert dest_image
     wpercent = TTS_MAX_SIZE / dest_image.size[0]
     hsize = int(dest_image.size[1] * wpercent)
     filename_suffix = "back" if is_back else "front"
diff --git a/tools/validate-cards.py b/tools/validate-cards.py
new file mode 100644
index 0000000..1191ee4
--- /dev/null
+++ b/tools/validate-cards.py
@@ -0,0 +1,51 @@
+import argparse
+from typing import Final
+
+import numbers_parser  # type: ignore[import-untyped]
+
+from ship_it_tools import counts
+
+_NUMBER_OF_PLAYERS: Final = 5
+
+
+def _read_card_counts(cards_path: str) -> list[int]:
+    document = numbers_parser.Document(cards_path)
+
+    card_counts = []
+    for card_sheet in document.sheets:
+        cell_value = card_sheet.tables[0].cell("E18").value
+        if cell_value.startswith(" ="):  # `= number of players`
+            card_counts.append(_NUMBER_OF_PLAYERS)
+        else:
+            card_counts.append(int(cell_value.split(" ")[0]))
+    return card_counts
+
+
+def _validate(cards_path: str, counts: list[int]) -> None:
+    card_counts = _read_card_counts(cards_path)
+    if card_counts != counts:
+        raise ValueError("Not equal", card_counts, counts)
+
+
+def main() -> None:
+    """Run the script."""
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "cards",
+        type=str,  # TODO: use `filepath` type
+        help="Path to `cards.numbers` file with cards definitions",
+    )
+    parser.add_argument(
+        "counts",
+        type=str,  # TODO: use `filepath` type
+        help="Path to `counts.numbers` file with card counts",
+    )
+    parsed_args = parser.parse_args()
+    _validate(
+        parsed_args.cards,
+        counts.read_counts(parsed_args.counts),
+    )
+
+
+if __name__ == "__main__":
+    main()
diff --git a/tools/validate.sh b/tools/validate.sh
new file mode 100644
index 0000000..cb837b7
--- /dev/null
+++ b/tools/validate.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+set -e
+
+# Check if card counts are identical in `counts.numbers` and `cards.numbers`:
+python tools/validate-cards.py ru/cards.numbers ru/counts.numbers