diff --git a/.github/workflows/measure-classic-check.yml b/.github/workflows/measure-classic-check.yml
index 66a1b6e..97894e9 100644
--- a/.github/workflows/measure-classic-check.yml
+++ b/.github/workflows/measure-classic-check.yml
@@ -15,6 +15,7 @@ on:
       - tools/build-sdl3-mixer.sh
       - tools/measure-classic-check-images.sh
       - tools/smoke-classic-check.sh
+      - tools/smoke-git-lfs.sh
       - tools/tests/**
       - tools/validate-toolchains.sh
       - tools/verify-classic-check-package.py
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 1afe64a..cde6812 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -45,6 +45,7 @@ jobs:
                 tools/build-sdl3-mixer.sh | \
                 tools/install_classic_vulkan_toolchain.py | \
                 tools/require-image-checks.sh | \
+                tools/smoke-git-lfs.sh | \
                 tools/test-require-image-checks.sh | \
                 tools/validate-toolchains.sh | \
                 tools/validate-vulkan-toolchain.sh)
@@ -63,6 +64,7 @@ jobs:
                 classic-vulkan-packages.lock | \
                 tools/audio/* | tools/build-sdl3-mixer.sh | \
                 tools/require-image-checks.sh | \
+                tools/smoke-git-lfs.sh | \
                 tools/test-require-image-checks.sh | \
                 tools/validate-classic-check.sh | \
                 tools/validate-classic-image.sh | \
diff --git a/AGENTS.md b/AGENTS.md
index 9381c8a..86cffec 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -20,6 +20,10 @@
   revision, shader-toolchain inventory, GPU runtime, smoke/SBOM checks, and
   published tags synchronized. Do not make it inherit the broad
   replacement/development toolchain.
+- The broad Linux and `classic-final` images include the snapshot-pinned Git LFS
+  client. Keep the Linux tool manifests, Classic package lock, non-root version
+  checks, and isolated worktree/payload smoke synchronized when changing this
+  prerequisite.
 - The public Classic image's shader contract is defined by
   `classic-shader-toolchain.json`: retain the exact DXC/SPIRV-Cross archive and
   source checksums, upstream licenses, and `/usr/local/bin` tool paths. Its
diff --git a/README.md b/README.md
index 94c24b9..55cebaa 100644
--- a/README.md
+++ b/README.md
@@ -84,6 +84,10 @@ docker build --file windows/Dockerfile \
   --tag atrinik-windows-check .
 
 docker run --rm atrinik-linux-build clang --version
+docker run --rm --user ubuntu --env HOME=/home/ubuntu \
+  atrinik-linux-build git lfs version
+docker run --rm --user ubuntu --env HOME=/home/ubuntu \
+  atrinik-linux-build atrinik-git-lfs-smoke
 docker run --rm --user ubuntu --env HOME=/home/ubuntu \
   atrinik-linux-build gh version
 docker run --rm --user ubuntu --env HOME=/home/ubuntu \
@@ -107,6 +111,10 @@ docker run --rm atrinik-linux-build node --version
 docker run --rm atrinik-linux-build pnpm --version
 docker run --rm atrinik-classic-build gcc --version
 docker run --rm atrinik-classic-build cmake --version
+docker run --rm --user ubuntu --env HOME=/home/ubuntu \
+  atrinik-classic-build git lfs version
+docker run --rm --user ubuntu --env HOME=/home/ubuntu \
+  atrinik-classic-build atrinik-git-lfs-smoke
 docker run --rm atrinik-classic-build ccache --version
 docker run --rm atrinik-classic-build dxc --version
 docker run --rm atrinik-classic-build spirv-cross --help
diff --git a/classic-packages.lock b/classic-packages.lock
index 0fc08a5..90e1d80 100644
--- a/classic-packages.lock
+++ b/classic-packages.lock
@@ -9,6 +9,7 @@ g++=4:15.2.0-5ubuntu1
 gcc=4:15.2.0-5ubuntu1
 gcovr=7.2+really-2
 git=1:2.53.0-1ubuntu1
+git-lfs=3.7.1-1
 jq=1.8.1-4ubuntu2
 libcurl4-openssl-dev=8.18.0-1ubuntu2.3
 libdrm2=2.4.131-1
diff --git a/classic-toolchain.json b/classic-toolchain.json
index f12c229..c665fa5 100644
--- a/classic-toolchain.json
+++ b/classic-toolchain.json
@@ -14,6 +14,7 @@
     "cmake": "4.2.3",
     "gcc": "15.2.0",
     "gcovr": "7.2",
+    "git-lfs": "3.7.1",
     "ninja": "1.13.2",
     "python": "3.14.4"
   },
diff --git a/linux/Dockerfile b/linux/Dockerfile
index 9a38be8..666a848 100644
--- a/linux/Dockerfile
+++ b/linux/Dockerfile
@@ -140,6 +140,7 @@ RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
         fzf \
         gdb \
         git \
+        git-lfs \
         iproute2 \
         jq \
         libasound2-plugins \
@@ -210,6 +211,7 @@ ARG GH_STACK_SHA256_AMD64=358552dd7dce0a46ce153fe196270cec482b84f080947890aad406
 ARG GH_STACK_SOURCE_COMMIT=a1b4a3d4d0bcde9ec3a78ab99b2d63af121857a9
 ARG GH_STACK_LICENSE_SHA256=2510b446bc1f0cf9702453075d20cd88631e20e5642658edb7325d9c1eb534f7
 ARG GIT_VERSION=2.53.0
+ARG GIT_LFS_VERSION=3.7.1
 ARG GO_VERSION=1.26.5
 ARG GO_SHA256=5c2c3b16caefa1d968a94c1daca04a7ca301a496d9b086e17ad77bb81393f053
 ARG NODE_VERSION=24.18.1
@@ -386,7 +388,9 @@ RUN HOME="/home/${USERNAME}" runuser -u "${USERNAME}" -- \
     && rm -rf "/home/${USERNAME}/.cache/gh" \
         "/home/${USERNAME}/.local/state/gh"
 
-RUN clang --version \
+COPY tools/smoke-git-lfs.sh /usr/local/bin/atrinik-git-lfs-smoke
+RUN chmod 0755 /usr/local/bin/atrinik-git-lfs-smoke \
+    && clang --version \
     && test "$(go env GOVERSION)" = "go${GO_VERSION}" \
     && test "$(rustc --version | cut -d' ' -f2)" = "${RUST_VERSION}" \
     && test "$(node --version)" = "v${NODE_VERSION}" \
@@ -401,6 +405,9 @@ RUN clang --version \
         = "${GH_VERSION}" \
     && test "$(runuser -u "${USERNAME}" -- env HOME="/home/${USERNAME}" \
         git version)" = "git version ${GIT_VERSION}" \
+    && test "$(runuser -u "${USERNAME}" -- env HOME="/home/${USERNAME}" \
+        git lfs version | sed -n '1s|^git-lfs/\([^ ]*\).*$|\1|p')" \
+        = "${GIT_LFS_VERSION}" \
     && test "$(runuser -u "${USERNAME}" -- env HOME="/home/${USERNAME}" \
         gh stack --version)" = "gh stack version ${GH_STACK_VERSION}" \
     && runuser -u "${USERNAME}" -- env HOME="/home/${USERNAME}" \
@@ -417,7 +424,9 @@ RUN clang --version \
     && command -v xvfb-run \
     && ssh -V \
     && zip -v >/dev/null \
-    && unzip -v >/dev/null
+    && unzip -v >/dev/null \
+    && runuser -u "${USERNAME}" -- env HOME="/home/${USERNAME}" \
+        bash /usr/local/bin/atrinik-git-lfs-smoke
 
 COPY toolchains.json /usr/local/share/atrinik/toolchains.json
 COPY audio-toolchain.json /usr/local/share/atrinik/audio-toolchain.json
@@ -439,6 +448,7 @@ COPY audio-toolchain.spdx.json /workspace/audio-toolchain.spdx.json
 COPY classic-vulkan-toolchain.json /workspace/classic-vulkan-toolchain.json
 COPY classic-vulkan-toolchain.spdx.json /workspace/classic-vulkan-toolchain.spdx.json
 COPY tools/validate-toolchains.sh /workspace/tools/validate-toolchains.sh
+COPY tools/smoke-git-lfs.sh /workspace/tools/smoke-git-lfs.sh
 COPY tools/validate-vulkan-toolchain.sh \
     /workspace/tools/validate-vulkan-toolchain.sh
 
@@ -552,6 +562,11 @@ RUN test "${TARGETARCH}" = amd64 \
     && rm -f /etc/apt/apt.conf.d/80-snapshot-retries \
     && rm -rf /var/lib/apt/lists/* /var/cache/apt/archives/*.deb
 
+COPY tools/smoke-git-lfs.sh /usr/local/bin/atrinik-git-lfs-smoke
+RUN chmod 0755 /usr/local/bin/atrinik-git-lfs-smoke \
+    && runuser -u ubuntu -- env HOME=/home/ubuntu \
+        bash /usr/local/bin/atrinik-git-lfs-smoke
+
 COPY --from=mesa-dozen \
     /usr/lib/x86_64-linux-gnu/libvulkan_dzn.so \
     /usr/lib/x86_64-linux-gnu/libvulkan_dzn.so
@@ -648,6 +663,7 @@ COPY classic-vulkan-toolchain.spdx.json /workspace/classic-vulkan-toolchain.spdx
 COPY audio-toolchain.json /workspace/audio-toolchain.json
 COPY linux/Dockerfile /workspace/linux/Dockerfile
 COPY tools/validate-classic-image.sh /workspace/tools/validate-classic-image.sh
+COPY tools/smoke-git-lfs.sh /workspace/tools/smoke-git-lfs.sh
 COPY tools/validate-vulkan-toolchain.sh \
     /workspace/tools/validate-vulkan-toolchain.sh
 
diff --git a/toolchains.json b/toolchains.json
index 6459d8f..d254098 100644
--- a/toolchains.json
+++ b/toolchains.json
@@ -4,6 +4,7 @@
   "platform": "linux/amd64",
   "tools": {
     "buf": "1.72.0",
+    "git-lfs": "3.7.1",
     "go": "1.26.5",
     "node": "24.18.1",
     "pnpm": "11.20.0",
diff --git a/tools/smoke-git-lfs.sh b/tools/smoke-git-lfs.sh
new file mode 100755
index 0000000..8b28f31
--- /dev/null
+++ b/tools/smoke-git-lfs.sh
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ $# -ne 0 ]]; then
+  echo "usage: $0" >&2
+  exit 2
+fi
+
+work=$(mktemp -d)
+trap 'rm -rf -- "${work}"' EXIT
+repo="${work}/repo"
+checkout="${work}/worktree"
+payload='Atrinik Git LFS smoke payload'
+
+git init --quiet "${repo}"
+git -C "${repo}" config user.email 'image-smoke@example.invalid'
+git -C "${repo}" config user.name 'Atrinik image smoke'
+git -C "${repo}" lfs install --local >/dev/null
+git -C "${repo}" lfs track '*.payload' >/dev/null
+printf '%s\n' "${payload}" > "${repo}/sample.payload"
+git -C "${repo}" add .gitattributes sample.payload
+git -C "${repo}" commit --quiet -m 'smoke Git LFS payload'
+git -C "${repo}" worktree add --quiet "${checkout}" HEAD
+
+test "$(git -C "${checkout}" lfs ls-files --name-only)" = 'sample.payload'
+test "$(cat "${checkout}/sample.payload")" = "${payload}"
+test "$(git -C "${checkout}" check-attr filter -- sample.payload)" = \
+  'sample.payload: filter: lfs'
+test "$(git -C "${repo}" show HEAD:sample.payload | sed -n '1p')" = \
+  'version https://git-lfs.github.com/spec/v1'
+
+echo 'git-lfs smoke: passed'
diff --git a/tools/validate-classic-image.sh b/tools/validate-classic-image.sh
index 55782c6..cfad644 100755
--- a/tools/validate-classic-image.sh
+++ b/tools/validate-classic-image.sh
@@ -180,6 +180,10 @@ while IFS='=' read -r package version; do
   test "$(dpkg-query --show --showformat='${Version}' "${package}")" = "${version}"
 done < "${package_lock}"
 
+test "$(git lfs version | sed -n '1s|^git-lfs/\([^ ]*\).*$|\1|p')" = \
+  "$(jq -r '.tools["git-lfs"]' "${expected}")"
+bash "$(dirname -- "${BASH_SOURCE[0]}")/smoke-git-lfs.sh"
+
 test "$(ccache --version | sed -n '1s/^ccache version //p')" = \
   "$(jq -r '.tools.ccache' "${expected}")"
 test "$(cmake --version | sed -n '1s/^cmake version //p')" = \
diff --git a/tools/validate-toolchains.sh b/tools/validate-toolchains.sh
index 62c1049..14d7284 100755
--- a/tools/validate-toolchains.sh
+++ b/tools/validate-toolchains.sh
@@ -14,7 +14,7 @@ jq -e '
   .schema_version == 1
   and .platform == "linux/amd64"
   and (.tools | keys == [
-    "buf", "go", "node", "pnpm", "protoc", "protoc-gen-go",
+    "buf", "git-lfs", "go", "node", "pnpm", "protoc", "protoc-gen-go",
     "protoc-gen-prost", "rust", "rustup", "syft", "trivy"
   ])
   and (.consumers | length == 7)
@@ -41,8 +41,11 @@ if [[ -n ${installed} ]]; then
     "$(jq -r '.tools.syft' "${expected}")"
   test "$(trivy --version | sed -n '1s/^Version: //p')" = \
     "$(jq -r '.tools.trivy' "${expected}")"
+  test "$(git lfs version | sed -n '1s|^git-lfs/\([^ ]*\).*$|\1|p')" = \
+    "$(jq -r '.tools["git-lfs"]' "${expected}")"
   command -v Xvfb >/dev/null
   command -v xvfb-run >/dev/null
+  bash "$(dirname -- "${BASH_SOURCE[0]}")/smoke-git-lfs.sh"
 fi
 
 jq -e '