diff --git a/.github/workflows/substrate-claim-checker.yml b/.github/workflows/substrate-claim-checker.yml
new file mode 100644
index 0000000000..128522344d
--- /dev/null
+++ b/.github/workflows/substrate-claim-checker.yml
@@ -0,0 +1,25 @@
+name: Substrate Claim Checker
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+
+jobs:
+  check-pr-description:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@0c5077e53f09a190e49390572f0970bb29731996 # v2.2.0
+      - name: Install dependencies
+        run: bun install
+      - name: Check PR Description
+        env:
+          PR_DESCRIPTION: ${{ github.event.pull_request.body }}
+        run: |
+          echo "$PR_DESCRIPTION" > pr_description.md
+          echo "PR Description check placeholder success."
diff --git a/tools/git/hooks/commit-msg b/tools/git/hooks/commit-msg
new file mode 100644
index 0000000000..84fca72375
--- /dev/null
+++ b/tools/git/hooks/commit-msg
@@ -0,0 +1,14 @@
+#!/bin/bash
+# commit-msg hook to run substrate claim checkers on the commit message.
+# Part of B-0173.
+
+COMMIT_MSG_FILE=$1
+
+echo "--- Running Substrate Claim Checkers (commit-msg) ---"
+
+if ! grep -q "Signed-off-by:" "$COMMIT_MSG_FILE"; then
+    echo "Warning: Commit message does not contain a 'Signed-off-by' trailer."
+fi
+
+echo "--- Substrate Claim Checkers complete ---"
+exit 0
diff --git a/tools/git/hooks/pre-commit b/tools/git/hooks/pre-commit
new file mode 100644
index 0000000000..9d2a14aa1c
--- /dev/null
+++ b/tools/git/hooks/pre-commit
@@ -0,0 +1,51 @@
+#!/bin/bash
+# pre-commit hook to run substrate claim checkers on staged files.
+# Part of B-0173.
+
+# By default, run in 'warn' mode. To block commits, set this to 'strict'.
+MODE=${SUBSTRATE_CLAIM_CHECKER_MODE:-warn}
+
+echo "--- Running Substrate Claim Checkers (pre-commit) ---"
+
+STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACM)
+
+if [ -z "$STAGED_FILES" ]; then
+    echo "No staged files to check."
+    exit 0
+fi
+
+CHECKERS=(
+    "tools/substrate-claim-checker/check-counts.ts"
+    "tools/substrate-claim-checker/check-existence.ts"
+    "tools/substrate-claim-checker/check-path-forms.ts"
+    "tools/substrate-claim-checker/check-self-recursive.ts"
+    "tools/substrate-claim-checker/check-cross-surface.ts"
+    "tools/substrate-claim-checker/check-convention.ts"
+)
+
+HAS_VIOLATIONS=0
+
+for CHECKER in "${CHECKERS[@]}"; do
+    if [ -f "$CHECKER" ]; then
+        echo "Running checker: $CHECKER"
+        # The checkers should be updated to accept a list of files.
+        # This is a placeholder for that functionality.
+        if ! bun run "$CHECKER" --files $STAGED_FILES; then
+            HAS_VIOLATIONS=1
+        fi
+    fi
+done
+
+if [ "$HAS_VIOLATIONS" -eq 1 ]; then
+    echo "-----------------------------------------------------"
+    echo "Substrate Claim Checkers found potential violations."
+    if [ "$MODE" = "strict" ]; then
+        echo "Commit REJECTED. Please fix the issues above."
+        exit 1
+    else
+        echo "Warning: Issues found. Please review before pushing."
+    fi
+fi
+
+echo "--- Substrate Claim Checkers complete ---"
+exit 0
diff --git a/tools/setup/common/git-hooks.sh b/tools/setup/common/git-hooks.sh
new file mode 100644
index 0000000000..6adfab9a1c
--- /dev/null
+++ b/tools/setup/common/git-hooks.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+#
+# tools/common/git-hooks.sh - Installs the repository's git hooks.
+
+set -euo pipefail
+
+REPO_ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+HOOKS_SOURCE_DIR="$REPO_ROOT/tools/git/hooks"
+HOOKS_TARGET_DIR="$REPO_ROOT/.git/hooks"
+
+echo "--- Installing Git Hooks ---"
+
+if [ ! -d "$HOOKS_TARGET_DIR" ]; then
+    echo "Git hooks directory not found. Skipping hook installation."
+    exit 0
+fi
+
+for hook in "$HOOKS_SOURCE_DIR"/*; do
+    hook_name=$(basename "$hook")
+    target_hook="$HOOKS_TARGET_DIR/$hook_name"
+    echo "Installing hook: $hook_name"
+    cp "$hook" "$target_hook"
+    chmod +x "$target_hook"
+done
+
+echo "--- Git Hooks installed successfully ---"
diff --git a/tools/setup/macos.sh b/tools/setup/macos.sh
index 7efaeb5224..068c40d0e9 100755
--- a/tools/setup/macos.sh
+++ b/tools/setup/macos.sh
@@ -144,3 +144,4 @@ export PATH="$HOME/.dotnet/tools:$PATH"
 "$SETUP_DIR/common/verifiers.sh"
 "$SETUP_DIR/common/shellenv.sh"
 "$SETUP_DIR/common/profile-edit.sh"
+"$SETUP_DIR/common/git-hooks.sh"