diff --git a/.github/workflows/update-test-counts.yml b/.github/workflows/update-test-counts.yml
new file mode 100644
index 00000000..e2b77108
--- /dev/null
+++ b/.github/workflows/update-test-counts.yml
@@ -0,0 +1,58 @@
+name: Update Test Counts
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'Tests/**'
+      - 'Sources/**'
+  schedule:
+    - cron: '0 2 * * *'  # Daily at 2 AM UTC
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  update-test-counts:
+    runs-on: macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Count tests and suites
+        id: counts
+        run: |
+          TESTS=$(grep -r '@Test\b' Tests/ --include='*.swift' 2>/dev/null | wc -l | tr -d ' ')
+          SUITES=$(grep -r '@Suite\b' Tests/ --include='*.swift' 2>/dev/null | wc -l | tr -d ' ')
+
+          echo "tests=$TESTS" >> "$GITHUB_OUTPUT"
+          echo "suites=$SUITES" >> "$GITHUB_OUTPUT"
+
+          echo "Found $TESTS tests in $SUITES test suites"
+
+      - name: Update README badges
+        run: |
+          TESTS="${{ steps.counts.outputs.tests }}"
+          SUITES="${{ steps.counts.outputs.suites }}"
+
+          # Update badge: Tests-XXXX%2B_passing
+          sed -i '' "s/Tests-[0-9]*%2B_passing/Tests-${TESTS}%2B_passing/" README.md
+
+          # Update project structure line: "XXXX tests across YYYY test suites"
+          sed -i '' "s/[0-9]* tests across [0-9]* test suites/${TESTS} tests across ${SUITES} test suites/" README.md
+
+          # Update developer notes: "All XXXX tests run"
+          sed -i '' "s/All [0-9]* tests run/All ${TESTS} tests run/" README.md
+
+      - name: Commit if changed
+        run: |
+          git diff --quiet README.md && echo "No changes to README" && exit 0
+
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add README.md
+          git commit -m "chore: update test count badge to ${{ steps.counts.outputs.tests }} tests [skip ci]"
+          git push