diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 0efa724..10e775b 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -51,16 +51,19 @@ jobs:
       tag_name: ${{ steps.release.outputs.tag_name }}
       version: ${{ steps.release.outputs.version }}
 
-  publish-pypi-package:
-    name: Build and publish Python package to PyPI
-    runs-on: ubuntu-latest
+  validate-release:
+    name: Validate released commit
     needs: release-please
     if: needs.release-please.outputs.release_created == 'true'
-    environment:
-      name: pypi
-      url: https://pypi.org/p/copick-utils
-    permissions:
-      id-token: write # IMPORTANT: this permission is mandatory for trusted publishing
+    uses: ./.github/workflows/test.yml
+    with:
+      ref: ${{ needs.release-please.outputs.sha }}
+
+  build-release:
+    name: Build and inspect release artifacts
+    runs-on: ubuntu-latest
+    needs: [release-please, validate-release]
+    if: needs.release-please.outputs.release_created == 'true'
     steps:
       - name: Checkout released commit
         uses: actions/checkout@v7
@@ -69,14 +72,55 @@ jobs:
           fetch-depth: 0
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
         with:
-          version: "0.7.13"
+          version: "0.12.4"
           python-version: "3.12"
 
-      - name: build
-        run: |
-          uv build
+      - name: Check lockfile
+        run: uv lock --check
+
+      - name: Install inspection environment
+        run: uv sync --locked --extra test
+
+      - name: Verify Python version
+        run: >
+          uv run --no-sync python -c
+          "import sys; v = sys.version_info;
+          assert (v.major, v.minor) == (3, 12), sys.version;
+          assert v.releaselevel == 'final', sys.version;
+          print(sys.version)"
+
+      - name: Build distributions
+        run: uv build
+
+      - name: Inspect distributions
+        run: uv run --no-sync python scripts/inspect_distribution.py dist
+
+      - name: Preserve validated artifacts
+        uses: actions/upload-artifact@v7
+        with:
+          name: copick-utils-${{ needs.release-please.outputs.sha }}
+          path: dist/
+          if-no-files-found: error
+          retention-days: 7
+
+  publish-pypi-package:
+    name: Publish validated Python package to PyPI
+    runs-on: ubuntu-latest
+    needs: [release-please, build-release]
+    if: needs.release-please.outputs.release_created == 'true'
+    environment:
+      name: pypi
+      url: https://pypi.org/p/copick-utils
+    permissions:
+      id-token: write # IMPORTANT: this permission is mandatory for trusted publishing
+    steps:
+      - name: Download validated artifacts
+        uses: actions/download-artifact@v7
+        with:
+          name: copick-utils-${{ needs.release-please.outputs.sha }}
+          path: dist/
 
       - name: Publish distribution 📦 to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 5b7761b..7d3749c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,6 +1,12 @@
 name: Tests
 
 on:
+  workflow_call:
+    inputs:
+      ref:
+        description: Exact commit to validate
+        required: false
+        type: string
   push:
     branches: [main, v2.0]
     paths-ignore:
@@ -24,6 +30,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v7
+        with:
+          ref: ${{ inputs.ref || github.sha }}
 
       - name: Install uv
         uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
diff --git a/scripts/inspect_distribution.py b/scripts/inspect_distribution.py
new file mode 100644
index 0000000..5d1de7e
--- /dev/null
+++ b/scripts/inspect_distribution.py
@@ -0,0 +1,49 @@
+"""Fail release builds whose artifacts do not expose the migrated contract."""
+
+import argparse
+import tarfile
+import zipfile
+from pathlib import Path
+
+EXPECTED_ENTRY_POINTS = 32
+
+
+def inspect_distributions(dist_dir: Path) -> tuple[Path, Path]:
+    wheels = list(dist_dir.glob("*.whl"))
+    sdists = list(dist_dir.glob("*.tar.gz"))
+    if len(wheels) != 1 or len(sdists) != 1:
+        raise ValueError(f"Expected one wheel and one source distribution, found {wheels!r} and {sdists!r}")
+
+    wheel = wheels[0]
+    with zipfile.ZipFile(wheel) as archive:
+        metadata_names = [name for name in archive.namelist() if name.endswith(".dist-info/METADATA")]
+        entry_point_names = [name for name in archive.namelist() if name.endswith(".dist-info/entry_points.txt")]
+        if len(metadata_names) != 1 or len(entry_point_names) != 1:
+            raise ValueError("Wheel must contain exactly one METADATA and one entry_points.txt file")
+
+        entry_points = archive.read(entry_point_names[0]).decode()
+        command_count = sum(
+            1 for line in entry_points.splitlines() if line and not line.startswith("[") and "=" in line
+        )
+        if command_count != EXPECTED_ENTRY_POINTS:
+            raise ValueError(f"Expected {EXPECTED_ENTRY_POINTS} command entry points, found {command_count}")
+
+    sdist = sdists[0]
+    with tarfile.open(sdist, "r:gz") as archive:
+        names = archive.getnames()
+        if not any(name.endswith("/uv.lock") for name in names):
+            raise ValueError("Source distribution does not contain uv.lock")
+
+    return wheel, sdist
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("dist_dir", type=Path)
+    args = parser.parse_args()
+    wheel, sdist = inspect_distributions(args.dist_dir)
+    print(f"Validated {wheel.name} and {sdist.name}")
+
+
+if __name__ == "__main__":
+    main()