diff --git a/src/cli/prisma.py b/src/cli/prisma.py
index 310f6f7..0a52f8e 100644
--- a/src/cli/prisma.py
+++ b/src/cli/prisma.py
@@ -162,6 +162,8 @@ def screen(
     stats = _hold(_go, hold=hold)
     for k, v in stats.items():
         typer.echo(f"  {k}: {v}")
+    if stats.get("errors", 0) > 0:
+        raise typer.Exit(1)
 
 
 @app.command(name="eligible")
@@ -583,6 +585,8 @@ def run_all(
                 zdb, provider, project, storage_dir=storage, limit=limit or None
             )
             typer.echo(f"   {s2}")
+            if s2.get("errors", 0) > 0:
+                raise typer.Exit(1)
 
             if not skip_fetch:
                 typer.echo("==> fetch (PDFs for non-excluded items)")
diff --git a/tests/cli/test_prisma_screen_errors.py b/tests/cli/test_prisma_screen_errors.py
new file mode 100644
index 0000000..49f9c1c
--- /dev/null
+++ b/tests/cli/test_prisma_screen_errors.py
@@ -0,0 +1,110 @@
+"""A model error during screening is printed and fails the command."""
+
+from __future__ import annotations
+
+from unittest.mock import MagicMock, patch
+
+from typer.testing import CliRunner
+
+from cli.prisma import app
+
+runner = CliRunner()
+
+_ERR = {"screened": 0, "include": 0, "exclude": 0, "uncertain": 0, "errors": 2}
+_OK = {"screened": 0, "include": 0, "exclude": 0, "uncertain": 0, "errors": 0}
+
+
+def _mock_db():
+    db = MagicMock()
+    db.__enter__ = MagicMock(return_value=db)
+    db.__exit__ = MagicMock(return_value=False)
+    return db
+
+
+def _ready(mc_db, mc_load, mc_provider):
+    mc_db.return_value = _mock_db()
+    mc_load.return_value = MagicMock()
+    mc_provider.return_value = MagicMock()
+
+
+class TestScreenErrors:
+    @patch("prisma.screen.run", return_value=_ERR)
+    @patch("prisma.llm.make_provider")
+    @patch("prisma.project.load")
+    @patch("zot.db.Db")
+    def test_screen_exits_1_when_the_model_errors(
+        self, mc_db, mc_load, mc_provider, mc_run
+    ):
+        _ready(mc_db, mc_load, mc_provider)
+        result = runner.invoke(app, ["screen", "skin-subs", "--no-hold"])
+        assert result.exit_code == 1
+        assert "errors" in result.output
+
+    @patch("prisma.screen.run", return_value=_OK)
+    @patch("prisma.llm.make_provider")
+    @patch("prisma.project.load")
+    @patch("zot.db.Db")
+    def test_screen_exits_0_when_there_are_no_errors(
+        self, mc_db, mc_load, mc_provider, mc_run
+    ):
+        _ready(mc_db, mc_load, mc_provider)
+        result = runner.invoke(app, ["screen", "skin-subs", "--no-hold"])
+        assert result.exit_code == 0
+
+    @patch("prisma.vpn.status", return_value={"status": "down"})
+    @patch("prisma.flow.text_summary", return_value="Summary: OK")
+    @patch("prisma.flow.count")
+    @patch("prisma.extract.run", return_value={"extracted": 0})
+    @patch("prisma.eligibility.run", return_value={"assessed": 0, "errors": 0})
+    @patch("prisma.fetch.run", return_value={"missed": 0, "errors": 0})
+    @patch("prisma.screen.run", return_value=_ERR)
+    @patch("prisma.llm.make_provider")
+    @patch("prisma.project.load")
+    @patch("zot.db.Db")
+    def test_run_exits_1_when_the_screen_stage_errors(
+        self,
+        mc_db,
+        mc_load,
+        mc_provider,
+        mc_screen,
+        mc_fetch,
+        mc_elig,
+        mc_extract,
+        mc_count,
+        mc_summary,
+        mc_vpn,
+    ):
+        _ready(mc_db, mc_load, mc_provider)
+        mc_count.return_value = MagicMock()
+        result = runner.invoke(app, ["run", "skin-subs", "--no-hold"])
+        assert result.exit_code == 1
+        assert "errors" in result.output
+        mc_fetch.assert_not_called()
+
+    @patch("prisma.vpn.status", return_value={"status": "down"})
+    @patch("prisma.flow.text_summary", return_value="Summary: OK")
+    @patch("prisma.flow.count")
+    @patch("prisma.extract.run", return_value={"extracted": 0})
+    @patch("prisma.eligibility.run", return_value={"assessed": 0, "errors": 0})
+    @patch("prisma.fetch.run", return_value={"missed": 0, "errors": 0})
+    @patch("prisma.screen.run", return_value=_OK)
+    @patch("prisma.llm.make_provider")
+    @patch("prisma.project.load")
+    @patch("zot.db.Db")
+    def test_run_exits_0_when_the_screen_stage_is_clean(
+        self,
+        mc_db,
+        mc_load,
+        mc_provider,
+        mc_screen,
+        mc_fetch,
+        mc_elig,
+        mc_extract,
+        mc_count,
+        mc_summary,
+        mc_vpn,
+    ):
+        _ready(mc_db, mc_load, mc_provider)
+        mc_count.return_value = MagicMock()
+        result = runner.invoke(app, ["run", "skin-subs", "--no-hold"])
+        assert result.exit_code == 0