diff --git a/codeframe/cli/proof_commands.py b/codeframe/cli/proof_commands.py
index 4310742b..821ff78c 100644
--- a/codeframe/cli/proof_commands.py
+++ b/codeframe/cli/proof_commands.py
@@ -8,6 +8,7 @@
 from pathlib import Path
 from typing import Optional
 
+import click
 import typer
 from rich.console import Console
 from rich.table import Table
@@ -75,12 +76,14 @@ def capture(
     if not severity:
         severity = typer.prompt(
             "Severity", default="medium",
-            type=typer.Choice(["critical", "high", "medium", "low"]),
+            # click.Choice — typer has no Choice; typer.prompt delegates to
+            # click.prompt, so this constrains the interactive input (#723).
+            type=click.Choice(["critical", "high", "medium", "low"]),
         )
     if not source:
         source = typer.prompt(
             "Source", default="qa",
-            type=typer.Choice(["production", "qa", "dogfooding", "monitoring", "user_report"]),
+            type=click.Choice(["production", "qa", "dogfooding", "monitoring", "user_report"]),
         )
 
     try:
diff --git a/tests/cli/test_proof_commands.py b/tests/cli/test_proof_commands.py
index 9304d999..d2a1effb 100644
--- a/tests/cli/test_proof_commands.py
+++ b/tests/cli/test_proof_commands.py
@@ -78,6 +78,28 @@ def test_capture_creates_req_and_persists(self, ws):
         assert req.title == "Login rejects valid credentials"
         assert req.status == ReqStatus.OPEN
 
+    def test_capture_interactive_prompts_do_not_crash(self, ws):
+        """#723: severity/source were prompted with the nonexistent typer.Choice,
+        so any interactive `cf proof capture` (no --severity/--source) raised
+        AttributeError. Drive the interactive branch via stdin and assert it
+        captures cleanly."""
+        workspace, workspace_path = ws
+        result = runner.invoke(
+            app,
+            [
+                "proof", "capture", "-w", str(workspace_path),
+                "--title", "T", "--description", "D", "--where", "src/x.py",
+            ],
+            input="high\nqa\n",  # severity Choice, then source Choice
+        )
+        assert result.exit_code == 0, result.output
+        assert "REQ-0001" in result.output
+        req = ledger.get_requirement(workspace, "REQ-0001")
+        assert req is not None
+        # Both repaired Choice prompts (severity + source) took effect.
+        assert req.severity.value == "high"
+        assert req.source.value == "qa"
+
     def test_capture_second_req_increments_id(self, ws_with_req):
         """A second capture should produce REQ-0002."""
         workspace, workspace_path = ws_with_req