diff --git a/src/clean_agent_preview.py b/src/clean_agent_preview.py
index a645a7f23..47b443ac4 100644
--- a/src/clean_agent_preview.py
+++ b/src/clean_agent_preview.py
@@ -184,7 +184,8 @@ def search_tool_choice_request(request):
 
 def provider_compatible_tool_choice_request(request, model):
     """Keep tools but avoid forced choice unsupported by thinking providers."""
-    if canonical(model) == 'deepseek-flash' and 'tool_choice' in request:
+    model_name = canonical(str(model or '')).casefold()
+    if model_name.startswith('deepseek') and 'tool_choice' in request:
         compatible = dict(request)
         choice = compatible.get('tool_choice')
         selected_name = (
@@ -200,6 +201,23 @@ def provider_compatible_tool_choice_request(request, model):
                 compatible['tools'] = selected
         compatible.pop('tool_choice', None)
         return compatible
+    if (
+        request.get('tool_choice') == 'required'
+        and len(request.get('tools') or []) == 1
+        and ('qwen' in model_name or model_name.startswith('odysseus-'))
+    ):
+        # Raw-policy capture accepts a named tool constraint (and records that
+        # turn as excluded from policy loss), but deliberately rejects the
+        # distribution-wide ``required`` mode. Search recovery narrows the
+        # schema to one tool before reaching this boundary, so preserving that
+        # exact name has the same runtime intent without a transport failure.
+        compatible = dict(request)
+        name = request['tools'][0]['function']['name']
+        compatible['tool_choice'] = {
+            'type': 'function',
+            'function': {'name': name},
+        }
+        return compatible
     return request
 
 
diff --git a/tests/test_clean_agent_preview.py b/tests/test_clean_agent_preview.py
index ad58af1d4..d2b0defa0 100644
--- a/tests/test_clean_agent_preview.py
+++ b/tests/test_clean_agent_preview.py
@@ -114,6 +114,29 @@ def test_deepseek_flash_keeps_tools_but_drops_unsupported_forced_choice():
     assert provider_compatible_tool_choice_request(request, 'qwen3.5-9b') is request
 
 
+def test_deepseek_v4_flash_drops_named_choice_for_thinking_mode():
+    request = {
+        'tools': [{'type': 'function', 'function': {'name': 'write_file'}}],
+        'tool_choice': {'type': 'function', 'function': {'name': 'write_file'}},
+    }
+    compatible = provider_compatible_tool_choice_request(request, 'deepseek-v4-flash')
+    assert [tool['function']['name'] for tool in compatible['tools']] == ['write_file']
+    assert 'tool_choice' not in compatible
+
+
+def test_qwen_capture_converts_single_required_tool_to_named_constraint():
+    request = {
+        'tools': [{'type': 'function', 'function': {'name': 'web_search'}}],
+        'tool_choice': 'required',
+    }
+    compatible = provider_compatible_tool_choice_request(
+        request, 'odysseus-qwen3.5-tools-pre-heretic'
+    )
+    assert compatible['tool_choice'] == {
+        'type': 'function', 'function': {'name': 'web_search'},
+    }
+
+
 def test_private_browser_observations_do_not_advance_page_revision():
     assert private_browser_state_transition({'action': 'snapshot'}, 'https://example.org') == (
         False, 'https://example.org')