feat: add agent response depth control

ai_knowledge_base_v2/apps/backend/tests/test_agent_runtime_config.py

@@ -20,7 +20,7 @@ from app.services.model_stream_service import (
     _stream_configured_model_async,
 )
 from app.services.model_service import ModelClientService, _copy_model_with_overrides, _max_output_tokens
-from app.services.rag_service import RagResult
+from app.services.rag_service import PromptService, RagResult
 
 
 def _database() -> Session:
@@ -73,6 +73,7 @@ def test_runtime_config_defaults_to_long_answer_safe_max_tokens():
         assert result["maxToken"] == 8192
         assert result["streamEnabled"] == 1
         assert result["reasoningVisible"] == 0
+        assert result["responseDepth"] == 35
         assert _max_output_tokens(model) == 8192
 
 
@@ -97,6 +98,7 @@ def test_saved_runtime_config_is_persisted_on_enabled_model():
                 maxToken=12000,
                 streamEnabled=0,
                 reasoningVisible=1,
+                responseDepth=20,
             ),
             db=db,
             current_admin=admin,
@@ -113,7 +115,9 @@ def test_saved_runtime_config_is_persisted_on_enabled_model():
         assert model.stream_enabled == 0
         assert result["streamEnabled"] == 0
         assert result["reasoningVisible"] == 1
+        assert result["responseDepth"] == 20
         assert db.query(SystemConfig).filter_by(config_key="show_model_reasoning").one().config_value == "true"
+        assert db.query(SystemConfig).filter_by(config_key="agent_response_depth").one().config_value == "20"
 
         payload = _openai_stream_payload(
             model,
@@ -191,10 +195,24 @@ def test_debug_preview_passes_conversation_history_and_replaces_saved_prompt():
     kwargs = build_result.await_args.kwargs
     assert [item.content for item in kwargs["history"]] == ["最开始的问题", "第一次回答"]
     assert kwargs["prompt_override"] == "调试主提示词"
+    assert kwargs["response_depth"] == 35
     assert result.messages == rag_result.messages
     assert result.prompt == "调试提示词渲染结果"
 
 
+def test_prompt_includes_response_depth_instruction():
+    with _database() as db:
+        db.add(SystemConfig(config_key="agent_response_depth", config_value="20"))
+        db.commit()
+
+        messages = PromptService.build_messages(db, "做功课没反应怎么办？", [])
+
+    system = messages[0]["content"]
+    assert "回答深度：20/100（精简）" in system
+    assert "不展开心理分析" in system
+    assert "回到当下、身体感受和情绪觉察" in system
+
+
 @pytest.mark.parametrize("reasoning_visible", [True, False])
 def test_agent_debug_stream_respects_reasoning_visibility(reasoning_visible):
     async def chunks():