fix(agent): enforce complete homework answers

ai_knowledge_base_v2/apps/backend/tests/test_agent_runtime_config.py

@@ -10,7 +10,7 @@ from app.models.admin import Admin
 from app.models.ai_config import ModelConfig
 from app.schemas.admin import AgentRuntimeConfigSaveRequest
 from app.services.model_stream_service import _openai_stream_payload
-from app.services.model_service import _max_output_tokens
+from app.services.model_service import ModelClientService, _max_output_tokens
 from app.services.rag_service import RagResult
 
 
@@ -99,3 +99,18 @@ def test_saved_runtime_config_is_persisted_on_enabled_model():
         assert payload["top_p"] == 0.9
         assert payload["presence_penalty"] == 0.2
         assert payload["frequency_penalty"] == 0.4
+
+
+def test_agent_debug_does_not_truncate_long_answer(monkeypatch):
+    monkeypatch.setattr(
+        "app.services.model_service._call_configured_model",
+        lambda *_args, **_kwargs: "长" * 6000,
+    )
+
+    result = ModelClientService.debug_model(
+        _model(),
+        RagResult(question="测试", knowledge_scopes=[], chunks=[], prompt="测试", allow_general_knowledge=True),
+        {"max_token": 8192},
+    )
+
+    assert len(result["answer"]) == 6000

ai_knowledge_base_v2/apps/backend/tests/test_knowledge_agent.py

@@ -21,6 +21,7 @@ from app.models.knowledge import (
 )
 from app.models.chat import ChatMessage
 from app.services.knowledge_agent_service import Candidate, KnowledgeAgentService
+from app.services.rag_service import PromptService, RetrievedChunk
 
 
 def _database() -> Session:
@@ -227,6 +228,26 @@ def test_homework_overview_keeps_all_numbered_practices_before_selection():
     assert all(item.chunk.title.startswith("练习") for item in selected)
 
 
+def test_homework_overview_prompt_requires_every_recalled_title():
+    chunks = [
+        RetrievedChunk(
+            knowledge_id=1 if index <= 6 else 2,
+            knowledge_name="《原生·上》" if index <= 6 else "《原生·下》",
+            title=f"练习{index}：作业{index}",
+            content=f"作业{index}的正式说明",
+        )
+        for index in range(1, 15)
+    ]
+
+    constraint = PromptService._list_completeness_constraint("原生里的作业都有哪些", chunks)
+
+    assert "本轮共召回 14 个正式编号练习" in constraint
+    assert "必须覆盖下面全部 14 项" in constraint
+    assert "不得新增清单外的作业" in constraint
+    assert "练习1：作业1" in constraint
+    assert "练习14：作业14" in constraint
+
+
 def test_complete_section_includes_child_headings_but_stops_at_next_peer():
     with _database() as db:
         knowledge = _add_published_knowledge(db, knowledge_id=1, name="合一课程")