Update Logic When JSON Cannot Be Parsed

@@ -31,6 +31,7 @@ from .nodes import (
     ChapterGenerationNode,
     ChapterJsonParseError,
     ChapterContentError,
+    ChapterValidationError,
     DocumentLayoutNode,
     WordBudgetNode,
 )
@@ -601,11 +602,16 @@ class ReportAgent:
                             stream_callback=chunk_callback
                         )
                         break
-                    except (ChapterJsonParseError, ChapterContentError) as structured_error:
-                        error_kind = (
-                            "content_sparse" if isinstance(structured_error, ChapterContentError) else "json_parse"
-                        )
-                        readable_label = "内容密度异常" if error_kind == "content_sparse" else "JSON解析失败"
+                    except (ChapterJsonParseError, ChapterContentError, ChapterValidationError) as structured_error:
+                        if isinstance(structured_error, ChapterContentError):
+                            error_kind = "content_sparse"
+                            readable_label = "内容密度异常"
+                        elif isinstance(structured_error, ChapterValidationError):
+                            error_kind = "validation"
+                            readable_label = "结构校验失败"
+                        else:
+                            error_kind = "json_parse"
+                            readable_label = "JSON解析失败"
                         if isinstance(structured_error, ChapterContentError):
                             candidate = getattr(structured_error, "chapter_payload", None)
                             candidate_score = getattr(structured_error, "body_characters", 0) or 0
@@ -636,6 +642,10 @@ class ReportAgent:
                             'error': str(structured_error),
                             'reason': error_kind,
                         }
+                        if isinstance(structured_error, ChapterValidationError):
+                            validation_errors = getattr(structured_error, "errors", None)
+                            if validation_errors:
+                                status_payload['errors'] = validation_errors
                         if will_fallback:
                             status_payload['warning'] = 'content_sparse_fallback_pending'
                         emit('chapter_status', status_payload)

@@ -6,7 +6,12 @@ Report Engine节点处理模块。
 
 from .base_node import BaseNode, StateMutationNode
 from .template_selection_node import TemplateSelectionNode
-from .chapter_generation_node import ChapterGenerationNode, ChapterJsonParseError, ChapterContentError
+from .chapter_generation_node import (
+    ChapterGenerationNode,
+    ChapterJsonParseError,
+    ChapterContentError,
+    ChapterValidationError,
+)
 from .document_layout_node import DocumentLayoutNode
 from .word_budget_node import WordBudgetNode
 
@@ -17,6 +22,7 @@ __all__ = [
     "ChapterGenerationNode",
     "ChapterJsonParseError",
     "ChapterContentError",
+    "ChapterValidationError",
     "DocumentLayoutNode",
     "WordBudgetNode",
 ]

@@ -77,6 +77,18 @@ class ChapterContentError(ValueError):
         self.non_heading_blocks: int = int(non_heading_blocks or 0)
 
 
+class ChapterValidationError(ValueError):
+    """
+    章节结构在本地和LLM修复后仍无法通过校验时抛出。
+
+    该异常用于在Agent层触发针对单章的重试，而无需重启整本报告。
+    """
+
+    def __init__(self, message: str, errors: Optional[List[str]] | None = None):
+        super().__init__(message)
+        self.errors: List[str] = list(errors or [])
+
+
 class ChapterGenerationNode(BaseNode):
     """
     负责按章节调用LLM并校验JSON结构。
@@ -268,8 +280,9 @@ class ChapterGenerationNode(BaseNode):
         )
 
         if not valid:
-            raise ValueError(
-                f"{section.title} 章节JSON校验失败: {'; '.join(errors[:5])}"
+            raise ChapterValidationError(
+                f"{section.title} 章节JSON校验失败: {'; '.join(errors[:5])}",
+                errors=errors,
             )
         if content_error:
             raise content_error
@@ -1555,4 +1568,9 @@ class ChapterGenerationNode(BaseNode):
         raise last_exc
 
 
-__all__ = ["ChapterGenerationNode", "ChapterJsonParseError"]
+__all__ = [
+    "ChapterGenerationNode",
+    "ChapterJsonParseError",
+    "ChapterContentError",
+    "ChapterValidationError",
+]