core[patch]: Add missing type annotations (#22756)

Add missing type annotations.

The missing type annotations will raise exceptions with pydantic 2.

libs/core/langchain_core/output_parsers/list.py

@@ -130,7 +130,7 @@ class CommaSeparatedListOutputParser(ListOutputParser):
 class NumberedListOutputParser(ListOutputParser):
     """Parse a numbered list."""
 
-    pattern = r"\d+\.\s([^\n]+)"
+    pattern: str = r"\d+\.\s([^\n]+)"
 
     def get_format_instructions(self) -> str:
         return (
@@ -154,7 +154,7 @@ class NumberedListOutputParser(ListOutputParser):
 class MarkdownListOutputParser(ListOutputParser):
     """Parse a markdown list."""
 
-    pattern = r"^\s*[-*]\s([^\n]+)$"
+    pattern: str = r"^\s*[-*]\s([^\n]+)$"
 
     def get_format_instructions(self) -> str:
         return "Your response should be a markdown list, " "eg: `- foo\n- bar\n- baz`"

libs/core/langchain_core/tracers/evaluation.py

@@ -64,7 +64,7 @@ class EvaluatorCallbackHandler(BaseTracer):
         The LangSmith project name to be organize eval chain runs under.
     """
 
-    name = "evaluator_callback_handler"
+    name: str = "evaluator_callback_handler"
 
     def __init__(
         self,

libs/core/tests/unit_tests/test_tools.py

@@ -744,8 +744,8 @@ def test_validation_error_handling_non_validation_error(
     """Test that validation errors are handled correctly."""
 
     class _RaiseNonValidationErrorTool(BaseTool):
-        name = "raise_non_validation_error_tool"
-        description = "A tool that raises a non-validation error"
+        name: str = "raise_non_validation_error_tool"
+        description: str = "A tool that raises a non-validation error"
 
         def _parse_input(
             self,
@@ -806,8 +806,8 @@ async def test_async_validation_error_handling_non_validation_error(
     """Test that validation errors are handled correctly."""
 
     class _RaiseNonValidationErrorTool(BaseTool):
-        name = "raise_non_validation_error_tool"
-        description = "A tool that raises a non-validation error"
+        name: str = "raise_non_validation_error_tool"
+        description: str = "A tool that raises a non-validation error"
 
         def _parse_input(
             self,