feat(langchain_v1): on_tool_call interceptor (wip)

libs/langchain_v1/langchain/agents/middleware/__init__.py

@@ -7,6 +7,10 @@
 from .prompt_caching import AnthropicPromptCachingMiddleware
 from .summarization import SummarizationMiddleware
 from .tool_call_limit import ToolCallLimitMiddleware
+from .tool_error_handling import (
+    ErrorToMessageMiddleware,
+    RetryMiddleware,
+)
 from .tool_selection import LLMToolSelectorMiddleware
 from .types import (
     AgentMiddleware,
@@ -24,13 +28,15 @@
     "AgentState",
     # should move to langchain-anthropic if we decide to keep it
     "AnthropicPromptCachingMiddleware",
+    "ErrorToMessageMiddleware",
     "HumanInTheLoopMiddleware",
     "LLMToolSelectorMiddleware",
     "ModelFallbackMiddleware",
     "ModelRequest",
     "PIIDetectionError",
     "PIIMiddleware",
     "PlanningMiddleware",
+    "RetryMiddleware",
     "SummarizationMiddleware",
     "ToolCallLimitMiddleware",
     "after_model",