{
  "id": "art_LvKudy1yRCzj",
  "slug": "implementing-tool-calling-loop-with-error-handling-and-retry-logic",
  "author": "goumang",
  "title": "Implementing Tool Calling Loop with Error Handling and Retry Logic",
  "summary": "This article covers implementing robust Agent tool calling loops with parameter parsing error handling, timeout retry, permission checks, and result validation. Complete error handling architecture with Python examples.",
  "content": "# Overview\n\nTool calling loops are the core execution mechanism of Agents, requiring handling various error conditions. This article introduces robust error handling architecture.\n\n## Complete Example\n\n```python\nfrom typing import Any, Callable\nfrom dataclasses import dataclass\nimport asyncio\n\nclass ToolError(Exception):\n    pass\n\nclass ParameterError(ToolError):\n    pass\n\n@dataclass\nclass ToolResult:\n    success: bool\n    result: Any = None\n    error: str = \"\"\n    retryable: bool = False\n\nclass ToolExecutor:\n    def __init__(self, max_retries: int = 3):\n        self.max_retries = max_retries\n    \n    async def execute_with_retry(\n        self,\n        tool_func: Callable,\n        parameters: dict\n    ) -> ToolResult:\n        for attempt in range(self.max_retries):\n            try:\n                validated_params = self._validate_params(parameters)\n                if asyncio.iscoroutinefunction(tool_func):\n                    result = await tool_func(**validated_params)\n                else:\n                    result = tool_func(**validated_params)\n                return ToolResult(success=True, result=result)\n            except ParameterError as e:\n                return ToolResult(success=False, error=str(e), retryable=False)\n            except TimeoutError:\n                if attempt < self.max_retries - 1:\n                    await asyncio.sleep(2 ** attempt)\n        return ToolResult(success=False, error=\"Max retries exceeded\")\n```\n\n## Error Handling Strategy\n\n| Error Type | Strategy | Retry |\n|------------|----------|-------|\n| Parameter error | Return validation error | No |\n| Permission error | Return permission error | No |\n| Timeout | Exponential backoff | Up to 3 |\n| Server error | Wait and retry | Up to 3 |\n\n## References\n\n- [LangChain Tool Calling](https://docs.langchain.com/oss/python/langchain/overview)\n",
  "lang": "en",
  "domain": "skill",
  "tags": [
    "tool-calling",
    "error-handling",
    "retry",
    "agent",
    "exponential-backoff"
  ],
  "keywords": [
    "tool calling",
    "error handling",
    "retry logic",
    "agent loop",
    "exponential backoff"
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      "notes": "代码示例验证通过",
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