feat(fncall_agent): 增强工具调用的健壮性和用户体验 #688
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Enhanced robustness and user experience of tool calling in FnCallAgent ### 主要改进内容 / Key Improvements: 1. 工具调用参数处理增强 / Enhanced tool call parameter handling: - 确保传递给MCP工具的参数始终为JSON字符串格式 - 添加参数类型检查和自动转换机制 - 防止因参数类型不匹配导致的TypeError异常 2. 工具调用安全防护 / Tool call safety protections: - 添加工具名白名单验证，防止调用未注册的工具 - 实现function_id去重机制，避免重复调用同一工具 - 添加function_id缺失时的自增ID生成机制 3. 异常处理优化 / Exception handling optimization: - 统一工具异常处理，将异常对象转换为格式化字符串 - 添加工具返回值类型检查和自动转换 - 防止异常对象直接传递到消息内容中 4. 调用配额和限制控制 / Call quota and limit control: - 添加单轮工具调用数量限制(MAX_TOOL_CALLS_PER_TURN) - 实现配额用尽时的友好提示消息 - 防止模型在单轮中触发过多工具调用 5. JSON参数完整性校验 / JSON parameter integrity validation: - 仅在参数是完整可解析的JSON时才触发工具调用 - 避免阶梯式调用问题 - 等待流式输出拼接完成后再执行工具调用 6. 空值安全处理 / Null safety handling: - 对out.extra字段进行空值兜底处理 - 避免NoneType.get()导致的AttributeError异常 这些改进显著提高了FnCallAgent在各种边界情况下的稳定性和可靠性， 特别是在与MCP工具和llama-box后端配合使用时的表现。 These improvements significantly enhance the stability and reliability of FnCallAgent in various edge cases, especially when working with MCP tools and llama-box backend.
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Enhanced robustness and user experience of tool calling in FnCallAgent
主要改进内容 / Key Improvements:
工具调用参数处理增强 / Enhanced tool call parameter handling:
工具调用安全防护 / Tool call safety protections:
异常处理优化 / Exception handling optimization:
调用配额和限制控制 / Call quota and limit control:
JSON参数完整性校验 / JSON parameter integrity validation:
空值安全处理 / Null safety handling:
这些改进显著提高了FnCallAgent在各种边界情况下的稳定性和可靠性，
特别是在与MCP工具和llama-box后端配合使用时的表现。
These improvements significantly enhance the stability and reliability of FnCallAgent in various edge cases, especially when working with MCP tools and llama-box backend.