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2026-08-20 19:15:33 +08:00

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Agent Note: 由 dsh-llm 拥有的提供方无关内容块词汇

Status: implemented

English | 中文

问题

harness 需要一套统一的内部消息语言,供 agent loop(智能体循环)、会话日志和所有插件共同使用。

决策

自主拥有词汇:消息是类型化内容块的数组(text、reasoning、tool-call、tool-result),其联合类型派生自可合并扩展的 ContentBlockMap,插件通过声明合并添加新的块类型。同一可合并扩展映射模式为所有「字符串化」字段提供类型(MessageSource、FinishReason、TurnTrigger、TurnEndReason)。流式输出采用原始分片协议;BlockAssembler 是唯一的共享组装实现。适配器负责转换为提供方的协议格式(wire format)——映射成本留在适配器中,正是它该在的地方。

会话内上下文注入(context/message)和轮次中途 steering(中途引导)最初渲染为带标签的 user-role 信封(system-reminder 模式),而非引入新角色,因此适配器无需承担额外负担。如今两者都投影为无包装的普通用户内容;见注入内容信封 Agent Note。实际适配器验证已确认此渲染方式符合当前 DeepSeek 的行为;如果未来某提供方出现不兼容,应在该适配器内处理,而非引入新的规范角色。

曾考虑的替代方案

  • 镜像 DeepSeek/OpenAI chat-completions 结构:对第一个提供方零映射成本,但对富内容(推理、结构化块形式的工具结果)处理不便。
  • 原样采用 Anthropic Messages 块结构:经过实战检验,但规范类型将镜像一个 harness 并非首要对接的第三方 API。

后果

  • 推理(reasoning)在核心层有了归属,无需依赖提供方特有的结构。
  • 多模态块只有在适配器、UI 和上下文压缩(context compaction)三方协同支持后才会回归;见 drop-image Agent Note。
  • 缓存提示与 assistant prefill 在有实际适配器能兑现之前保持缺席;见无生产者的词汇变体与无端到端可用路径的请求旋钮 Agent Note。
  • 每个适配器都需承担翻译成本;首批真实适配器已验证了流式输出协议,新适配器应继续在适配器本地测试中验证其提供方特有的映射。
  • 跨包边界的 ID 使用品牌类型(CallId、agent 与会话共享的 SessionId)——零运行时开销的名义类型。