update architeture.md

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2026-08-12 16:23:22 +08:00
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The cause is a TypeScript-enforced same-process input. An active cancellation holder copies it into the runtime-only `AbortSignal.reason`; a signal grants cooperating listeners no classification authority. Durable `turn/end` retains the coarse `{ kind: 'aborted' }` outcome; recording who requested cancellation would require a separate durable event rather than overloading the terminal result.
The [event taxonomy](../architecture.md#event) owns the `agent/*` lifecycle, checkpoint, and waterfall contracts. Turn and step boundaries are durable session events rather than agent emits.
The [event taxonomy](../architecture.md#events) owns the `agent/*` lifecycle, checkpoint, and waterfall contracts. Turn and step boundaries are durable session events rather than agent emits.
## Initiating Agent
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cause 是由 TypeScript 强制约束的同进程输入。活跃的取消持有者会将它复制到仅运行时的 `AbortSignal.reason`;signal 不授予协作监听器任何分类权限。持久 `turn/end` 保留粗粒度 `{ kind: 'aborted' }` 结果;若需记录谁请求了取消,应使用单独的持久事件,而不是让终态结果承担额外含义。
[事件分类](../architecture.md#event)负责 `agent/*` 生命周期、检查点与 waterfall(瀑布式事件)约定。轮次和步骤边界是持久会话事件,而不是 agent emit。
[事件分类](../architecture.md#events)负责 `agent/*` 生命周期、检查点与 waterfall(瀑布式事件)约定。轮次和步骤边界是持久会话事件,而不是 agent emit。
<a id="initiating-agent"></a>
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## Service and provider contracts
`LlmAdapter` is the provider contract: subclass, implement `stream()`, and register one adapter instance with `ctx.llm.registerAdapter(providers, adapter)`. `GenerateOptions.provider` selects the registered adapter; `GenerateOptions.model` is passed to that adapter and need not be registered at lifecycle start. Duplicate provider routes fail atomically. Optional `providerRetryPolicy()` is captured per route with normal defaults, while `providerInfo()` and asynchronous `listModels()` feed `LlmService.listProviders()` / `listModels()` with detached selector metadata. That catalog is advisory rather than a request whitelist: the adapter remains authoritative and may accept unlisted model ids. One asynchronous `resolveModel()` query returns exact model identity plus optional correctness-sensitive context capacity, an adapter-configured `defaultMaxTokens`, and ordered model-owned reasoning ids with an optional deployment default; absent fields mean unavailable metadata or provider-owned behavior, not invalid catalog membership. The resolver receives optional cancellation and must settle promptly after abort. `LlmService.resolveModelInfo()` validates and detaches the aggregate. At the final adapter boundary, `resolveCallConfig()` materializes the output default only when `maxTokens` is absent and validates and materializes reasoning, so direct calls cannot bypass either configured behavior; direct dispatch captures one registration before awaiting that resolution. The agent loop instead uses `prepareCall()` to keep the same registration across model resolution, durable header logging, and dispatch, retain detached context metadata from that exact lookup, and report which config fields the adapter defaulted. Adapter lookup happens at the terminal continuation of the `llm/stream` waterfall, so a listener may short-circuit the call or route a mutable one-shot request before lookup. AgentLoop observes a request attempt once the outer waterfall returns a stream handle; that limited boundary does not prove a lazy terminal adapter was constructed or began provider I/O. The `block-start` / `block-end` `index` correlation and the assembler together mean an adapter only has to emit well-formed chunks — block reassembly is not each adapter's problem. The consumer surface (`ctx.llm.stream()`) and the `llm/stream` waterfall are described in [architecture.md § Content blocks and streaming](../architecture.md#model-content).
`LlmAdapter` is the provider contract: subclass, implement `stream()`, and register one adapter instance with `ctx.llm.registerAdapter(providers, adapter)`. `GenerateOptions.provider` selects the registered adapter; `GenerateOptions.model` is passed to that adapter and need not be registered at lifecycle start. Duplicate provider routes fail atomically. Optional `providerRetryPolicy()` is captured per route with normal defaults, while `providerInfo()` and asynchronous `listModels()` feed `LlmService.listProviders()` / `listModels()` with detached selector metadata. That catalog is advisory rather than a request whitelist: the adapter remains authoritative and may accept unlisted model ids. One asynchronous `resolveModel()` query returns exact model identity plus optional correctness-sensitive context capacity, an adapter-configured `defaultMaxTokens`, and ordered model-owned reasoning ids with an optional deployment default; absent fields mean unavailable metadata or provider-owned behavior, not invalid catalog membership. The resolver receives optional cancellation and must settle promptly after abort. `LlmService.resolveModelInfo()` validates and detaches the aggregate. At the final adapter boundary, `resolveCallConfig()` materializes the output default only when `maxTokens` is absent and validates and materializes reasoning, so direct calls cannot bypass either configured behavior; direct dispatch captures one registration before awaiting that resolution. The agent loop instead uses `prepareCall()` to keep the same registration across model resolution, durable header logging, and dispatch, retain detached context metadata from that exact lookup, and report which config fields the adapter defaulted. Adapter lookup happens at the terminal continuation of the `llm/stream` waterfall, so a listener may short-circuit the call or route a mutable one-shot request before lookup. AgentLoop observes a request attempt once the outer waterfall returns a stream handle; that limited boundary does not prove a lazy terminal adapter was constructed or began provider I/O. The `block-start` / `block-end` `index` correlation and the assembler together mean an adapter only has to emit well-formed chunks — block reassembly is not each adapter's problem. Where `ctx.llm.stream()` and the `llm/stream` waterfall sit in one turn is in [architecture.md](../architecture.md#turn-flow).
```ts type-equiv
/** One model call whose config and adapter registration were resolved together. */
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## 服务与提供方约定
`LlmAdapter` 是提供方约定:创建子类、实现 `stream()`,再用 `ctx.llm.registerAdapter(providers, adapter)` 注册一个适配器实例。`GenerateOptions.provider` 选择已注册适配器;`GenerateOptions.model` 会传给该适配器,无需在生命周期启动时注册。重复提供方路由会原子失败。可选的 `providerRetryPolicy()` 会按路由捕获并填入 normal 默认值,`providerInfo()` 与异步 `listModels()` 方法则为 `LlmService.listProviders()` / `listModels()` 提供分离的 selector 元数据。该目录仅供参考,不是请求白名单:适配器仍是权威,并可接受未列出的模型 id。单次异步 `resolveModel()` 查询返回确切模型身份,以及可选的对正确性敏感的上下文容量、适配器配置的 `defaultMaxTokens`、由模型持有的有序推理强度 ID 和可选的部署默认值;字段缺失表示元数据不可用或保留提供方持有的行为,而不表示目录成员关系无效。解析器会接收可选的取消信号,并且必须在信号中止后迅速完成结算。`LlmService.resolveModelInfo()` 会校验聚合结果并返回分离值。在最终适配器边界,`resolveCallConfig()` 仅在 `maxTokens` 缺失时填入输出默认值,并校验和填入推理强度,因此直接调用也无法绕过任何一项已配置行为;直接分派会在等待解析前捕获一项适配器注册。agent loop 则使用 `prepareCall()`,使模型解析、请求头持久记录和分派全程使用同一项注册,保留来自同一次查询的分离上下文元数据,并报告适配器填入的配置字段。适配器查找发生在 `llm/stream` waterfall 的终端 continuation,因此 listener 可以在查找前短路调用,或路由一个可变的一次性请求。AgentLoop 在外层 waterfall 返回流句柄时观察到一次请求尝试;这个有限边界不能证明惰性终端适配器已构造完成或开始提供方 I/O。`block-start` / `block-end` 的 `index` 关联与 assembler 共同意味着适配器只需 emit 格式正确的分片——块重组不是每个适配器各自的问题。消费方 surface`ctx.llm.stream()`与 `llm/stream` waterfall 见 [architecture.md § 内容块与流式传输](../architecture.md#model-content)。
`LlmAdapter` 是提供方约定:创建子类、实现 `stream()`,再用 `ctx.llm.registerAdapter(providers, adapter)` 注册一个适配器实例。`GenerateOptions.provider` 选择已注册适配器;`GenerateOptions.model` 会传给该适配器,无需在生命周期启动时注册。重复提供方路由会原子失败。可选的 `providerRetryPolicy()` 会按路由捕获并填入 normal 默认值,`providerInfo()` 与异步 `listModels()` 方法则为 `LlmService.listProviders()` / `listModels()` 提供分离的 selector 元数据。该目录仅供参考,不是请求白名单:适配器仍是权威,并可接受未列出的模型 id。单次异步 `resolveModel()` 查询返回确切模型身份,以及可选的对正确性敏感的上下文容量、适配器配置的 `defaultMaxTokens`、由模型持有的有序推理强度 ID 和可选的部署默认值;字段缺失表示元数据不可用或保留提供方持有的行为,而不表示目录成员关系无效。解析器会接收可选的取消信号,并且必须在信号中止后迅速完成结算。`LlmService.resolveModelInfo()` 会校验聚合结果并返回分离值。在最终适配器边界,`resolveCallConfig()` 仅在 `maxTokens` 缺失时填入输出默认值,并校验和填入推理强度,因此直接调用也无法绕过任何一项已配置行为;直接分派会在等待解析前捕获一项适配器注册。agent loop 则使用 `prepareCall()`,使模型解析、请求头持久记录和分派全程使用同一项注册,保留来自同一次查询的分离上下文元数据,并报告适配器填入的配置字段。适配器查找发生在 `llm/stream` waterfall 的终端 continuation,因此 listener 可以在查找前短路调用,或路由一个可变的一次性请求。AgentLoop 在外层 waterfall 返回流句柄时观察到一次请求尝试;这个有限边界不能证明惰性终端适配器已构造完成或开始提供方 I/O。`block-start` / `block-end` 的 `index` 关联与 assembler 共同意味着适配器只需 emit 格式正确的分片——块重组不是每个适配器各自的问题。`ctx.llm.stream()` 与 `llm/stream` waterfall 在一个轮次中的位置见 [architecture.md](../architecture.md#turn-flow)。
```ts type-equiv
/** One model call whose config and adapter registration were resolved together. */