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代码运行时
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代码执行 seam:一个能力 seam,其接口(dsh-code-runtime,ctx.codeRuntime)运行一段模型编写的程序,对接宿主提供的异步绑定,并报告程序的打印输出与返回值。代码执行是一项可选能力,不属于 agent loop(智能体循环)主干,因此其词汇定义在此,而非 core.md。后端因执行基底和源语言而异,二者都是服务上的只读描述符;worker-thread 后端与工具注册表消费方(Code Mode)在 Code Mode RFC 中定义。
源码:packages/code-runtime/code-runtime/src/types.ts
运行:请求进,结果出
CodeRunRequest 携带运行时所需的一切。按照「包(package)边界处显式优于隐式」的规则,默认值(时间预算、输出上限)来自实现的已校验配置,绝不是 run() 内部隐藏的 ??:
interface CodeRunRequest {
/**
* The program source, in the runtime's {@link ../index.ts | language}. It
* runs as the body of an async function: top-level `await` and `return`
* are available, and the completion value becomes
* {@link CodeRunResult.value}.
*/
program: string
/** Host functions exposed to the program, one global object per namespace. */
bindings: CodeBindingNamespace[]
/**
* Abort the run: the runtime stops the program (hard, even mid-loop) and
* resolves with a {@link CodeRunFailure} of kind `'abort'`. In-flight
* binding calls are the CALLER's to settle — the runtime only stops asking.
*/
signal?: AbortSignal
}
结果将错误报告为一个字段,而非 run() 的 rejection。报告失败的程序是调用方的职责,不走异常路径(与 BashExecutor.run 的 resolve-on-failure 契约一致):
interface CodeRunResult {
/**
* The program's completion value (its top-level `return`), when it ran to
* completion and the value survived the runtime's serialization boundary;
* a non-transferable value is replaced by a string rendering, and a failed
* or value-less run leaves this absent.
*/
value?: unknown
/** Text the program emitted, in order (capped by the implementation). */
logs: string[]
/** Present iff the run failed; see {@link CodeRunFailure} for the taxonomy. */
error?: CodeRunFailure
}
绑定:宿主函数作为程序全局变量
每个 CodeBindingNamespace 在程序内成为一个由异步可调用函数组成的全局对象(Code Mode 消费方传入一个:tools)。参数与返回值必须可 structured-clone(运行时可能跨序列化边界桥接调用),且运行时将绑定名视为不可信输入(__proto__ 是普通自有属性,绝不会发生原型碰撞):
interface CodeBindingNamespace {
/** The global identifier the program sees (must be a valid JS identifier). */
global: string
/** The callable members, keyed by the exact name the program calls. */
functions: Record<string, CodeBindingFunction>
}
type CodeBindingFunction = (args: unknown) => Promise<unknown>
捕获的输出与失败分类体系
日志是按发出顺序排列的纯字符串。运行时捕获程序的 console 与流输出,但通道和 console 方法的元数据不属于 seam 的一部分,因为消费方只渲染文本。实现对聚合输出设上限,并在输出内标记截断。
失败类型是正交的结果,独立报告(见 defensive-patterns):预算耗尽不是异常,中止不是超时,基底崩溃(如 OOM)也不是二者中的任何一个:
interface CodeRunFailure {
/** The failure class (see the interface doc for each kind's meaning). */
kind: 'exception' | 'timeout' | 'abort' | 'worker-exit'
/** Human-readable detail, suitable for feeding back to a model to self-correct. */
message: string
}
服务
CodeRuntime(ctx.codeRuntime,抽象服务,定义于 packages/code-runtime/code-runtime/src/index.ts)由 run(request) 加两个只读描述符组成:language(程序必须使用的语言,'typescript' 是已知值;生成语言相关展示的消费方据此切换,遇到无法展示的语言时应显式报错)和 isolation(执行基底,'worker-thread'、'process'、'container';仅为诊断标签,不构成安全承诺)。实现必须保证各次运行彼此隔离(无跨运行状态),并在 dispose(资源释放)时等待系统完全停稳:teardown 完成前,进行中的运行都已终止并等待结束。