代码运行时
代码执行 seam 是一个能力 seam：其 Service Definition（dsh-code-runtime，ctx.codeRuntime）使用宿主提供的异步绑定运行一段模型编写的程序，并报告其打印内容与返回值。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 中。各后端的执行基底与源语言不同，这两项均为服务上的只读描述符；worker-thread Service Provider 与工具注册表 Consumer 的约定见 Code Mode 基础设计 和类型化返回约定。
源码：packages/code-runtime/code-runtime/src/types.ts
运行：请求进，结果出
CodeRunRequest 携带运行时要处理的一切内容。按照「包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 ??：
/**
* One run: the program source plus everything the runtime acts on. Per the
* explicit-over-implicit convention, defaulting (time budgets, output caps)
* is the implementation's validated config — a request carries no optional
* tuning knobs for a hidden `??` to fill in.
*/
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，而不是让 run() 返回被拒绝的 Promise。报告程序失败是调用方的职责，不走异常路径（与 ShellExecutor.run 失败时仍正常完成的约定一致）：
/**
* The outcome of one run. An error is a FIELD on a resolved result, never a
* rejection of `run()` — reporting a failed program is the caller's job, not
* an exception path.
*/
interface CodeRunResult {
/**
* The program's completion value (its top-level `return`), when it ran to
* completion and the value crossed the runtime's lossless-JSON boundary.
* Invalid or over-limit completions fail the run instead of substituting a
* rendered string; a failed or value-less run leaves this absent.
*/
value?: CodeJsonValue
/** Text the program emitted, in order, bounded only as part of the outer result. */
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 Consumer 传入一个：tools）。参数与返回值必须是无损 JSON，且跨越边界时不受 seam 层字节上限约束；运行时可以通过结构化克隆桥接它们。命名空间可以声明程序可见的错误类，而无需让运行时知道 Consumer 的名称：运行时会注入真实构造函数，并将被拒绝的调用转为该类的实例。运行时也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）：
/**
* Program-visible typed rejection for one binding namespace. The runtime
* injects a real error constructor under `name`; rejected member calls become
* its instances and expose the exact member name through
* `memberNameProperty`. Both strings are runtime data rather than knowledge
* of a particular consumer such as Code Mode.
*/
interface CodeBindingErrorClass {
/** Constructor global and resulting `Error.name`; same portable identifier rule as {@link CodeBindingNamespace.global}. */
name: string
/**
* Non-empty own property for the member name. The portable exclusion set is
* `RESERVED_ERROR_MEMBERS` plus dunder-form names (`__x__`, non-empty
* middle), enforced identically by every backend; any other name —
* identifiers or not — is accepted everywhere.
*/
memberNameProperty: string
}/**
* A named group of {@link CodeBindingFunction}s the runtime exposes to the
* program as one global object (e.g. `tools`). Function names are arbitrary
* strings — a runtime must treat names like `__proto__` or `constructor` as
* ordinary own properties (null-prototype construction), never as prototype
* collisions.
*/
interface CodeBindingNamespace {
/**
* The global identifier the program sees. Must match the LANGUAGE-PORTABLE
* identifier subset `[A-Za-z_][A-Za-z0-9_]*` and no language's reserved
* words, so the same namespace list works against every backend regardless
* of `language` — a JS-only spelling like `$tools` is rejected by design,
* not just by the Python backend. Names that satisfy the identifier rule but
* name a backend-owned slot (`RESERVED_BINDING_GLOBALS`, e.g. `console`,
* `__dsh_main__`) are also refused everywhere; see its declaration for the
* exact set and why each entry is reserved.
*/
global: string
/** The callable members, keyed by the exact name the program calls. */
functions: Record<string, CodeBindingFunction>
/** Optional program-visible typed rejection contract for this namespace. */
errorClass?: CodeBindingErrorClass
}/** A lossless JSON value transferable through the dependency-light Service Definition. */
type CodeJsonValue = null | boolean | number | string | CodeJsonValue[] | { [key: string]: CodeJsonValue }/**
* One host-side function exposed to the program as an async callable. The
* runtime bridges calls to it (possibly across a serialization boundary), so
* `args` and the resolution value MUST be lossless JSON. A runtime rejects a
* lossy or non-cloneable value with a descriptive error rather than corrupting
* the run. No seam-level byte cap applies to a binding resolution. A rejection
* of this function surfaces inside the program as a rejection of the
* corresponding call.
*/
type CodeBindingFunction = (args: unknown) => Promise<CodeJsonValue>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，因为 Consumer 只渲染文本。实现会对序列化后的外层日志数组，以及完成值或失败消息的组合载荷设置上限；固定的结果封装语法与 Consumer 展示空白不计入这份可变载荷计量。超限会显式失败，而不会在值中插入替代内容。
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：
/**
* Why a run failed. The kinds are orthogonal outcomes reported independently
* (per docs/defensive-patterns.md): a budget expiry is not an exception, an
* abort is not a timeout, and a substrate death is neither.
*
* - `'exception'` — the program threw or failed to parse/transform.
* - `'timeout'` — an implementation-owned budget expired; the message says which.
* - `'abort'` — {@link CodeRunRequest.signal} fired.
* - `'worker-exit'` — the execution substrate died without settling (e.g. OOM).
* - `'invalid-output'` — the completion value was not lossless JSON.
* - `'output-limit'` — the serialized outer logs/value/diagnostic exceeded the configured cap.
*/
interface CodeRunFailure {
/** The failure class (see the interface doc for each kind's meaning). */
kind: 'exception' | 'timeout' | 'abort' | 'worker-exit' | 'invalid-output' | 'output-limit'
/** 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，已知值为 'typescript' 与 'python'，即 dsh-tools 能呈现的那些，其中只有 'typescript' 有已发布的后端；生成语言相关展示的 Consumer 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 要等到所有进行中的运行均已终止并结算后才完成。
Cordis API
Generated from source by scripts/gen-cordis-catalog.ts (verified fresh by pnpm run verify-cordis-catalog in doc-sync; regenerate with pnpm run gen-cordis-catalog) — this section is byte-identical in both language sides of the page. Signature blocks use a ts cordis-catalog fence and keep the original source JSDoc; dispatch modes are defined in the primer, and the framework-inherited ctx API lives in cordis-api/inherited.md.
ctx.codeRuntime — CodeRuntime (abstract seam)
Registers one ctx.codeRuntime implementation. Program, budget, abort, and substrate failures resolve in CodeRunResult; only Service Definition contract misuse rejects. Implementations bridge structured-cloneable bindings, materialize each declared namespace rejection class, treat programs as hostile peers, isolate runs from one another, and terminate and await in-flight runs during disposal.
/**
* Execute one program against the request's bindings and capture what it
* emitted. See the class doc for the resolution contract (error is a result
* field; rejection means Service Definition contract misuse only).
* @param request - the program, its bindings, and the abort signal; the
* request carries everything the runtime acts on, with no hidden defaults.
* @returns the run's outcome: completion value (when transferable), the
* ordered log capture, and the failure (if any).
*/
abstract run(request: CodeRunRequest): Promise<CodeRunResult>