Web 访问

Web 访问 seam 是一个能力 seam，在同一个 ctx.web 服务上横跨两项操作（search 与 fetch），并拆分到多个包：Service Definition（dsh-web，ctx.web + 提供方注册表）、Service Provider（dsh-web-search-exa、dsh-web-search-perplexity、dsh-web-search-deepseek、dsh-web-fetch-http）与 Consumer（dsh-tool-web，即 web_search/web_fetch 工具 schema）。Web 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。更换 search 提供方不会改变模型提交查询的方式，更换 fetch 提供方也不会改变模型请求 URL 的方式。

源码：packages/web/web/src/types.ts

为什么一项能力包含两项操作

搜索与抓取既不共享请求 schema，也不共享业务逻辑，但它们被有意设计为同一个 ctx.web 中间层：一个提供方选择策略的所有者、一套中止与错误词汇，以及一个面向产品的「此 harness 如何访问 Web」配置界面。代价是服务上并行的 searchX／fetchX 方法对；这种并行是有意为之，而不是遗漏了可抽取的共性。提供方注册的是能力（WebSearchProvider 或 WebFetchProvider），而非工具；面向模型的名称、schema、提示词引导与展示全部集中在唯一的消费方 dsh-tool-web 中。

搜索请求与结果

面向模型的工具参数仅为一个 query；maxResults 是消费方自有的上限（dsh-tool-web 的 searchMaxResults 配置，默认 8），通过 seam 传递并在返回时强制执行——如果提供方返回超量，seam 截断 sources[] 并设置 truncated。

/**
 * What one search-capable backend can return. The model-facing argument is just
 * a query; `maxResults` is a `dsh-tool-web`-layer bound passed through unchanged
 * and enforced on the way back by the seam (see {@link WebSearchResult}).
 */
interface WebSearchRequest {
  readonly query: string
  /**
   * Upper bound on returned sources; the seam truncates to it. Omitted = no
   * bound. `dsh-tool-web` always sets it. A provider whose API supports a
   * result-count control (Exa's `numResults`) should apply it at the request
   * layer as a cost/latency optimization; the seam enforces the bound
   * regardless.
   */
  readonly maxResults?: number
}

/**
 * Normalized search outcome. `content` is optional provider-generated answer
 * text or summary (Exa and DeepSeek return none; Perplexity returns a
 * generated answer).
 * `sources[]` is the portable citation shape. `truncated` is set by the seam
 * when it cut `sources[]` down to `maxResults`.
 */
interface WebSearchResult {
  /** Optional provider-generated answer text, search context, or summary. */
  readonly content?: string
  /** Citeable sources, already truncated to the request's `maxResults`. */
  readonly sources: readonly WebSearchSource[]
  /** True when the seam dropped sources to honor `maxResults`. */
  readonly truncated: boolean
}

/**
 * One citeable source. A source always has a URL; `title`, `snippet`, and
 * `publishedAt` are optional because not every provider returns them — forcing
 * adapters to invent them would make the seam lie (Perplexity citations may be
 * URL-only). `dsh-tool-web` renders `title ?? hostname(url)` for display.
 */
interface WebSearchSource {
  readonly url: string
  readonly title?: string
  readonly snippet?: string
  /** Publication/crawl timestamp as a provider-supplied ISO-8601 string. */
  readonly publishedAt?: string
}

抓取请求与结果

/**
 * What one fetch-capable backend is asked to retrieve. The request deliberately
 * omits timeout, format, prompt, and extraction controls: cancellation is a
 * direct execution argument, while presentation and higher-level LLM concerns
 * belong outside safe retrieval.
 */
interface WebFetchRequest {
  readonly url: string
}

HTTP 状态码是被抓取资源状态的一部分，不自动视为失败：即使一次成功的网络抓取收到 404 或 500 响应，也仍会产出一个 WebFetchResult，其中包含状态码和长度受限的已解码正文。url 是经过允许的重定向后的最终 URL。WebError 仅用于无法安全获取或表示资源的情况。

/**
 * Normalized fetch outcome. A successful network fetch of a non-2xx response is
 * a result, not an error: the status code is part of the fetched resource
 * state. {@link WebError} is reserved for failures to safely retrieve or
 * represent the resource.
 */
interface WebFetchResult {
  /** The final URL after allowed redirects (the request URL is in the request). */
  readonly url: string
  /** HTTP status code of the fetched response. */
  readonly statusCode: number
  /** Decoded body, classified by content kind. */
  readonly body: WebFetchBody
  /** True when the provider capped the decoded body. */
  readonly truncated: boolean
}

/**
 * The decoded body of a fetched resource. A CLOSED discriminated union owned by
 * `dsh-web`: the provider decodes the kind and `dsh-tool-web` renders it, so a
 * new kind is a coordinated change across known packages, not a plugin
 * extension. Consumers `switch` on `kind` ending in `default: assertNever(...)`
 * so adding a kind breaks compilation at every consumer until handled. Each arm
 * stays its own object literal even where fields coincide, so an arm can gain
 * fields the others lack.
 */
type WebFetchBody =
  | { readonly kind: 'html'; readonly content: string }
  | { readonly kind: 'text'; readonly content: string }

提供方可用性

提供方的 available(): boolean 是一个廉价的本地检查（凭证是否存在、配置是否可解析），禁止发起网络调用。它是执行时选择提供方的输入，而不是健康检查系统：search()／fetch() 会读取它来选择可用的提供方。选择失败时，调用方会收到可据以分支处理的结构化 WebError；其错误代码和消息会说明缺失的 id 或存在歧义的候选集。

选择从不依赖注册顺序、配置顺序或 HMR（热模块替换）顺序：一项能力要么有显式的提供方 id（配置 searchProvider／fetchProvider，或填充同一字段的对应环境变量），要么在恰好只有一个可用提供方注册时自动选择；如果存在多个可用提供方却未配置 id，则抛出 WEB_PROVIDER_AMBIGUOUS，而不会选用最先注册的提供方。

错误

WebError extends HarnessError（core.md 错误分类体系），带有 code: string（开放式，与其他 seam 的错误一致——LlmError、SubagentError），而非封闭联合类型：提供方可以在不修改 dsh-web 的情况下抛出自己的错误代码，消费方必须容忍未知错误代码。错误代码按所有者划分。共享的 WebRuntime 约定会抛出与 seam 无关的错误代码：WEB_PROVIDER_UNAVAILABLE、WEB_PROVIDER_CONFIGURED_MISSING、WEB_PROVIDER_CONFIGURED_UNAVAILABLE、WEB_PROVIDER_AMBIGUOUS、WEB_DUPLICATE_PROVIDER（注册时的编程错误，类似 LlmRuntime 的 DUPLICATE_ADAPTER）、WEB_ABORTED，以及 WEB_PROVIDER_ERROR（提供方自身故障经 seam 暴露时使用的兜底代码，包括 DNS、连接被拒绝、TLS 等网络或传输故障）。抓取传输层错误代码由 dsh-web-fetch-http 实现拥有，不同的抓取后端无需抛出它们：WEB_INVALID_URL、WEB_BLOCKED_URL、WEB_REDIRECT_BLOCKED、WEB_FETCH_TOO_LARGE、WEB_FETCH_TIMEOUT、WEB_UNSUPPORTED_CONTENT_TYPE。

服务

WebRuntime 注册搜索与抓取提供方，以 WEB_DUPLICATE_PROVIDER 拒绝重复 id，并在执行时以结构化的选择错误解析提供方。本地抓取后端仅接受 HTTP(S)、拒绝凭证、限制重定向次数、字节数、字符数和时间、对每一次同源重定向跳转重新进行安全校验，并解码正文；展示由工具负责。本地后端不会拦截私有网络目标；在能够触及敏感内部目标的环境中，禁止启用 web_fetch。

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.web — WebRuntime

The web access service. Registered as ctx.web (one instance per context).

Selection semantics (resolved at execution time, never order-dependent):

• A configured id that is registered and available() → that provider.
• A configured id not registered → WEB_PROVIDER_CONFIGURED_MISSING.
• A configured id registered but unavailable → WEB_PROVIDER_CONFIGURED_UNAVAILABLE.
• No id configured, exactly one registered usable provider → that provider.
• No id configured, multiple usable providers → WEB_PROVIDER_AMBIGUOUS.
• No id configured, no usable provider → WEB_PROVIDER_UNAVAILABLE.

/**
 * Register a search provider. Throws {@link WebError} `WEB_DUPLICATE_PROVIDER`
 * if its id is already registered for search. Returns a disposer; disposed
 * with the calling fiber.
 * @param provider - the provider; its `id` is the registry key.
 * @returns the disposer that unregisters the provider.
 */
registerSearchProvider(provider: WebSearchProvider): () => void

/**
 * Register a fetch provider. Throws {@link WebError} `WEB_DUPLICATE_PROVIDER`
 * if its id is already registered for fetch. Returns a disposer; disposed
 * with the calling fiber.
 * @param provider - the provider; its `id` is the registry key.
 * @returns the disposer that unregisters the provider.
 */
registerFetchProvider(provider: WebFetchProvider): () => void

/**
 * Run one search through the selected provider. Resolves the provider at call
 * time with the selection rules above; throws {@link WebError} when the
 * capability cannot run. The seam enforces `request.maxResults` on the result:
 * if the provider over-returns, `sources[]` is truncated and `truncated` set.
 * @param request - the query and optional result limit.
 * @param signal - optional cancellation signal forwarded to the provider.
 * @returns the provider's results, capped to `request.maxResults`.
 */
async search(request: WebSearchRequest, signal?: AbortSignal): Promise<WebSearchResult>

/**
 * Retrieve one URL through the selected provider. Resolves the provider at
 * call time with the selection rules above; throws {@link WebError} when the
 * capability cannot run. A non-2xx response is a result, not a throw.
 * @param request - the URL plus retrieval options.
 * @param signal - optional cancellation signal forwarded to the provider.
 * @returns the retrieval outcome; non-2xx responses resolve descriptively.
 */
async fetch(request: WebFetchRequest, signal?: AbortSignal): Promise<WebFetchResult>

Source: packages/web/web/src/index.ts:74