deepseek-harness/website/zh-CN/api/harness/web.md

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# ctx.web

`WebService` — provided by `@deepseek-ai/dsh-web`.

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`.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/web/web/src/index.ts#L74)

### ctx.web.registerSearchProvider(provider)

```ts website-api
registerSearchProvider(provider: WebSearchProvider): () => void
```

Register a search provider. Throws WebError `WEB_DUPLICATE_PROVIDER` if its id is already registered for search. Returns a disposer; disposed with the calling fiber.

- `provider` — the provider; its `id` is the registry key.

**Returns** the disposer that unregisters the provider.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/web/web/src/index.ts#L103)

### ctx.web.registerFetchProvider(provider)

```ts website-api
registerFetchProvider(provider: WebFetchProvider): () => void
```

Register a fetch provider. Throws WebError `WEB_DUPLICATE_PROVIDER` if its id is already registered for fetch. Returns a disposer; disposed with the calling fiber.

- `provider` — the provider; its `id` is the registry key.

**Returns** the disposer that unregisters the provider.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/web/web/src/index.ts#L114)

### ctx.web.search(request, signal?)

```ts website-api
async search(request: WebSearchRequest, signal?: AbortSignal): Promise<WebSearchResult>
```

Run one search through the selected provider. Resolves the provider at call time with the selection rules above; throws 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.

- `request` — the query plus result-shaping options.
- `signal` — optional cancellation signal forwarded to the provider.

**Returns** the provider's results, capped to `request.maxResults`.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/web/web/src/index.ts#L140)

### ctx.web.fetch(request, signal?)

```ts website-api
async fetch(request: WebFetchRequest, signal?: AbortSignal): Promise<WebFetchResult>
```

Retrieve one URL through the selected provider. Resolves the provider at call time with the selection rules above; throws WebError when the capability cannot run. A non-2xx response is a result, not a throw.

- `request` — the URL plus retrieval options.
- `signal` — optional cancellation signal forwarded to the provider.

**Returns** the retrieval outcome; non-2xx responses resolve descriptively.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/web/web/src/index.ts#L157)