deepseek-harness/packages/web/web-search-exa

@deepseek-ai/dsh-web-search-exa

An Exa-backed WebSearchProvider for the harness web capability seam (ctx.web). It calls Exa's POST /search endpoint with highlight contents and maps the flat results[] into the seam's normalized WebSearchResult.

This is an implementation package: it registers a provider into ctx.web, it does not own the ctx.web key and it does not register a model-facing tool (that is @deepseek-ai/dsh-tool-web). Like @deepseek-ai/dsh-llm-deepseek, it is a function/namespace plugin (inject: ['web']) that registers its backend, not a default-export service.

Config

Key	Default	Meaning
apiKey	$EXA_API_KEY	Exa API key. Empty/absent → provider status() reports missing-credential (the seam reports configured-unavailable/none).
baseURL	https://api.exa.ai	Endpoint base; /search is appended. An unparseable value makes status() report misconfigured.
searchType	auto	Retrieval mode sent as Exa's type: auto (Exa decides), keyword, or neural.
numResults	(unset)	Default result count when a request carries no maxResults. Unset sends no default. Must be a positive integer.
highlightsPerResult	1	Highlight sentences requested per result (Exa's highlightsPerUrl). Must be a positive integer.

- id: web-search-exa
  name: '@deepseek-ai/dsh-web-search-exa'
  config:
    apiKey: !!js process.env.EXA_API_KEY

Mapping

Exa returns a flat results[] and no generated answer, so content is omitted. Each result maps to a WebSearchSource: url ← url, title ← title, snippet ← the first non-empty highlights[] entry (a result with no highlight has no portable snippet and is dropped), publishedAt ← publishedDate. A request's maxResults wins over the configured numResults default and is sent as Exa's numResults for a cost/latency optimization; the final bound is enforced by the seam. Provider failures (HTTP errors, network failure, unparseable or wrong-shape bodies) surface as WebError WEB_PROVIDER_ERROR; an aborted request surfaces as WEB_ABORTED.

Model Experience

Indirectly, through dsh-tool-web, which retains this provider's maxResults-bounded URLs, titles, first highlights, and publication dates or its exact Exa search aborted, Exa search request failed: <error>, and Exa returned an unprocessable response body: <error> failures under the consumer's error wrapper while generated answers and provider-private fields remain outside context.

Known Limitations and Deferred Work

• A result with no non-blank highlight is dropped entirely — no portable snippet to map, so fewer sources than the requested count can return.
• Only searchType/numResults/highlightsPerResult are exposed — Exa's other controls (livecrawl, category, domain/date filters, full-text contents) wait on provider-neutral seam fields (seam RFC).
• Abort classification is error-shape-based — only a DOMException named AbortError maps to WEB_ABORTED; an abort carrying a custom reason (e.g. dsh-timeout's TimeoutReason) surfaces as WEB_PROVIDER_ERROR.