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

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A Perplexity-backed WebSearchProvider for the harness web capability seam (ctx.web). It calls Perplexity's OpenAI-compatible POST /chat/completions endpoint and maps the generated answer plus citations into the seam's normalized WebSearchResult.

This is an implementation package: it registers a provider into ctx.web, it does not own the key and it does not register a model-facing tool. Like @deepseek-ai/dsh-llm-deepseek, it is a function/namespace plugin (inject: ['web']). The OpenAI-compatible wire shape is a provider-private detail — it does not make this provider depend on ctx.llm.

Config

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

Mapping

content ← choices[0].message.content (the generated answer). sources[] prefers the structured search_results[] (url, title, snippet, publishedAt ← date), falling back to the URL-only citations[] array only when search_results is absent — those sources carry just a url, which is why title/snippet/publishedAt are optional on the seam. Provider failures surface as WebError WEB_PROVIDER_ERROR; an aborted request surfaces as WEB_ABORTED. HTTP redirects are rejected before the Location target is contacted and surface as WEB_PROVIDER_ERROR. Perplexity has no result-count control, so maxResults is enforced by the seam (truncating sources[] and setting truncated).

Model Experience

Auxiliary Perplexity request

What the model sees

A separate Perplexity model receives <query> verbatim as its sole user message through the chat-completions endpoint. This request is not part of the conversation model's context.

Token effect

Separate provider tokens are incurred per search; maxTokens caps the generated answer.

KV Cache effect

Independent of the conversation request cache. An identical query under the same model route may reuse provider cache; a changed query or route establishes a different prefix.

Conversation tool result, indirectly

What the model sees

Through dsh-tool-web, the conversation model sees the generated answer plus structured result metadata or URL-only citations. This provider's exact failures are Perplexity search aborted, Perplexity search request failed: <error>, and Perplexity returned an unprocessable response body: <error>; HTTP failures preserve the provider message. The consumer owns the error wrapper.

Token effect

Zero direct conversation tokens from registration. Answer and source tokens are data-dependent, source count is service-bounded, and the retained result or error is resent until compaction.

KV Cache effect

Append-only; newly visible content follows the reusable request prefix and does not invalidate existing KV-cache entries.

Known Limitations and Deferred Work

• Citation-fallback sources are URL-only — when Perplexity omits structured search_results[], sources carry no title/snippet/publishedAt, so the tool renders bare hostname labels.
• Over-returned sources still cost tokens and latency — with no result-count control on the wire, maxResults is enforced only post-hoc by seam truncation.
• Only model/maxTokens/searchRecency are exposed — Perplexity's other search controls (domain filters, web_search_options context size, images) wait on provider-neutral Service Definition fields (seam Agent Note).
• 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.