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

Key	Default	Meaning
`apiKey`	`$PERPLEXITY_API_KEY`	Perplexity API key. Empty/absent → provider `status()` reports `missing-credential`.
`baseURL`	`https://api.perplexity.ai`	Endpoint base; `/chat/completions` is appended. An unparseable value makes `status()` report `misconfigured`.
`model`	`sonar`	Search model name.
`maxTokens`	`1024`	Upper bound on generated answer tokens (`max_tokens`). Must be a positive integer.
`searchRecency`	(unset)	Recency window sent as `search_recency_filter`: `day`, `week`, `month`, or `year`. Unset sends no filter.

- 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. Perplexity has no result-count control, so maxResults is enforced by the seam (truncating sources[] and setting truncated).