deepseek-harness-web-search-plugin

Built-in model search is handy, but serious research workflows demand an auditable source trail: which provider answered, at what rank, when it was accessed, and whether a fallback engine silently kicked in. deepseek-harness-web-search-plugin closes that gap by packaging Brave and Tavily into a native DeepSeek Harness MCP tool. Every result carries provider, domain, rank, access time, and an extraction hash; when one engine fails, a visible fallback notice accompanies the data rather than being quietly swallowed.

The plugin exposes three search modes: quick (Brave first, Tavily fallback) for fast lookups of docs, prices, and news; deep (Tavily first, Brave fallback) for research and extraction-heavy answers; and verify (both engines in parallel) for cross-checking critical claims. It also provides web_extract for reading a specific URL supplied by the user, provider_status for a zero-quota configuration check, and health_check for an explicit live probe of auth, quota, rate limits, and timeouts. The committed bundle is self-contained: a Git install requires no build step, no runtime npm dependencies, and the plugin never writes credentials into a Harness profile or proxies model traffic.

If you work inside the DeepSeek Harness web profile doing literature review, technical research, or any task where every citation must be verifiable, this plugin is a lightweight, transparent layer that slots in with a single Brave or Tavily API key and a Harness restart. No extra services, no background daemons, no vendor lock-in beyond the key you already hold.