Enum WebSearchTool.Provider

Namespace

LMKit.Agents.Tools.BuiltIn.Net

Assembly

LM-Kit.NET.dll

Specifies the search provider to use with WebSearchTool.

public enum WebSearchTool.Provider

Fields

DuckDuckGo = 0

DuckDuckGo HTML search. Free, no API key required.

Suitable for local development and low-volume use only. DuckDuckGo's free HTML endpoint applies aggressive anti-bot rate limiting based on IP / User-Agent fingerprint and will return a CAPTCHA challenge page (parsed as 0 results) or HTTP 403 / 429 once it flags a client. Typical rate-limit window: a few queries per minute, then a multi-hour block per IP. Not recommended for production agent workloads.

For production, use Brave, Tavily, or Serper (all offer free tiers).

Brave = 1

Brave Search API. Requires API key. High-quality results with free tier (2000 queries/month). Get API key at: https://brave.com/search/api/

SearXNG = 2

SearXNG meta-search engine. Can be self-hosted. Aggregates results from multiple search engines. Privacy-focused with many public instances available.

Tavily = 3

Tavily AI search API. Requires API key. Optimized for AI/RAG applications with semantic search. Get API key at: https://tavily.com/

Serper = 4

Serper Google Search API. Requires API key. Provides Google search results via API. Get API key at: https://serper.dev/

Custom = 99

Custom search endpoint. Configure via BaseUrl. Use placeholders {query} and {maxResults} in URL.