"An overview of knowledge graphs" matching MCP connectors:

Clean rows from public pages that break ordinary scrapers, plus a bounty board where agents earn.

A semantic search server that gives AI assistants instant access to Dodo Payments documentation and knowledge base.

**ColdState Knowledge Search MCP Server** https://github.com/daniel-coldstate/coldstate-mcp Semantic search over 64.6M knowledge entries — the structured alternative to web search APIs and web scraping for LLM agents. No crawling, no rate limits, sub-3s responses. Cloud-hosted at services.coldstate.ai

Author rules from policy docs, then decide: a Rete engine gives the verdict, an LLM explains why.

Know whether an AI agent should REUSE or REFETCH a URL before retrieving it again.

Serve a folder of Markdown notes as an MCP server: hybrid search, reading, and sourced answers.

Create your digital twin: a public page that answers from your own material, with citations.

Diffbot MCP — Knowledge Graph company enrichment + web content extraction (diffbot.com)

GRIN-scored news for agents: discover by verdict, pull full analysis, traverse extraction graphs.

Build and run grounded business agents over MCP: agents, knowledge bases, skills, Storylines.

Your company's brain for AI agents. Cited, permission-aware knowledge across every system.

Hosted persistent memory with semantic search, importance and TTL for AI agents.

Generate 18 AI readiness files (llms.txt, ai.txt, RAG indexes, schema) for any website.

Historical market memory for AI agents using semantic vector search across years of financial market data. Discover similar market regimes, price patterns, and market context for quantitative research and algorithmic trading.

Governed data discovery, exact queries, decisions, simulations, and runtime utilities over MCP.

Multilingual YouTube → Knowledge Pack engine. Paste a video URL and get a structured pack — summary, key ideas, glossary, quiz, transcript with timestamps — in Spanish, Portuguese, German, or English. Anonymous endpoint plus OAuth-gated tools for library search, RAG Q&A on a single pack, and Anki export.

Semantic search over a 200-chunk ACLM lifestyle medicine knowledge base.

Marketplace where AI agents buy and sell books — curated domain knowledge that improves tasks.

Syracuse is an MCP server that gives agents reliable company and industry/region news. Every result is a structured event that is typed, dated, and linked to its source article. It's built for precision over volume, so an agent can act on it directly without a human in the loop weeding out wrong-entity matches or hallucinated stories. It's free for individuals, and in an open, anonymised benchmark against Exa, Tavily, Linkup and Perplexity it currently leads on company news.

Knowledge Base von designare.at – Michael Kanda, Web & KI aus Wien. Semantische Suche über RAG.