"Guidance for Understanding Large Codebases and Learning Their Architecture" matching MCP connectors:

For queries a model can't confidently place: resolves or declines. Built to decline, not guess.

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

MCP server for German & EU law. Verified, citable legal context for any LLM. Daily updates from official sources, hosted in Germany

AI-first file sharing and collaboration. 251 tools give agents a full workspace: file storage, branded shares, comments, workflows, and built-in RAG. 50GB free, no credit card.

Durable, versioned memory for AI assistants. Remote memory needs a Pastepile subscription.

**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

Collaborative, cache-first web search for agents — cited answers from a shared live-web pool.

The first low-latency wire service purpose-built for AI agents. Ingests 54+ public APIs and 71k RSS feeds across 232 countries, outputs CWF (Cognitive Wire Format) – 80% shorter than JSON, sub-second WebSocket delivery. 9 MCP tools: get_latest_signals, search_signals, get_fused_signal, scope_signals, get_facet_manifest, list_facets, get_related_signals, list_data_sources, get_billing_profile. 26 citable fusion products with verifiable formulas – no black-box scores.

Persistent semantic memory for AI agents: store and recall text by meaning (RAG). x402

LLM-ready web search + instant answers + URL-to-clean-text fetch for agents and RAG.

Persistent project context for xAI Grok. IANA-registered .faf format.

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

Cross-vendor AI memory over MCP. One semantic store, readable and writeable from every MCP client.

1 Google Search endpoints. Pay per call in USDC via x402.

Document-to-Markdown MCP server — convert PDF, Office and HTML into LLM-ready Markdown.

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

Human-authored personal context before AI guidance, built through private structured reflection.

Apple Developer Documentation with Semantic Search, RAG, and AI reranking for MCP clients

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

Disposable private vector search + semantic RAG for AI agents. x402 pay-per-call, no account.