Tools · Knowledge Base QA
Best MCP servers for knowledge base QA
504 MCP servers in the Official MCP Registry do knowledge base QA. 239 can be used as a hosted endpoint, with nothing to install, and 382 publish their source code.
| # | Tool | Relevance | Connect | Code | Seen |
|---|---|---|---|---|---|
| 401 | hivemind MCP server for Obsidian vaults - AI tools with consistent canonical context. Local-first. | In description obsidian | HOSTEDLOCAL | Open | 3d ago |
| 402 | socraticode MCP server for enterprise local codebase indexing, semantic search, and code dependency graphs. | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 403 | ESG MCP Servers 31 MCP tools for ESG data extraction, PDF processing, vector search, and EU regulation analysis. | In description vector search | HOSTEDLOCAL | Open | 3d ago |
| 404 | ForgeMesh Library MCP A paid public-domain knowledge base for AI agents: full-text search, book metadata, chapters. | In description knowledge base | HOSTEDLOCAL | Open | 3d ago |
| 405 | infobroker Multi-provider research MCP server: unified web search, fact-checking, personal knowledge base. | In description knowledge base | HOSTEDLOCAL | Open | 3d ago |
| 406 | memex Local-first second brain with semantic search. Markdown notes indexed by a local ML model. | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 407 | evc-team-relay-mcp MCP server for AI agent read/write access to Obsidian vaults via EVC Team Relay. | In description obsidian | HOSTEDLOCAL | Open | 3d ago |
| 408 | america-law-graph Search 529K US statute sections. 50 states + USC + CFR. Semantic search, citation graph, MCP. | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 409 | uploadkit UploadKit MCP — 40+ upload components, route scaffolds, BYOS setup, full docs search. | In description docs search | HOSTEDLOCAL | Open | 3d ago |
| 410 | DocsAgent — Zotero MCP Server Give AI agents instant, private access to your personal knowledge base. First source: Zotero. | In description knowledge base | HOSTEDLOCAL | Open | 3d ago |
| 411 | SearchForge Free open-source web search and page reading for LLMs, AI agents, and RAG. | In description rag | HOSTEDLOCAL | Open | 3d ago |
| 412 | kbdb A searchable second brain for AI agents: ranked keyword and semantic search over your Markdown. | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 413 | FlexOrch Classify documents, extract structured fields, mask PII, export JSONL/RAG datasets for AI agents. | In description rag | HOSTEDLOCAL | Open | 3d ago |
| 414 | brain-mcp Your Obsidian vault as private, searchable memory for Claude, Cursor, Hermes and any MCP client | In description obsidian | HOSTEDLOCAL | Open | 3d ago |
| 415 | clean-markdown Any URL to clean, LLM-ready Markdown for RAG. Strips ads, nav, and boilerplate. | In description rag | HOSTEDLOCAL | Open | 3d ago |
| 416 | Apple Notes Semantic search + connection-discovery across your own Apple Notes (bridges, synthesis). | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 417 | Margins Use your Claude Pro/Max subscription on your Obsidian vault. Reads markdown, proposes writes. | In description obsidian | HOSTEDLOCAL | Open | 3d ago |
| 418 | calibre-mcp Calibre ebook library server: search, read content, curate metadata, semantic search, gated writes. | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 419 | mcp-factcheck An MCP server that validates content against MCP specification using semantic search and AI | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 420 | vectora AI assistant with RAG, web search, filesystem and memory. MCP sub-agent for Claude Code. | In description rag | HOSTEDLOCAL | Open | 3d ago |
| 421 | arxiv-mcp-server Search arXiv papers, download full text, semantic search, citation graphs, and alerts via MCP. | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 422 | psyXe MCP Server Apple Notes, Reminders, and Contacts for AI assistants. BERT semantic search. macOS. | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 423 | Qdrant MCP MCP server that wraps the Qdrant vector database API as tools. | In description vector database | HOSTEDLOCAL | Open | 3d ago |
| 424 | fusionpact-vectordb Hybrid vector + reasoning retrieval, agent memory, multi-agent orchestration, MCP server, and RAG. | In description rag | HOSTEDLOCAL | Open | 3d ago |
| 425 | vaultguard AI agents use your Obsidian secrets by name — values never reach their context. | In description obsidian | HOSTEDLOCAL | Open | 3d ago |
| 426 | mcp-pickaxe MCP server for Pickaxe API - manage AI agents, knowledge bases, users, and analytics | In description knowledge bases | HOSTEDLOCAL | Open | 3d ago |
| 427 | mcp-documentation-server Local-first document management and semantic search for AI coding agents | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 428 | openhive-mcp Search and contribute to a shared knowledge base of AI-discovered problem-solution pairs. | In description knowledge base | HOSTEDLOCAL | Open | 3d ago |
| 429 | Vault Cortex Standalone MCP server for Obsidian vaults — hybrid search, notes & files, memory, tasks, OAuth 2.1 | In description obsidian | HOSTEDLOCAL | Open | 3d ago |
| 430 | Lumen Self-hostable agentic-AI LMS: catalog, RAG tutor, FSRS reviews, AI authoring, ingest. | In description rag | HOSTEDLOCAL | Open | 3d ago |
| 431 | a2atlassian Jira & Confluence for AI agents. Pre-configured connections, compact output. | In description confluence | HOSTEDLOCAL | Open | 3d ago |
| 432 | vault-mcp-tools Complete Obsidian vault MCP server. 35 tools: notes, search, graph, tags, canvas. | In description obsidian | HOSTEDLOCAL | Open | 3d ago |
| 433 | BuyKing MCP Server Saleplaza BuyKing MCP: Semantic search for global shopping hot deals (US/JP/KR). | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 434 | llmgraph Invoke deployed LLMGraph no-code LLM workflows (chat, RAG, automations) as MCP tools. | In description rag | HOSTEDLOCAL | Open | 3d ago |
| 435 | ckg-mcp 97-domain knowledge graphs for AI agents — 4× F1 of RAG, 11× fewer tokens. MCP-native. | In description rag | HOSTEDLOCAL | Open | 3d ago |
| 436 | research-hub Research workspace for Zotero + Obsidian + NotebookLM. Search, ingest, sync, verify briefs. | In description obsidian | HOSTEDLOCAL | Open | 3d ago |
| 437 | cortex Local multi-client RAG server over the Model Context Protocol. | In description rag | HOSTEDLOCAL | Open | 3d ago |
| 438 | PageIndex MCP Reasoning-based RAG system for chatting with long PDFs. Supports local and online files. | In description rag | HOSTEDLOCAL | Open | 3d ago |
| 439 | ContextBridge MCP memory server for AI coding assistants. Windows Service, ONNX embeddings, SQLite vector search. | In description vector search | HOSTEDLOCAL | Open | 3d ago |
| 440 | SQL Server MCP (Windows) SQL Server MCP with RAG capabilities for Windows (native ODBC support) | In description rag | HOSTEDLOCAL | Open | 3d ago |
| 441 | reftrixmcp Web design analysis with 26 MCP tools: layout, motion, quality, semantic search via pgvector | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 442 | coolify 45 optimized tools for managing Coolify infrastructure, diagnostics, and docs search | In description docs search | HOSTEDLOCAL | Open | 3d ago |
| 443 | Memory Engine MCP Local-first graph memory for AI assistants with SQLite, semantic search, and MCP tools. | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 444 | Graph-Mem Persistent knowledge-graph memory for AI agents, with local semantic search. No API keys. | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 445 | arachne-mcp Arachne MCP — scraping, browser, vision, OCR, RAG, Social Research, GitHub + VRT (56 tools). | In description rag | HOSTEDLOCAL | Open | 3d ago |
| 446 | MCP Memory Graph Authority-weighted memory graph for AI agents with conflict detection and semantic search. | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 447 | sf-intelligence — Salesforce org intelligence for AI agents Offline, read-only MCP knowledge base for one Salesforce org's metadata, deps & impact. | In description knowledge base | HOSTEDLOCAL | Open | 3d ago |
| 448 | second-brain-mcp Second brain en Obsidian: notas, conceptos como nodos, resurfacing y salud del grafo. En castellano. | In description obsidian | HOSTEDLOCAL | Open | 3d ago |
| 449 | claude-memory-manager Cross-session memory for Claude Code — context capture, semantic search, recall | In description semantic search | HOSTEDLOCAL | Open | 3d ago |
| 450 | TriliumNext (trilium-mcp) Read and write a self-hosted TriliumNext knowledge base over its ETAPI. | In description knowledge base | HOSTEDLOCAL | Open | 3d ago |
FAQ
How many MCP servers are there for knowledge base QA?
Electra Index lists 504 active MCP servers for knowledge base QA from the Official MCP Registry. 239 offer a hosted endpoint and 382 publish their source code.
Is there a ready-made AI agent for knowledge base QA instead?
Yes. If you prefer a finished product to plugging tools into your own assistant, Jamie, Notion Agent and Fathom do this out of the box.
How this list is ordered: a tool comes first when the use case appears in its name rather than only in its description, then when its description covers more aspects of the use case, then when it offers a hosted endpoint, then when its source code is public, then by how recently our robot saw it in the Official MCP Registry. The match to knowledge Base QA comes from the publisher's description (keyword method), not from a test of the tool. Only active tools with a real description are listed. No tool pays to appear here.