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Search and retrieval (RAG) MCP servers

1,793 servers

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  1. Context Engine io.github.melonelish/context-engine

    Compress logs, retrieval chunks, and code context into structured LLM-ready signal.

    Version check not run yet

    Monitoring and observability Official MCP Registry Local

  2. Memtomem io.github.memtomem/memtomem

    Markdown-first long-term memory for AI agents. Hybrid BM25 + vector search, runs locally.

    Version check not run yet

    Memory and context Official MCP Registry Local

  3. Crg io.github.n24q02m/crg

    Token-efficient code review knowledge graph: semantic search and call-graph resolution.

    Version check not run yet

    Developer tools Official MCP Registry Local

  4. Scholar RAG MCP io.github.notwhiteblank/scholar-rag-mcp

    Academic paper knowledge-base MCP server: PDF ingest, vector search with reranking, KB management.

    Version check not run yet

    Search and retrieval (RAG) Official MCP Registry · PyPI Local

  5. VectorCache Semantic Vector Cache io.github.pgalyen1987/vectorcache

    x402-gated semantic vector cache for agent swarms: Redis-backed similarity lookup. Paid in USDC.

    Version check not run yet

    Search and retrieval (RAG) Official MCP Registry Local

  6. Pensieve io.github.praveen-ilangovan/pensieve

    Manually-triggered, self-organising personal memory for AI agents; SQLite, no vector DB.

    Version check not run yet

    Databases Official MCP Registry · PyPI Local

  7. Llmstxt Doc Search io.github.praveenc/llmstxt-doc-search

    BM25 search over llms.txt doc indexes (Strands, Kiro, AWS); sources addable at runtime.

    Version check not run yet

    Cloud platforms Official MCP Registry Local

  8. DocPull io.github.raintree-technology/docpull

    Sync public web sources into cited context packs for AI agents, RAG, and MCP clients.

    Version check not run yet

    Search and retrieval (RAG) Official MCP Registry Local

  9. Docsonar io.github.ribhav-jain/docsonar

    Local document search over your folders: hybrid keyword+semantic, fully offline, read-only

    Version check not run yet

    Files and storage Official MCP Registry Local

  10. RTFM io.github.roomi-fields/rtfm

    Local retrieval for AI agents: index code, docs, PDFs, data in SQLite; 24 parsers, served via MCP.

    Version check not run yet

    Databases Official MCP Registry Local

  11. trelix io.github.sairam0424/trelix

    Semantic code search for AI agents — hybrid BM25+vector, call-graph, 20+ languages.

    Version check not run yet

    Search and retrieval (RAG) Official MCP Registry · PyPI Local

  12. amu-pgvector io.github.sangaraju1988/amu-pgvector

    Lineage-gated agent memory tools on Postgres + pgvector, enforced by row-level security.

    Version check not run yet

    Search and retrieval (RAG) Official MCP Registry Local

  13. Vexor io.github.scarletkc/vexor

    A semantic search engine for files and code.

    Version check not run yet

    Files and storage Official MCP Registry Local

  14. SeekLink io.github.simonsysun/seeklink

    Local read-only semantic search for Markdown vaults through MCP.

    Version check not run yet

    Office documents and spreadsheets Official MCP Registry Local

  15. M3 Memory io.github.skynetcmd/m3-memory

    Local-first, cloud-friendly memory — 100+ tools, 99.2% LongMemEval-S retrieval@8, hybrid search.

    Version check not run yet

    Memory and context Official MCP Registry Local

  16. Synapbus io.github.synapbus/synapbus

    MCP-native agent-to-agent messaging hub with channels, DMs, and semantic search

    Not checked yet

    Communication and chat Official MCP Registry · Go modules

  17. Pulse8 Ai Cortex Knowledge Vault io.github.synpulse8-opensource/pulse8-ai-cortex-knowledge-vault

    Agent-native knowledge OS on Markdown: typed graph, hybrid search, and compiler over MCP.

    Version check not run yet

    Developer tools Official MCP Registry Local

  18. Telys — on-device memory io.github.thyn-ai/telys

    Private on-device memory & retrieval for AI assistants — offline vector + lexical search.

    Version check not run yet

    Memory and context Official MCP Registry Local

  19. Mem io.github.turbyho/mem-context

    Temporal memory MCP server with LanceDB vector search, weight-decay scoring, and LLM consolidation

    Version check not run yet

    Search and retrieval (RAG) Official MCP Registry Local

  20. Vouch io.github.vouchdev/vouch

    Git-native, review-gated knowledge base for LLM agents. Cited retrieval, audited writes.

    Version check not run yet

    Git and code hosting Official MCP Registry Local

  21. CrawlEyes MCP Server io.github.waiky-github/CrawlEyes

    Web scraping & search for AI agents: extract, SearXNG search, rerank, robots compliance. No API key.

    Version check not run yet

    Web search and scraping Official MCP Registry Local

  22. Contextweaver io.github.wchiway/contextweaver

    Semantic code retrieval engine with hybrid search, context expansion, and 40+ language support.

    Version check not run yet

    Search and retrieval (RAG) Official MCP Registry Local

  23. Magpie Search io.github.xfloukiex-lab/magpie-search

    Federated local-first search across transcripts, files, KG, vectors and the web for AI agents.

    Version check not run yet

    Files and storage Official MCP Registry Local

  24. Web2MD io.github.kanavsingla28/web2md-mcp

    Turn any web page into clean Markdown, text or token-bounded RAG chunks (via RapidAPI).

    Version check not run yet

    Web search and scraping Official MCP Registry · npm Local MIT

  25. MGI-Mind io.github.madgodinc/mgi-mind

    Local memory server for AI agents: hybrid search, a fact graph and a hash-chained audit log.

    Version check not run yet

    Security Official MCP Registry · npm Local APACHE-2.0

  26. synapse-code-mcp io.github.juanmidev1/synapse-code-mcp

    MCP server for code intelligence — semantic context, dependency graphs, and compressed symbol indexes for TypeScript/JavaScript, plus git-aware diffs and fast search. Zero external dependencies: no ve

    Version check not run yet

    Developer tools npm Local 99 a week MIT

  27. brain-rag io.github.dasportillo/brain-rag

    Local, private RAG second brain over your Claude Code & Codex transcripts, served back to both agents as an MCP server.

    Version check not run yet

    Memory and context npm Local 95 a week MIT

  28. Attestor io.github.bolnet/attestor

    Self-hosted memory for agent teams. Bi-temporal replay, deterministic retrieval, audit log.

    Version check not run yet

    Security Official MCP Registry Local

  29. @proofofwork-agency/reporecall io.github.proofofwork-agency/reporecall-7cfv0n

    Local-first, auto-injecting, self-aware-about-staleness context + memory layer for coding agents (Claude Code, Codex, MCP). Trust contract, hooks-first, hybrid retrieval + compression, zero infra.

    Version check not run yet

    Memory and context npm Local 86 a week MIT

  30. @jonyoder/code-index-mcp io.github.posit-dev/code-index-mcp

    MCP server for semantic code search using vector embeddings

    Version check not run yet

    Search and retrieval (RAG) npm Local 193 a week MIT

  31. Palace io.github.AncientiCe/palace-rs

    Local-first memory for coding agents — MCP server, single SQLite file, local embeddings

    Version check not run yet

    Search and retrieval (RAG) Official MCP Registry Local

  32. Pipe (SPR) MCP Server io.github.MachuraHarry/pipe

    AI-native runtime with built-in MCP server. 232 builtins, AI pipelines, RAG, single ~8 MB binary.

    Version check not run yet

    DevOps and infrastructure Official MCP Registry · GitHub MCP Registry Local

  33. Unstructured Transform io.unstructured/transform

    Turn documents into structured, AI-ready data by parsing, enriching, chunking, and embedding.

    100% up · 30 days

    Office documents and spreadsheets Official MCP Registry · GitHub MCP Registry Remote

  34. @eristack/ai-workflow io.github.eristack/business-libs-ai-workflow

    Local-first AI workflow for Eristack projects: MCP server, FTS+vector index, backlog/sprint/ADR artifacts — low-token agent tools that do not replace existing editors or Intent

    Version check not run yet

    Project management npm Local 76 a week MIT

  35. @smith-and-web/obsidian-mcp-server io.github.smith-and-web/obsidian-mcp-server

    A Model Context Protocol (MCP) server for Obsidian vault management via SSE transport, with optional pgvector-backed semantic search

    Version check not run yet

    Docs and knowledge bases npm Local 74 a week MIT

  36. sciverse-mcp-server io.github.opendatalab/sciverse-agent-tools-mcp

    Sciverse MCP server — exposes academic paper retrieval (search_papers / semantic_search / read_content) to MCP-compatible coding agents (Claude Code, Cursor, Codex CLI, Windsurf, ...).

    Version check not run yet

    Science and research npm Local 72 a week APACHE-2.0

  37. @at-studio/aqmd io.github.tobi/qmd

    Query Markup Documents - On-device hybrid search for markdown files with BM25, vector search, and LLM reranking

    Version check not run yet

    Search and retrieval (RAG) npm Local 4 a week MIT

  38. org-qmd io.github.tobi/qmd-jrfnmt

    Query Markup Documents - On-device hybrid search for Org-mode and Markdown files with BM25, vector search, and LLM reranking

    Version check not run yet

    Search and retrieval (RAG) npm Local 2 a week MIT

  39. vidilearn io.github.alfo-tech-lab/vidilearn

    AI-native universal knowledge ingestion and semantic retrieval engine with hybrid BM25+vector search, MCP server integration, and offline embeddings

    Version check not run yet

    Search and retrieval (RAG) npm Local 19 a week MIT

  40. @iflow-mcp/flowing-abyss-obsidian-hybrid-search io.github.flowing-abyss/obsidian-hybrid-search-mb0c3p

    An [MCP server](https://modelcontextprotocol.io) and CLI tool that makes your Obsidian vault queryable by AI assistants. Indexes notes into SQLite with FTS5 full-text search, trigram fuzzy matching, a

    Version check not run yet

    Docs and knowledge bases npm Local MIT

  41. tea-rags io.github.artk0de/tearags-mcp-pxw2s0

    MCP server for semantic search using local Qdrant and Ollama (default) with support for OpenAI, Cohere, and Voyage AI

    Version check not run yet

    Search and retrieval (RAG) npm Local 67 a week MIT

  42. @aeriondyseti/vector-memory-mcp io.github.aeriondyseti/vector-memory-mcp

    A zero-configuration RAG memory server for MCP clients

    Version check not run yet

    Memory and context npm Local 64 a week MIT

  43. Hebbian Vault io.github.onetrueclaude-creator/hebbian-vault

    Usage-adaptive Obsidian vault search: Hebbian + PageRank + BM25 hybrid ranking.

    Version check not run yet

    Docs and knowledge bases Official MCP Registry Local

  44. Longmem io.github.marerem/longmem

    Persistent cross-project memory for Cursor and Claude Code using local semantic search.

    Version check not run yet

    Memory and context Official MCP Registry Local

  45. iflow-mcp_chroma-core_chroma-mcp io.github.chroma-core/chroma-mcp-5baggz

    Chroma MCP Server - Vector Database Integration for LLM Applications

    Version check not run yet

    Search and retrieval (RAG) PyPI Local APACHE-2.0

  46. mcp-memory-service-lite io.github.doobidoo/mcp-memory-service-c8y9yh

    Lightweight semantic memory service with ONNX embeddings - no PyTorch required. 80% smaller install size. REST API + MCP transport.

    Version check not run yet

    Memory and context PyPI Local APACHE-2.0

  47. shutup-mcp io.github.hjs-spec/shutup-mcp

    Experimental MCP proxy for filtering large tool lists using hybrid semantic and keyword retrieval

    Version check not run yet

    Search and retrieval (RAG) PyPI Local MIT

  48. @fozikio/cortex-engine io.github.fozikio/cortex-engine

    Portable cognitive engine for AI agents — storage, embeddings, memory, FSRS, and MCP server

    Version check not run yet

    Search and retrieval (RAG) npm Local 57 a week MIT