MCP servers · shortlist
MCP servers for databases
Database connectors, data platforms, filesystem bridges and the knowledge stores an agent reads from. These are the servers that decide whether your agent can see your actual data.
How this list was ordered. There is no reliable popularity signal in the source registries, so entries are ranked by how completely the record is documented — a substantial description plus a documentation, repository or base URL — and then alphabetically. 416 mcp servers in this scope clear the content bar; the top 24 are shown. A place here is not an endorsement or a paid slot.
Shortlisted entries
- 01
sunsatosolutions/Vulcanus
Generates a Git-versioned Markdown vault as project memory, then serves it over MCP. recall returns a project's capsule plus the read-next list and warns when the capsule is older than the decisions beneath it; search ranks by layer; writes are scoped — updatecapsule replaces one named section rather than rewriting the file. A doctor tool validates that every link resolves and every project is reachable, so the memory fails loudly instead of rotting. Plain Markdown, Obsidian-compatible, no database. npx @sunsato/vulcanus
Knowledge & Memory auth: None
- 02
LamantinAI/kaeru
Memory for LLM agents: a local graph where the agent itself keeps decisions, tasks, hypotheses and reasoning between sessions, and gets a summary of what is open and overdue on every return to a project. Single Rust binary with no embedding model or LLM calls inside; one daemon serves several agents at once, with an optional self-hosted cloud for teams. Works with Claude Code, Codex, Cursor, opencode and any MCP client.
Knowledge & Memory auth: None
- 03
yakuphanycl/instinct
Self-learning memory for AI coding agents. Observes tool sequences, user preferences, and recurring fixes; confidence-based promotion (hits ≥5 → mature, ≥10 → rule) so agents stop repeating mistakes without explicit instruction. SQLite-backed, project-aware, zero external deps. Works with Claude Code, Cursor, Windsurf, Goose, Codex. Published on PyPI as instinct-mcp and registered in the MCP Registry.
Knowledge & Memory auth: None
- 04
thyn-ai/telys-sdk
Official Telys MCP server — private, on-device memory & retrieval for AI assistants: 19 tools covering memory CRUD, semantic + on-device BM25 lexical search, single-key filtered queries, compaction/IVF/tuning maintenance, and a self-refreshing repo auto-indexer. Stdio; introspection needs no credentials; execution requires the one-time free telys login (device authorization). pipx install telys
Knowledge & Memory auth: None
- 05
jeremiahsay/greencalculus-mcp
Sourced greenhouse-gas emission factors and audit-traced carbon calculations (activity, embodied EN 15978, PCAF financed emissions) — every value returns with its exact source cell and data version, so answers are citable and reproducible. 13,000+ factors, 11 tools. Install: npx -y greencalculus-mcp, or connect remotely at https://mcp.greencalculus.com. Free tier, no card.
Data Platforms auth: None
- 06
Kyrzin/kybase
Self-hosted Markdown knowledge base that doubles as persistent memory for AI agents: a notes app you browse and edit (wikilinks, backlinks, graph), 18 MCP tools over Streamable HTTP with OAuth (works as a claude.ai connector) or stdio. Hybrid search (Postgres full-text + pgvector, RRF, optional reranker) with section-level reads and conflict-safe appends. npx -y kybase-mcp
Knowledge & Memory auth: OAuth
- 07
IvenKooLab/loci
Queryable second brain over your scattered notes, docs, PDFs and chat exports: hybrid retrieval (vector + BM25 fused with RRF), section-level citations with an optional claim-by-claim verification pass, and an Obsidian-style wikilink graph — all local, any OpenAI-compatible API or fully offline via Ollama. pip install loci-rag then run loci-mcp.
Knowledge & Memory auth: None
- 08
JAAvila-Of/vivac
A provenance tree for coding agents: every node records the node it was born from, so the agent can ask why the work is where it is. A session brief with the standing decisions and what not to touch, a close that refuses over open work, and decisions kept with the alternatives they rejected. Local JSON-lines file, no telemetry.
Knowledge & Memory auth: None
- 09
Yarmoluk/ckg-mcp
Compressed Knowledge Graphs (pre-structured dependency DAGs) as MCP context — agents traverse declared edges instead of inferring from text. Open CKG Benchmark (64 domains, 10,838 queries): 3.8× RAG's F1 at 11× fewer tokens, ~42× RDS, 0 fabricated edges by construction. 97 domains, 4 tools, no DB/embeddings. pip install ckg-mcp
Knowledge & Memory auth: API Key
- 10
eidetic-works/nucleus-mcp
Sovereign Agent OS — persistent memory, governance, and audit trails for AI agents. One brain for Cursor, Claude Code, Windsurf, and Gemini. Local-first .brain/ directory with engrams, hypervisor file protection, and optional remote sync. pip install nucleus-mcp or Streamable HTTP at relay.nucleusos.dev.
Knowledge & Memory auth: None
- 11
dexio-wiki/dexio
One wiki that all your agents read and write over MCP, from any machine: search, read, write, edit and move Markdown pages, with every version kept and the agent behind each change recorded. A web app shows the link graph and page history. Self-host it (AGPL-3.0) or use the hosted app.dexio.wiki.
Knowledge & Memory auth: None
- 12
Ritwikjoshi/ritwikjoshi-mcp
Official personal Model Context Protocol server for Ritwik Joshi (2x TEDx Speaker, AI entrepreneur). Exposes tools for speaker background, verified TEDx talks, keynote catalog, booking info, and media kit dispatch. Remote Streamable HTTP endpoint: https://api.ritwikjoshi.com/mcp.
Knowledge & Memory auth: None
- 13
Cartisien/engram-mcp
Persistent semantic memory for AI agents. SQLite-backed, local-first, zero config. Semantic search via Ollama embeddings (nomic-embed-text) with keyword fallback. remember, recall, history, forget, and stats tools. Works with Claude Desktop, Cursor, and any MCP client.
Knowledge & Memory auth: None
- 14
mem0ai/mem0-mcp
A Model Context Protocol server for Mem0 that helps manage coding preferences and patterns, providing tools for storing, retrieving and semantically handling code implementations, best practices and technical documentation in IDEs like Cursor and Windsurf
Knowledge & Memory auth: None
- 15
AirSaiga/Precis
Local-first data quality workbench for Excel/CSV: validate against schemas and 10 zero-code constraint types (uniqueness, ranges, foreign keys, allowed values and more), with row-level error reports. Also ships a visual desktop app, CLI and REST API.
Data Platforms auth: None
- 16
aitytech/agentkits-memory
Persistent memory for AI coding assistants with hybrid search (FTS5 + vector embeddings), session tracking, automatic context hooks, and web viewer. SQLite-based with no daemon process — works with Claude Code, Cursor, Windsurf, and any MCP client.
Knowledge & Memory auth: None
- 17
geml-spec/geml
Address Markdown and GEML documents by block instead of by line: list, get, set, add, delete, rename, revert, find and check one block, with every write re-parsed and refused if it would break the document; plus call-graph queries over a codebase.
Knowledge & Memory auth: None
- 18
papersflow-ai/papersflow-mcp
Hosted MCP server by PapersFlow for academic research with 7 specialized AI agents and 474M+ papers from Semantic Scholar and OpenAlex. Literature search, citation verification, citation graph exploration, and autonomous deep research workflows.
Knowledge & Memory auth: None
- 19
peterbeck111/knowledgelib-io
Search 1,500+ pre-verified, cited knowledge units across 16 domains. 6 tools: query, batch query, get unit, list domains, suggest topics, report issues. Confidence scores, source provenance, and freshness tracking. Free, no API key required.
Knowledge & Memory auth: API Key
- 20
AIops-tools/MySQL-AIops
Governed MySQL + MariaDB DBA operations — slow-query, lock-wait/deadlock, replication, and fragmentation RCA, plus guardrailed writes (35 tools) with unbypassable audit logging (MCP + CLI), budget/runaway guards, dry-run, and undo/rollback.
Databases auth: None
- 21
Jidoseal/jidoseal-mcp
Checks a folder of Markdown docs for missing Open Knowledge Format (OKF) frontmatter fields, locally; writes only .jidoseal/ in that folder. MCP server Apache-2.0, scan engine proprietary; no network use during a scan is a vendor claim.
Knowledge & Memory auth: None
- 22
ambermem/amber
Hosted long-term memory for AI assistants. Your assistant stores facts with its own phrasings; Amber embeds them and finds them again by meaning and by keyword. Recoverable trash, full export, one isolated database per user. [$2.99/mo]
Knowledge & Memory auth: None
- 23
kyle-visner/stellarjay
Safe write access for AI agents: an append-only business fact store where every change is kept, attributed to the agent that made it, and can be undone (undochanges). Self-host with stellarjay-mcp or use the hosted AvianSuite server.
Knowledge & Memory auth: None
- 24
elekto-com-br/elekto-mcp-sql
#⃣ - Read-only SQL Server introspection for .NET projects: schema, DDL, dependency graphs, index health and data profiling, reading connection strings from appsettings.json or web.config, and reporting which GRANTs the login lacks.
Databases auth: None
Snapshot 2026-10-19. Fields shown are what the source registry stated, not a live probe — check the linked documentation before integrating. See the methodology.