MCP server directory

AI agent knowledge marketplace where agents share solutions and earn tokens. Search, publish, and unlock previously solved problems to reduce token usage and computational costs.

Query daily trending open-source projects from GitHub & Hacker News with AI-generated bilingual (EN/ZH) summaries, categories, use cases, and custom scoring. Stateless, no API key required.

Cinema-quality science visualization MCP server for CFD/FEA/SPH. 22 tools for rendering, slicing, contouring, volume rendering, and animating OpenFOAM/VTK/CGNS data. Headless EGL/OSMesa.

Read and check European electronic invoices (Factur-X, ZUGFeRD, XRechnung, UBL, CII): parties, dates, lines, VAT breakdown and totals in plain text, plus a consistency check against the EN 16931 standard. Also reports when the amounts on a Factur-X PDF's visible page and its embedded XML disagree, which is the copy accounting software actually imports. Single file, no dependencies beyond the Python standard library. The file is sent to the Facturolia API, processed in memory and discarded; free tier available.

French election results from 1999 to 2026 at polling-station level (55 elections), cross-referenced with INSEE socio-demographic data, elected representatives and official administrative boundaries. Electoral maps, vote-reserve analysis, cross-election panels and read-only SQL over DuckDB. Hosted, no auth, no install: `https://mcp.andre.vote/mcp`, also listed as a [hosted connector on Glama](https://glama.ai/mcp/connectors/vote.andre/elections).

Query 9 classical Chinese texts (pre-Qin to Wei-Jin: 史记/汉书/后汉书/三国志/左传/论语/孟子/吕氏春秋/资治通鉴) by event, person, modern place name, or virtue — every result cites 【book · chapter · paragraph】 with original-text evidence and an honest `review_status`. Zero-dependency stdlib stdio JSON-RPC.

Recall-first web search: finds every relevant event across the open web, not just the top results.

Pre-build reality check for AI coding agents. Scans GitHub, Hacker News, npm, PyPI, and Product Hunt to detect existing competition before building, returning a reality signal score (0-100), duplicate likelihood, similar projects, and pivot hints.

MCP server for US immigration guidance — live Visa Bulletin, priority date checker and immigration term explanations. Free to use.

Natural-language patent and scientific literature search across 200M+ patents and 216M+ papers from 170+ jurisdictions, with semantic/BM25 search, structured filters, and record retrieval. Hosted Streamable HTTP endpoint and Dockerized stdio bridge; requires a free Patsnap API key.

Patent prior art search and startup IP intelligence for AI founders. Clone risk score, defensibility map, patentable features, competitor patent landscape — free analysis in ~2 minutes. Full IP Portfolio Package (6 documents) available for $99. `pip install fittin-mcp`

Hybrid search (vector + BM25 + code graph) with structural code graph analysis and persistent semantic memory in a single local server. 10 tools, <350MB RAM, fully local, no API keys.

Zotero MCP server (`zotio-mcp`) with a capability-tagged tool registry and preview-first, journaled writes (an agent can't silently mutate or delete your library). Reads work keyless against the local Zotero desktop API; writes route to the Web API. Ships an MCPB bundle for one-click Claude Desktop install.

Instantly understand what real users think and why by querying our network of 1:1 Digital Twins - each representing a real person. Give your AI agents authentic human context to ground outputs, improve creative, and make smarter decisions.

MCP server for patent search and prior art discovery powered by Google Patents public dataset on BigQuery. Tools: search patents, get full patent details with CPC codes and citations, fetch legal claims text. Free to use.

Access legislative data from all 50 US states and Congress — search bills, get full text, track votes, and look up legislators via the LegiScan API.

Evidence-grounded web research for AI agents. Verifies page-local claims with citations, confidence bands, policy reports, and multi-page session synthesis via MCP.

Search 474 validated startup gaps from your AI editor. Find unsolved business problems by industry, role, or keyword — each with pain point, solution direction, and link to full blueprint. Zero API keys, works offline.

Research workspace MCP integrating Zotero, Obsidian, and NotebookLM. Search papers (arXiv/Semantic Scholar/PubMed/CrossRef), ingest into Zotero, sync notes to Obsidian, verify NotebookLM briefs. All three external tools optional. `pip install research-hub-pipeline` then `research-hub serve`.

MCP server for [SPARKIT](https://sparkit.science), a scientific research agent that searches the literature, reads papers, and returns cited Markdown reports. Submit a question via the `research` tool from Claude Desktop / Cursor / Claude Code; get back a ~90-second cited report without leaving the chat. `uv tool install sparkit-mcp` or `pip install sparkit-mcp`.

Provenance-first MCP server for the UNESCO Institute for Statistics (UIS): ~5,000 indicators on education (enrolment, completion, literacy, expenditure), science/R&D, culture and communication by country, region and year, with source URL, data release, retrieval timestamp and licence on every response. Hosted or local via `npx uis-mcp-server`.

Semantic search over 600k+ CS/AI papers with citation-graph traversal, full-text extraction, embeddings, and BibTeX export. Works anonymously or with a free key. Install: `npx scholar-feed-mcp init`.

Eleven keyless read-only lookups for questions a model cannot answer from a training cutoff, because the fact changed after it: what a given AI model costs today, whether a dependency is still maintained, what a SaaS stack costs per month, item-level search across public shadcn registries, published agent skills and configs, AI app-builder App Store readiness, ADA Title II accessibility reports for US .gov sites, and nonprofit good-standing. No API key, no signup. `npx -y kynth-mcp`

Auditable strategic-risk memos for AI agents — sanctions, regulatory, geopolitics, trade. Geography-routed regional specialists (Central Asia/Caspian, Gulf/Middle East), per-claim evidence discipline, schema-validated output, machine-verified audit. No live data retrieval. PyPI: `agenda-intelligence-md`.

Enable AI assistants to interact with your feature flags in [Flipt](https://flipt.io).

MCP server for [ITASCA PFC](https://www.itascacg.com/software/pfc) discrete element simulation — browse documentation, execute scripts, capture plots, and manage long-running tasks via a WebSocket bridge to the PFC GUI.

Conduct AI-powered qualitative research interviews and surveys at scale with [Agent Interviews](https://agentinterviews.com). Create interviewers, manage research projects, recruit participants, and analyze interview data through MCP.

200+ crypto tools for AI agents across 7 blockchains (Solana, Ethereum, Base, BSC, Polygon, Hedera, Bitcoin). Swaps, DeFi yield, conditional orders, NFTs, cross-chain bridges, and market intelligence. Hosted MCP at `https://emblemvault.ai/api/mcp` with OAuth 2.0 + PKCE for one-line install in Claude Code, Cursor, Windsurf, and any MCP-compatible client. API key and x402 per-tool-call micropayments also supported.

Build a searchable index from PDFs, EPUBs, and Word docs. Claude queries it via MCP and pulls grounded answers with exact page-and-section citations. Local-first, no cloud dependency.

Sentry's MCP service is primarily designed for human-in-the-loop coding agents. Our tool selection and priorities are focused on developer workflows and debugging use cases, rather than providing a general-purpose MCP server for all Sentry functionality. This remote MCP server acts as middleware to the upstream Sentry API, optimized for coding assistants like Cursor, Claude Code, and similar development tools. It's based on Cloudflare's work towards remote MCPs. You'll find everything you need to know by visiting the deployed service in production:

5 tools · Investigate errors and issues, Query project and team info

Cross-chain OTC trading via sealed-bid RFQ + HTLC atomic settlement. Six tools for AI agents to swap ETH, BTC, and SUI without bridges, custodians, or information leakage. Hosted at `hashlock.markets/mcp` or local stdio via `@hashlock-tech/mcp`.

Accountability layer for AI agents: a passport per agent version, a per-job mandate (allowed actions and systems, spending limits, expiry), a fail-closed gate that checks every action before a model is called, and an append-only hash-chained journal verified by a separate implementation in another language. Irreversible actions stop and wait for a person: the server deliberately has no confirm tool.

LEGO sets, parts, minifigs, colours, and inventories from Rebrickable. 10 tools for searching sets, finding parts by colour, browsing themes, comparing sets, and discovering MOC alternate builds. 26k sets, 62k parts, 17k minifigs embedded.

An MCP server implementation that provides tools for retrieving and processing documentation through vector search, enabling AI assistants to augment their responses with relevant documentation context