YaCy peer-to-peer search MCP server

A peer-to-peer web search engine you run yourself, usable by AI agents without a search API or API key. This fork of YaCy adds stricter ranking, Chinese/Japanese/Korean search, author signatures on every document, coordinator-signed trust lists and NAT traversal through a libp2p relay. Agents: MCP server (io.github.pad01g/yacy-search), skill, llms.txt. Run it: docker run -d -p 127.0.0.1:8090:8090 -v yacydata:/opt/yacysearch_server/DATA ghcr.io/pad01g/yacy-improved-search:latest (keep the volume: it holds the peer key; change the default password yacy first). See the project page, FORK.md and the experiments in pad01g/yacy-lab. It does not interoperate with the public YaCy network by default.

Join without asking anyone: run a peer with -e YACYP2PBOOTSTRAPPEERS=http://:8090 (works across Tailscale too), publish your own pages and services, list your peer in pad01g/yacy-trust or run your own coordinator (a key and a signed file, no server). How to join — 日本語 · 简体中文 · Español · Português · 한국어 · Deutsch · Français. Pull requests are welcome** (branch improved-search): code, measurements, translations.

YaCy

Search Engine Software

What is YaCy?

YaCy is a full search engine application containing a server hosting a search index, a web application to provide a nice user front-end for searches and index creation and a production-ready web crawler with a scheduler to keep a search index fresh.

YaCy search portals can also be placed in an intranet environment, making it a replacement for commercial enterprise search solutions. A network scanner makes it easy to discover all available HTTP, FTP and SMB servers.

Running a personal Search Engine is a great tool for privacy; indeed YaCy was created with the privacy aspect as priority motivation for the project.

You can also use YaCy with a customized search page in your own web applications.

Large-Scale Web Search with a Peer-to-Peer Network

Each YaCy peer can be part of a large search network where search indexes can be exchanged with other YaCy installation over a built-in peer-to-peer network protocol.

Shortened. The full README is on GitHub.