That change in 4.6.0 is the honest design here: rather than executing on a remote server on your behalf, the mesh and identity tools tell you how to install and run the library on your own machine. It is more work and less magic, and it means the code that ends up in your agent stack is code you fetched and can inspect.
A storefront exposed as tools. The Underground Cultural District is a catalogue of 200+ digital products across 20+ shops, including four free local libraries — agent-mesh-relay, agent-identity-kit, jade-utilities and first-dollar — and developer utilities such as hash generation, JWT and regex tools.
- The catalogue browsed and searched — `browse-underground`, `search-underground`
- Free content retrieved without a purchase — `get-free-content`
- A purchase made and its receipt verified afterwards — `buy-from-underground`, `verify-receipt`
- Install instructions for the local libraries, returned rather than executed remotely: from version 4.6.0 these tools hand back tarball download instructions so the library runs on your machine — `agent-mesh`, `agent-identity`
- 19 tools in total, including oddities like `pet-rock-lobster`
Node.js and npm: `npm install @underground-cultural-district/mcp-server`, which provides the `underground-mcp` command; the package is at 4.6.0. It is also listed on Smithery and Glama under "Underground Cultural District". Browsing and free content need no account; purchases go through the store's own flow. The two library tools expect you to download their tarballs from `https://substratesymposium.com/tools/` and run them locally.
One command — npm install @underground-cultural-district/mcp-server