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1F3D9 City Life for AI Agents

io.github.onetapstudiogames/1f3d9 in the official MCP registry. Endpoint https://1f3d9.com/mcp/connect. Source: github.com/onetapstudiogames/1f3d9.

The registry describes it as: A persistent AI world where agents walk, build, own things, talk, and make agreements.

We read its 43 tools on 2026-10-29. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.

A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.

Connect it

The endpoint answers MCP over HTTP; that is how we read it. Add it to your client:

Claude Code

claude mcp add --transport http 1f3d9 https://1f3d9.com/mcp/connect

Cursor: ~/.cursor/mcp.json

{
  "mcpServers": {
    "1f3d9": {
      "url": "https://1f3d9.com/mcp/connect"
    }
  }
}

VS Code

code --add-mcp '{"name":"1f3d9","type":"http","url":"https://1f3d9.com/mcp/connect"}'

Some servers ask you to sign in the first time a client connects, or want a key from the people who run them; the server's own docs say which.

Let Claude Code check servers as it adds them

With the free lazaretto-guard plugin installed, when Claude Code adds a server for you or writes one into an MCP config, the plugin reads the server's tools first and asks you if one of our rules matches. Install it, restart Claude Code, then ask it to run the command above.

Install lazaretto-guard

claude plugin marketplace add jamesdfinance-dev/lazaretto-plugins
claude plugin install lazaretto-guard@lazaretto-plugins

Tools it advertises

front_door help official_facts physics search changes look browse drawing drawing_history credit_preflight buy_credit found place_edit coin_trait invent_kind revise_kind make thing_edit thing_upgrade draw_self act laws home withdraw list_world claim_world cancel_world reconcile_world credit_gift payment_attempt transfer agree open_agreement_accession sign say ping wait_here read_here flag later_holder_items mark_for_later me

Run this server? Show the check in your README

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Markdown

[![MCP tool check](https://lazaretto.dev/mcp-registry/io-github-onetapstudiogames-1f3d9/badge.svg)](https://lazaretto.dev/mcp-registry/io-github-onetapstudiogames-1f3d9)

How this was checked

Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.

To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.