Jetopolis

by jetopolis.app · remote · no sign-in to list tools · v1.0.0 · published by app.jetopolis

Airline strategy game 1950-2030: live worlds, leaders, historical airlines, aircraft prices

Changes · 5

Compare Registry entry

7 tools: 5 change things and 2 only read.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things5Claude Code: ask: see these tools
Only reads2Claude Code: allow: see these tools

1 check matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http game https://jetopolis.app/mcp

Findings

Matches of fixed checks, with the text they matched.

1 warn

Warnhow_to_start
The server marks "how_to_start" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "how_to_start" says "start": a word for a change.
What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

7 tools

Changes things 5Creates or changes something that can be changed back.Claude Code: ask

aircraft_catalogAircraft types of the game catalog: seats in two classes, range, cruise speed, required runway, entry into service and end of production, and the list price in millions of US dolla…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Aircraft types of the game catalog: seats in two classes, range, cruise speed, required runway, entry into service and end of production, and the list price in millions of US dollars of the entry-into-service year. With year, only types already flying that year are returned and availabilityInYear says whether they are sold new or only on the used market.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
aircraft_priceIn-game catalogue price of a new aircraft in a given year: the entry-into-service price inflated by US CPI to nominal dollars of that year, and the same price in 2024 dollars.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
In-game catalogue price of a new aircraft in a given year: the entry-into-service price inflated by US CPI to nominal dollars of that year, and the same price in 2024 dollars. Accepts an id from aircraft_catalog or part of the name; when several types match and the year does not settle it, returns candidates to choose from.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
historical_airlinesReal airlines that operated in a given year (1950-2030) as the game knows them: name, IATA code when reliably known, home country and region, type, years of operation, and the coun…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Real airlines that operated in a given year (1950-2030) as the game knows them: name, IATA code when reliably known, home country and region, type, years of operation, and the countries each one served that year. Network data has decade precision: a country listed for the 1960s may have been added mid-decade. servedCountries lists destinations from home; when networkKnown is false only the home country is known. Sorted by the airline size in the dataset.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
how_to_startHow to start playing Jetopolis: the steps from the first click to the first route, the world pace and links to the game and its guides.1 finding
Why it is in this group
- The name "how_to_start" says "start": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "how_to_start" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "how_to_start" says "start": a word for a change.
  What this check looks for
Description, as the server wrote it
How to start playing Jetopolis: the steps from the first click to the first route, the world pace and links to the game and its guides. English or Russian.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
world_standingsPlayer airlines of a world ranked by rating: airline name and two-letter code, home base, rating, aircraft in service, open routes, founding date, status and a link to the public a…No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Player airlines of a world ranked by rating: airline name and two-letter code, home base, rating, aircraft in service, open routes, founding date, status and a link to the public airline card. Updated once per game day of that world. Cash, fares and profit are private to each player and are never returned.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

Only reads 2Looks things up and changes nothing.Claude Code: allow

get_worldOne Jetopolis world by id: the same card as in list_worlds plus finishedAt for a world that has ended.No findings
Why it is in this group
- The name "get_world" says "get": a word for reading.
Description, as the server wrote it
One Jetopolis world by id: the same card as in list_worlds plus finishedAt for a world that has ended.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
list_worldsPublic Jetopolis worlds open right now: name, server region, pace (Standard: 1 game day = 20 real minutes, Blitz: 5), start and end year, current game date and era, players and sea…No findings
Why it is in this group
- The name "list_worlds" says "list": a word for reading.
Description, as the server wrote it
Public Jetopolis worlds open right now: name, server region, pace (Standard: 1 game day = 20 real minutes, Blitz: 5), start and end year, current game date and era, players and seats, players active in the last 24 hours, and a link to open the world. Worlds never pause.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http game https://jetopolis.app/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__game__list_worlds",
      "mcp__game__get_world"
    ],
    "ask": [
      "mcp__game__world_standings",
      "mcp__game__historical_airlines",
      "mcp__game__aircraft_catalog",
      "mcp__game__aircraft_price",
      "mcp__game__how_to_start"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as game. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/app.jetopolis/game/changes.xml

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Anlyon alternative

5 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

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Source: MCP Registry. Synced Oct 21, 2026, 17:44 UTC.

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