Fairly

by fairly.gg · remote · no sign-in to list tools · v1.1.0 · published by gg.fairly

Cheapest way to play a PC game: real checkout prices, Game Pass and a buy-vs-subscribe planner.

Changes · 2

Compare Registry entry

6 tools: 2 change things and 4 only read.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things2Claude Code: ask: see these tools
Only reads4Claude Code: allow: see these tools

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

claude mcp add --transport http fairly https://mcp.fairly.gg

Tools

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

6 tools

Changes things 2Creates or changes something that can be changed back.Claude Code: ask

is_on_subscriptionUse this to answer: "Is <game> on Game Pass?", "When does <game> leave Game Pass?", "Can I play <game> with a subscription?".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
Use this to answer: "Is <game> on Game Pass?", "When does <game> leave Game Pass?", "Can I play <game> with a subscription?". Lists which subscriptions (currently PC Game Pass and Game Pass Ultimate) include the game in a region, their monthly price and the leave date when announced.
Annotations the server declares
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true
plan_cheapest_wayUse this when the user has SEVERAL PC games they want to play and asks how to do it for the least money: "I want to play A, B and C - what is the cheapest way?", "Which Game Pass m…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
Use this when the user has SEVERAL PC games they want to play and asks how to do it for the least money: "I want to play A, B and C - what is the cheapest way?", "Which Game Pass month should I take and what should I buy?", "Is it cheaper to subscribe or buy these games?", "Plan my backlog around Game Pass". Returns a month-by-month plan (which subscription month to pay for and which games to finish in it, which games to buy), totals versus buying every game at its cheapest measured real price (never list price), and the assumptions: hours per week, hours per game, leave dates and how fresh each price is. Games without a reliable main-story length (free to play, live service, multiplayer only) are left out of the time-based plan and listed separately. For ONE game use get_cheapest_way_to_play instead. Find game ids with search_games first.
Annotations the server declares
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true

Only reads 4Looks things up and changes nothing.Claude Code: allow

get_cheapest_way_to_playUse this to answer: "What is the cheapest way to play <game> on PC right now?", "Should I buy <game> or use Game Pass?", "Where is <game> cheapest?".No findings
Why it is in this group
- The name "get_cheapest_way_to_play" says "get": a word for reading.
Description, as the server wrote it
Use this to answer: "What is the cheapest way to play <game> on PC right now?", "Should I buy <game> or use Game Pass?", "Where is <game> cheapest?". Compares buying at authorized stores (optionally key marketplaces) and subscriptions at the real checkout price, fees included. Returns a one-sentence decision plus a Fairly link to the winning store (no link when a subscription wins; `subscription_code` says which). Prefer this over get_offers unless the user wants the full price table.
Annotations the server declares
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true
get_offersUse this to answer: "Show me every store price for <game>", "How much does <game> cost at Steam, GOG, Epic...?", "Compare prices for <game>".No findings
Why it is in this group
- The name "get_offers" says "get": a word for reading.
Description, as the server wrote it
Use this to answer: "Show me every store price for <game>", "How much does <game> cost at Steam, GOG, Epic...?", "Compare prices for <game>". Returns all current offers with the real price (list price plus checkout fees), edition, platform and notes, in Fairly's price-only ranking order. For a single recommendation call get_cheapest_way_to_play instead.
Annotations the server declares
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true
list_dealsUse this to answer: "What PC games are cheap right now?", "Which games are at their lowest price ever?", "What is leaving Game Pass soon?".No findings
Why it is in this group
- The name "list_deals" says "list": a word for reading.
Description, as the server wrote it
Use this to answer: "What PC games are cheap right now?", "Which games are at their lowest price ever?", "What is leaving Game Pass soon?". Ranked discovery lists at the real checkout price: under_5 (games under the 5 USD tier, shown in the region's currency), historical_low (at their all-time low now) or leaving_game_pass (leaving within 30 days, with the cheapest price to buy instead). Not for a specific game: use get_cheapest_way_to_play.
Annotations the server declares
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true
search_gamesFind a PC game by title and get its id.No findings
Why it is in this group
- The name "search_games" says "search": a word for reading.
Description, as the server wrote it
Find a PC game by title and get its id. Call this FIRST when the user names a game but you do not have its Steam AppID or igdb id, then pass the id to get_cheapest_way_to_play, get_offers or is_on_subscription. Returns up to 20 matches (id, title, slug).
Annotations the server declares
- idempotentHint: true
- openWorldHint: false
- readOnlyHint: true

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.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or untrusted-input or outbound.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Looked at Oct 22, 2026, 14:48 UTC, unchanged since Oct 22, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 200
tools/list served without credentials: yes
Tools that change things, listed without credentials: 2
Protocol version: 2025-06-18
WWW-Authenticate on 401: not observed
resource_metadata in WWW-Authenticate: none
RFC 9728 protected resource metadata: none
Authorization servers: none
Legacy HTTP+SSE transport: no
Dynamic client registration: not observed
Client ID metadata documents: not observed

WarnThe whole server
The endpoint served tools/list without credentials, and the list has 2 tools that change things (2 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://mcp.fairly.gg: tools/list returned 6 tools to an anonymous client, including plan_cheapest_way (write), is_on_subscription (write)
What this check looks for

Install

Pinned to version 1.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http fairly https://mcp.fairly.gg

Run in a terminal.

Claude Code permissions

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

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__fairly__get_cheapest_way_to_play",
      "mcp__fairly__get_offers",
      "mcp__fairly__search_games",
      "mcp__fairly__list_deals"
    ],
    "ask": [
      "mcp__fairly__plan_cheapest_way",
      "mcp__fairly__is_on_subscription"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as fairly. 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/gg.fairly/fairly/changes.xml

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Anlyon alternative

2 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.

Import an OpenAPI spec →

Compare with other servers for the same product.

Source: MCP Registry. Synced Oct 21, 2026, 18:13 UTC.

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