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ArcadeIndex MCP server

Which MCP servers are ArcadeIndex's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-29

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Whose server it is
  • Registry nameio.arcadeindex/catalogverified in the MCP registry

The registry name sits under arcadeindex.io. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-29
  • Stateanswerschecked 2026-10-29
  • Tools7
  • Server calls itselfarcadeindex-catalog
  • Server version1.7.0
  • Protocol version2025-06-18

On 2026-10-29 the server answered initialize and tools/list without a sign-in. First answer in 186 ms.

Should an agent connect itNot proven either way yet
  • Its tools do play free browser games without downloads or sign-up; find games to play with friends on one computer, but not submit a game for review and listing on the index.
  • Checked on 6 of the 7 days it takes to judge reliability.

Once connected

  • For "play free browser games without downloads or sign-up", the likely first call is search_games.
  • For "find games to play with friends on one computer", the likely first call is search_games.
  • Parameters are untyped or undescribed in 5 of 7 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 6, the first on 2026-10-29
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 6 so far
  • What an agent can do with it2 of 3 use cases
  • Answeredmeasuring6 of the 7 daily checks it takes to print a share
  • Median first answer303 ms
  • Space in an agent's context≈ 3,696 tokensthe definitions of all its tools (7), which an agent carries on every turn
  • Tool definitionsB · 88 of 100
  • Typed results7 of 7 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 5 of 7

What an agent can do with it

  • can do · play free browser games without downloads or sign-up
  • can do · find games to play with friends on one computer
  • cannot · submit a game for review and listing on the index

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers7 tools · read 2026-10-29
  • search_games

    Find web games from a natural-language query plus optional filters (genre, mood, session length, players, quality, content rating, difficulty, inputs). Phrases like 'for kids', '2 player', 'under 10 minutes', 'not a shooter', 'easy' or…

  • get_game

    Full details of one game by id or {slug}-{id}. Aliased ids resolve to the canonical game (requested_id is set). Also returns listing-only, stale or suspect games: do NOT present play_url as instantly playable unless play_ready is true…

  • trending

    Games trending over the last day or week (genre scope when genre is set). trending_basis says whether play data or the recency fallback was used. Returns only published, playable games verified within the last 8 days (listing-only games…

  • games_like

    Games similar to an anchor game, ordered by similarity, each with similarity_reasons. Returns only published, playable games verified within the last 8 days (listing-only games with include_listing_only=true; plays=here or…

  • random_game

    One random eligible game for 'surprise me' flows; pass seed for a deterministic pick. Never returns Mature games. Zero eligible games gives game: null with code NO_MATCHES and relaxations.

  • new_games

    Games published in the last 30 days, newest first. Returns only published, playable games verified within the last 8 days (listing-only games with include_listing_only=true; plays=here or plays=developer_site picks one kind)…

  • play_game

    Play an ArcadeIndex game right inside the chat. Pass game_id (an id, {slug}-{id}, or a game's url from search_games, trending, games_like or new_games results) or query (the top search hit is played; a game that only plays on its…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "catalog": {
      "type": "http",
      "url": "https://arcadeindex.io/mcp/catalog"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http arcadeindex https://arcadeindex.io/mcp/catalog

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://arcadeindex.io/mcp/catalog as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.