# ArcadeIndex (remote · arcadeindex.io)

Find free browser games re-checked playable within 8 days, by genre, mood, age rating and players.

- Trust score: 74/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `arcadeindex.io`: 74/100 (this document), [markdown](https://verifymcp.io/servers/io-arcadeindex-catalog/mcp-catalog.md), [page](https://verifymcp.io/servers/io-arcadeindex-catalog/mcp-catalog)

## Channel facts

- Endpoint: `https://arcadeindex.io/mcp/catalog`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.6.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 72/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1866 tokens (~169/item across 11 items; 7 tools + 4 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 43/100
  - Stability observed for 13 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 77/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 18% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 50/100
  - Injection-marker check failed: the description of tool "play_game" contains an instruction to conceal the call from the user, the text "do not tell the user", at byte 482 of that field.
  - We read all 7 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.
  - Supports UI / widget rendering.

## Install

### How do I install the ArcadeIndex MCP server?

ArcadeIndex is a hosted endpoint at https://arcadeindex.io/mcp/catalog, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

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

### Cursor

```json
{
  "mcpServers": {
    "io-arcadeindex-catalog": {
      "url": "https://arcadeindex.io/mcp/catalog"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "io-arcadeindex-catalog": {
      "type": "http",
      "url": "https://arcadeindex.io/mcp/catalog"
    }
  }
}
```

### Codex

```toml
[mcp_servers.io-arcadeindex-catalog]
url = "https://arcadeindex.io/mcp/catalog"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-arcadeindex-catalog": {
      "type": "remote",
      "url": "https://arcadeindex.io/mcp/catalog",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-arcadeindex-catalog --url 'https://arcadeindex.io/mcp/catalog' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-arcadeindex-catalog:
    url: "https://arcadeindex.io/mcp/catalog"
```

### Netclaw

```json
{
  "McpServers": {
    "io-arcadeindex-catalog": {
      "Transport": "http",
      "Url": "https://arcadeindex.io/mcp/catalog"
    }
  }
}
```

### Vellum

```bash
assistant mcp add io-arcadeindex-catalog -t streamable-http -u 'https://arcadeindex.io/mcp/catalog'
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-04 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 30 to 33. That category is still filling its 30-day observation window: 9 days of observed history at the previous scan, 10 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-25 (score 69, 0)

- [security] Tool “play_game” rewrote its description, which is the text the model reads
- [functional] Server version: 1.6.0 → 1.7.0

### 2026-10-24 (score 69, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-23 (score 68)

First indexed and scored.

## MCP tools (7)

### `search_games` (~377 tokens)

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 'chill' are turned into filters (echoed as interpreted_filters); explicit params win. 'like {title}' or 'similar to {title}' naming a game in the catalog returns that game's games_like results (anchor is set). 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). content_rating_max defaults to teen. Zero results is a success with code NO_MATCHES and up to 3 executed relaxations whose args you can call again (with the tool named in tool, when set). Quote match_reasons and link play_url; render 'via ArcadeIndex' per the attribution block.

Input parameters:

- `content_rating_max` (string)
- `difficulty` (array)
- `exclude_genres` (array)
- `genre` (string)
- `include_listing_only` (boolean)
- `inputs` (array)
- `interpret` (boolean): Rule-based intent extraction (agent-api §7).
- `limit` (integer)
- `min_quality` (integer)
- `mood` (array)
- `players` (string)
- `plays` (string): here: only games that play embedded (on ArcadeIndex and in the in-chat player); developer_site: only games that play on the developer's own site (implies include_listing_only).
- `query` (string, required): Natural-language query, e.g. 'easy 2 player game for kids'.
- `session_length_max` (integer)

### `get_game` (~109 tokens)

Get game details

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. Errors: NOT_FOUND (unknown, unavailable or not public), GONE (delisted).

Input parameters:

- `game_id` (string, required): A 6-char game id or the {slug}-{id} path segment. Aliased ids resolve to the canonical game.

### `trending` (~271 tokens)

Trending games

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 with include_listing_only=true; plays=here or plays=developer_site picks one kind). content_rating_max defaults to teen. Zero results is a success with code NO_MATCHES and up to 3 executed relaxations whose args you can call again (with the tool named in tool, when set). Quote match_reasons and link play_url; render 'via ArcadeIndex' per the attribution block.

Input parameters:

- `content_rating_max` (string)
- `difficulty` (array)
- `exclude_genres` (array)
- `genre` (string)
- `include_listing_only` (boolean)
- `inputs` (array)
- `limit` (integer)
- `min_quality` (integer)
- `mood` (array)
- `players` (string)
- `plays` (string): here: only games that play embedded (on ArcadeIndex and in the in-chat player); developer_site: only games that play on the developer's own site (implies include_listing_only).
- `session_length_max` (integer)
- `window` (string)

### `games_like` (~284 tokens)

Games like a game

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 plays=developer_site picks one kind). content_rating_max defaults to teen. Zero results is a success with code NO_MATCHES and up to 3 executed relaxations whose args you can call again (with the tool named in tool, when set). Quote match_reasons and link play_url; render 'via ArcadeIndex' per the attribution block.

Input parameters:

- `content_rating_max` (string)
- `difficulty` (array)
- `exclude_genres` (array)
- `game_id` (string, required): A 6-char game id or the {slug}-{id} path segment. Aliased ids resolve to the canonical game.
- `genre` (string)
- `include_listing_only` (boolean)
- `inputs` (array)
- `limit` (integer)
- `min_quality` (integer)
- `mood` (array)
- `players` (string)
- `plays` (string): here: only games that play embedded (on ArcadeIndex and in the in-chat player); developer_site: only games that play on the developer's own site (implies include_listing_only).
- `session_length_max` (integer)

### `random_game` (~182 tokens)

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.

Input parameters:

- `content_rating_max` (string)
- `difficulty` (array)
- `exclude_genres` (array)
- `genre` (string)
- `include_listing_only` (boolean)
- `inputs` (array)
- `min_quality` (integer)
- `mood` (array)
- `players` (string)
- `plays` (string): here: only games that play embedded (on ArcadeIndex and in the in-chat player); developer_site: only games that play on the developer's own site (implies include_listing_only).
- `seed` (string): Deterministic pick.
- `session_length_max` (integer)

### `new_games` (~247 tokens)

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). content_rating_max defaults to teen. Zero results is a success with code NO_MATCHES and up to 3 executed relaxations whose args you can call again (with the tool named in tool, when set). Quote match_reasons and link play_url; render 'via ArcadeIndex' per the attribution block.

Input parameters:

- `content_rating_max` (string)
- `difficulty` (array)
- `exclude_genres` (array)
- `genre` (string)
- `include_listing_only` (boolean)
- `inputs` (array)
- `limit` (integer)
- `min_quality` (integer)
- `mood` (array)
- `players` (string)
- `plays` (string): here: only games that play embedded (on ArcadeIndex and in the in-chat player); developer_site: only games that play on the developer's own site (implies include_listing_only).
- `session_length_max` (integer)

### `play_game` (~265 tokens)

Play a game in the chat

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 developer's site comes back as link_out). Hosts that support MCP Apps show a player with Next game and More like this (mode player); some chat apps do not allow the game frame yet, and then the player offers the game on arcadeindex.io in a new tab, so do not tell the user the game is running in the chat unless they say so. Games that cannot be framed here (listing-only, not checked in the last 8 days, or a site the chat app does not allow) return mode link_out with link_out.url and the reason: give the user that link. Hosts without MCP Apps get the same data as text: link play_url. Errors: NOT_FOUND, INVALID_ARGUMENT.

Input parameters:

- `game_id` (string): A 6-char game id, the {slug}-{id} segment, or the game's ArcadeIndex page URL (from search results).
- `query` (string): Instead of game_id: a title or request; the top search_games hit is played.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/io-arcadeindex-catalog/mcp-catalog#diagnostics

## Score history

- 2026-11-05: 74
- 2026-11-04: 74
- 2026-11-03: 73
- 2026-11-02: 73
- 2026-11-01: 72
- 2026-10-31: 72
- 2026-10-30: 71
- 2026-10-29: 71
- 2026-10-28: 71
- 2026-10-27: 70
- 2026-10-26: 70
- 2026-10-25: 69
- 2026-10-24: 69
- 2026-10-23: 68

## Common questions

### What is the ArcadeIndex MCP server?

ArcadeIndex is an MCP server listed in the public MCP registry as io.arcadeindex/catalog. Find free browser games re-checked playable within 8 days, by genre, mood, age rating and players. This page covers its hosted endpoint (https://arcadeindex.io/mcp/catalog).

### Is the ArcadeIndex MCP server safe to use?

ArcadeIndex scores 74 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the ArcadeIndex MCP server expose?

ArcadeIndex exposes 7 tools: search_games, get_game, trending, games_like, random_game, and 2 more. Their descriptions and schemas cost roughly 1,735 tokens of context every time the server is loaded.

### Does the ArcadeIndex MCP server require authentication?

No. We connected to ArcadeIndex without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the ArcadeIndex MCP server still maintained?

ArcadeIndex is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://arcadeindex.io/mcp/catalog
- Website: https://arcadeindex.io/mcp
- Changelog RSS feed: https://verifymcp.io/servers/io-arcadeindex-catalog/mcp-catalog.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-arcadeindex-catalog/mcp-catalog.json
- HTML version of this page: https://verifymcp.io/servers/io-arcadeindex-catalog/mcp-catalog