ArcadeIndex
REMOTE · ARCADEINDEX.IO
Find free browser games re-checked playable within 8 days, by genre, mood, age rating and players.
Available components
Last scanned (1 hour ago)
Scores higher than 61% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Entertainment and Games
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. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability72
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (good).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management43
- Stability observed for 13 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage77
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 18% of tool parameters carry a description.Partial
- Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety50
- 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. See how to fix → Fail
- We read all 7 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
- Supports UI / widget rendering.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 4 Nov 26 +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.
- 2 Nov 26 +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.
- 31 Oct 26 +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.
- 28 Oct 26 +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.
- 26 Oct 26 +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.
- 25 Oct 26 0
- Tool “play_game” rewrote its description, which is the text the model reads security
- Server version: 1.6.0 → 1.7.0 functional
- 24 Oct 26 +1
- Stability: unverified → 0.03 ▲ functional
- 23 Oct 26 68
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://arcadeindex.io/mcp/catalog
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=arcadeindex.io | CN=YE2,O=Let's Encrypt,C=US | 18 Oct 2026 | 16 Jan 2027 | ECDSA 256 | ECDSA-SHA384 | 6b08232d9f1cd750ed3ac987b224aab02f8 |
| SANs: arcadeindex.io | ||||||
| CN=YE2,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 4df3b15dd6c0784c507cd37b58e6f115 |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of arcadeindex.io. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| io. | present | 38690 | 8 | Verified |
| arcadeindex.io. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000; includeSubDomains |
| content-security-policy | frame-src https:; frame-ancestors 'self'; object-src 'none'; base-uri 'self' |
| x-content-type-options | nosniff |
| referrer-policy | strict-origin-when-cross-origin |
| permissions-policy | camera=(), microphone=(), geolocation=(), payment=(), usb=(), serial=(), hid=() |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://arcadeindex.io/mcp/catalog | Verified | 200 | |
| http (plaintext) | http://arcadeindex.io/mcp/catalog | HTTPS enforced | 301 | https://arcadeindex.io/mcp/catalog |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
games_like Games like a game ~284
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.
| Name | Type | Req | Description |
|---|---|---|---|
| content_rating_max | string | – | – |
| difficulty | array | – | – |
| exclude_genres | array | – | – |
| game_id | string | yes | 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 | – | – |
Structured output declared, but exposes no named fields.
No examples provided.
get_game Get game details ~109
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).
| Name | Type | Req | Description |
|---|---|---|---|
| game_id | string | yes | A 6-char game id or the {slug}-{id} path segment. Aliased ids resolve to the canonical game. |
Structured output declared, but exposes no named fields.
No examples provided.
new_games New games ~247
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | – | – |
Structured output declared, but exposes no named fields.
No examples provided.
play_game Play a game in the chat ~265
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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. |
Structured output declared, but exposes no named fields.
No examples provided.
random_game Random game ~182
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | – | – |
Structured output declared, but exposes no named fields.
No examples provided.
search_games Search games ~377
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | Natural-language query, e.g. 'easy 2 player game for kids'. |
| session_length_max | integer | – | – |
Structured output declared, but exposes no named fields.
No examples provided.
trending Trending games ~271
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | – | – |
Structured output declared, but exposes no named fields.
No examples provided.
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.
remote · arcadeindex.io
claude mcp add --transport http io-arcadeindex-catalog 'https://arcadeindex.io/mcp/catalog'
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.