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ArcadeIndex

by io.arcadeindex
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Get game details

get_game
Read-onlyIdempotent

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).

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "game_id": "<game_id>"
    },
    "name": "get_game"
  }
}

Input Schema

NameRequiredDescriptionDefault
game_idYesA 6-char game id or the {slug}-{id} path segment. Aliased ids resolve to the canonical game.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "properties": {
-      "applied_filters": {
-        "type": "object"
-      },
-      "attribution": {
-        "description": "Attribution block (agent-api §1.1). Render 'via {source}' with a link.",
-        "type": "object"
-      },
-      "code": {
-        "type": "string"
-      },
-      "game": {
-        "anyOf": [
-          {
-            "properties": {
-              "accessibility_notes": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "content_rating": {
-                "enum": [
-                  "everyone",
-                  "everyone_10",
-                  "teen",
-                  "mature"
-                ],
-                "type": "string"
-              },
-              "controls_summary": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "description": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "developer": {
-                "anyOf": [
-                  {
-                    "properties": {
-                      "claimed": {
-                        "type": "boolean"
-                      },
-                      "name": {
-                        "type": "string"
-                      },
-                      "url": {
-                        "type": "string"
-                      }
-                    },
-                    "type": "object"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ],
-                "description": "Null when the developer is unknown."
-              },
-              "difficulty": {
-                "anyOf": [
-                  {
-                    "enum": [
-                      "easy",
-                      "medium",
-                      "hard",
-                      "brutal"
-                    ],
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "embed_status": {
-                "enum": [
-                  "playable",
-                  "listing_only"
-                ],
-                "type": "string"
-              },
-              "external_play_url": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "field_sources": {
-                "additionalProperties": {
-                  "anyOf": [
-                    {
-                      "enum": [
-                        "source",
-                        "ai",
-                        "ai+verified",
-                        "behavioral",
-                        "developer",
-                        "moderator"
-                      ],
-                      "type": "string"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "type": "object"
-              },
-              "game_id": {
-                "type": "string"
-              },
-              "genres": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "hook": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "how_to_play": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "inputs": {
-                "anyOf": [
-                  {
-                    "items": {
-                      "enum": [
-                        "mouse",
-                        "keyboard",
-                        "touch",
-                        "gamepad"
-                      ],
-                      "type": "string"
-                    },
-                    "type": "array"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "languages": {
-                "anyOf": [
-                  {
-                    "items": {
-                      "type": "string"
-                    },
-                    "type": "array"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "last_verified_at": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "match_reasons": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "mechanics": {
-                "anyOf": [
-                  {
-                    "items": {
-                      "type": "string"
-                    },
-                    "type": "array"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "multiplayer_mode": {
-                "anyOf": [
-                  {
-                    "enum": [
-                      "none",
-                      "local",
-                      "online",
-                      "both"
-                    ],
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "play_ready": {
-                "description": "Only present play_url as instantly playable when true (agent-api §4.4).",
-                "type": "boolean"
-              },
-              "play_url": {
-                "description": "Our own stable game page with ?ref=agent. Never the raw embed URL.",
-                "type": "string"
-              },
-              "player_counts": {
-                "anyOf": [
-                  {
-                    "items": {
-                      "enum": [
-                        "1",
-                        "2",
-                        "2plus",
-                        "massive"
-                      ],
-                      "type": "string"
-                    },
-                    "type": "array"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "published_at": {
-                "type": "string"
-              },
-              "quality_score": {
-                "type": "integer"
-              },
-              "requested_id": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "screenshots": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "session_length_minutes": {
-                "anyOf": [
-                  {
-                    "type": "integer"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "session_length_range": {
-                "anyOf": [
-                  {
-                    "items": {
-                      "type": "integer"
-                    },
-                    "type": "array"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "similarity_reasons": {
-                "anyOf": [
-                  {
-                    "items": {
-                      "type": "string"
-                    },
-                    "type": "array"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "source_url": {
-                "type": "string"
-              },
-              "thumbnail": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "title": {
-                "type": "string"
-              },
-              "url": {
-                "description": "Canonical game page, no query string.",
-                "type": "string"
-              },
-              "verification_state": {
-                "enum": [
-                  "ok",
-                  "suspect"
-                ],
-                "type": "string"
-              },
-              "vibe_tags": {
-                "anyOf": [
-                  {
-                    "items": {
-                      "type": "string"
-                    },
-                    "type": "array"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "meta": {
-        "type": "object"
-      },
-      "relaxations": {
-        "items": {
-          "properties": {
-            "args": {
-              "additionalProperties": {},
-              "description": "Complete tool arguments to call again (search_games args carry interpret: false).",
-              "type": "object"
-            },
-            "changes": {
-              "items": {
-                "properties": {
-                  "from": {
-                    "anyOf": [
-                      {
-                        "type": "string"
-                      },
-                      {
-                        "type": "number"
-                      },
-                      {
-                        "type": "boolean"
-                      },
-                      {
-                        "items": {
-                          "type": "string"
-                        },
-                        "type": "array"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "param": {
-                    "type": "string"
-                  },
-                  "to": {
-                    "anyOf": [
-                      {
-                        "type": "string"
-                      },
-                      {
-                        "type": "number"
-                      },
-                      {
-                        "type": "boolean"
-                      },
-                      {
-                        "items": {
-                          "type": "string"
-                        },
-                        "type": "array"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  }
-                },
-                "type": "object"
-              },
-              "type": "array"
-            },
-            "result_count": {
-              "type": "integer"
-            },
-            "step": {
-              "type": "string"
-            },
-            "tool": {
-              "const": "games_like",
-              "description": "Call this tool with args instead of the tool that returned the relaxation; absent means the same tool.",
-              "type": "string"
-            }
-          },
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "game",
-      "code",
-      "relaxations",
-      "applied_filters",
-      "attribution",
-      "meta"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "attribution": {
-        "description": "Attribution block (agent-api §1.1). Render 'via {source}' with a link.",
-        "type": "object"
-      },
-      "error": {
-        "properties": {
-          "code": {
-            "type": "string"
-          },
-          "details": {
-            "anyOf": [
-              {
-                "additionalProperties": {},
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "message": {
-            "type": "string"
-          },
-          "retry_after_seconds": {
-            "anyOf": [
-              {
-                "type": "integer"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "type": "object"
-      },
-      "meta": {
-        "type": "object"
-      }
-    },
-    "required": [
-      "error",
-      "attribution",
-      "meta"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "properties": {
+      "applied_filters": {
+        "type": "object"
+      },
+      "attribution": {
+        "description": "Attribution block (agent-api §1.1). Render 'via {source}' with a link.",
+        "type": "object"
+      },
+      "code": {
+        "type": "string"
+      },
+      "game": {
+        "anyOf": [
+          {
+            "properties": {
+              "accessibility_notes": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "content_rating": {
+                "enum": [
+                  "everyone",
+                  "everyone_10",
+                  "teen",
+                  "mature"
+                ],
+                "type": "string"
+              },
+              "controls_summary": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "description": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "developer": {
+                "anyOf": [
+                  {
+                    "properties": {
+                      "claimed": {
+                        "type": "boolean"
+                      },
+                      "name": {
+                        "type": "string"
+                      },
+                      "url": {
+                        "type": "string"
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ],
+                "description": "Null when the developer is unknown."
+              },
+              "difficulty": {
+                "anyOf": [
+                  {
+                    "enum": [
+                      "easy",
+                      "medium",
+                      "hard",
+                      "brutal"
+                    ],
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "embed_status": {
+                "enum": [
+                  "playable",
+                  "listing_only"
+                ],
+                "type": "string"
+              },
+              "external_play_url": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "field_sources": {
+                "additionalProperties": {
+                  "anyOf": [
+                    {
+                      "description": "Where a visible field's value comes from, one of: source, ai, ai+verified, ai+source, behavioral, developer, moderator (ai+verified: input listeners corroborated an AI value; ai+source: the game's source page names it).",
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "type": "object"
+              },
+              "game_id": {
+                "type": "string"
+              },
+              "genres": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "hook": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "how_to_play": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "inputs": {
+                "anyOf": [
+                  {
+                    "items": {
+                      "enum": [
+                        "mouse",
+                        "keyboard",
+                        "touch",
+                        "gamepad"
+                      ],
+                      "type": "string"
+                    },
+                    "type": "array"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "languages": {
+                "anyOf": [
+                  {
+                    "items": {
+                      "type": "string"
+                    },
+                    "type": "array"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "last_verified_at": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "match_reasons": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "mechanics": {
+                "anyOf": [
+                  {
+                    "items": {
+                      "type": "string"
+                    },
+                    "type": "array"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "multiplayer_mode": {
+                "anyOf": [
+                  {
+                    "enum": [
+                      "none",
+                      "local",
+                      "online",
+                      "both"
+                    ],
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "play_ready": {
+                "description": "Only present play_url as instantly playable when true (agent-api §4.4).",
+                "type": "boolean"
+              },
+              "play_url": {
+                "description": "Our own stable game page with ?ref=agent. Never the raw embed URL.",
+                "type": "string"
+              },
+              "player_counts": {
+                "anyOf": [
+                  {
+                    "items": {
+                      "enum": [
+                        "1",
+                        "2",
+                        "2plus",
+                        "massive"
+                      ],
+                      "type": "string"
+                    },
+                    "type": "array"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "published_at": {
+                "type": "string"
+              },
+              "quality_score": {
+                "type": "integer"
+              },
+              "requested_id": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "screenshots": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "session_length_minutes": {
+                "anyOf": [
+                  {
+                    "type": "integer"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "session_length_range": {
+                "anyOf": [
+                  {
+                    "items": {
+                      "type": "integer"
+                    },
+                    "type": "array"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "similarity_reasons": {
+                "anyOf": [
+                  {
+                    "items": {
+                      "type": "string"
+                    },
+                    "type": "array"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "source_url": {
+                "type": "string"
+              },
+              "thumbnail": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "title": {
+                "type": "string"
+              },
+              "url": {
+                "description": "Canonical game page, no query string.",
+                "type": "string"
+              },
+              "verification_state": {
+                "enum": [
+                  "ok",
+                  "suspect"
+                ],
+                "type": "string"
+              },
+              "vibe_tags": {
+                "anyOf": [
+                  {
+                    "items": {
+                      "type": "string"
+                    },
+                    "type": "array"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "meta": {
+        "type": "object"
+      },
+      "relaxations": {
+        "items": {
+          "properties": {
+            "args": {
+              "additionalProperties": {},
+              "description": "Complete tool arguments to call again (search_games args carry interpret: false).",
+              "type": "object"
+            },
+            "changes": {
+              "items": {
+                "properties": {
+                  "from": {
+                    "anyOf": [
+                      {
+                        "type": "string"
+                      },
+                      {
+                        "type": "number"
+                      },
+                      {
+                        "type": "boolean"
+                      },
+                      {
+                        "items": {
+                          "type": "string"
+                        },
+                        "type": "array"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ]
+                  },
+                  "param": {
+                    "type": "string"
+                  },
+                  "to": {
+                    "anyOf": [
+                      {
+                        "type": "string"
+                      },
+                      {
+                        "type": "number"
+                      },
+                      {
+                        "type": "boolean"
+                      },
+                      {
+                        "items": {
+                          "type": "string"
+                        },
+                        "type": "array"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ]
+                  }
+                },
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "result_count": {
+              "type": "integer"
+            },
+            "step": {
+              "type": "string"
+            },
+            "tool": {
+              "const": "games_like",
+              "description": "Call this tool with args instead of the tool that returned the relaxation; absent means the same tool.",
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "game",
+      "code",
+      "relaxations",
+      "applied_filters",
+      "attribution",
+      "meta"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "attribution": {
+        "description": "Attribution block (agent-api §1.1). Render 'via {source}' with a link.",
+        "type": "object"
+      },
+      "error": {
+        "properties": {
+          "code": {
+            "type": "string"
+          },
+          "details": {
+            "anyOf": [
+              {
+                "additionalProperties": {},
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "message": {
+            "type": "string"
+          },
+          "retry_after_seconds": {
+            "anyOf": [
+              {
+                "type": "integer"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "type": "object"
+      },
+      "meta": {
+        "type": "object"
+      }
+    },
+    "required": [
+      "error",
+      "attribution",
+      "meta"
+    ],
+    "type": "object"
+  }
+]
  2. First observed

TDQS

A4.1/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover the safety profile (readOnly, idempotent, closed-world), and the description adds genuinely new behavioral facts: aliased ids resolve to canonical with requested_id set, and results may include listing-only, stale or suspect games. Error semantics (NOT_FOUND = unknown/unavailable/not public, GONE = delisted) go well beyond what annotations provide.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three dense sentences, front-loaded with the identification rule before the usage caveat and error codes; nothing is redundant. The final sentence compresses two error codes into a terse parenthetical, which is efficient but slightly cramped.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, and the description still calls out the two output fields that drive agent behavior (play_url validity via play_ready, requested_id for aliases). Combined with full error coverage, an agent has everything needed to call this correctly and interpret the result.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 100% schema description coverage on a single parameter, the schema already documents the 6-char id / {slug}-{id} format and alias resolution. The description repeats essentially the same information, adding no new syntax or format detail, so the baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ("Full details of one game") plus the accepted identifier forms (id or {slug}-{id}), which separates it from list-oriented siblings like search_games or new_games. It stops short of naming a sibling explicitly, so the differentiation is implied rather than stated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives concrete operational guidance: do NOT present play_url as instantly playable unless play_ready is true, and it maps failure conditions to NOT_FOUND and GONE. It does not explicitly say when to prefer this over search_games or play_game, so it is context-rich but lacks stated alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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