catalog

Get one add-on

get_addon

Read-onlyIdempotent

Everything the catalog holds on a single add-on: description, developer, declared simulator compatibility, rating, every store offer with its VAT split and sale expiry, the lowest price ever recorded, and the real-world aircraft types and airports it implements.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`slug`	Yes	Add-on slug, as it appears in https://fsaircraft.net/addons/{slug}

Output Schema

TableJSON Schema

Name	Required	Description	Default
`addon`	Yes
`as_of`	Yes
`found`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 23, 2026

changedOutput schema / properties / addon / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "aircraft_types": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "icao_designator": {
-              "type": "string"
-            },
-            "manufacturer": {
-              "type": "string"
-            },
-            "model": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "icao_designator",
-            "manufacturer",
-            "model"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "airports": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "country": {
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "icao": {
-              "type": "string"
-            },
-            "name": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "icao",
-            "name",
-            "country"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "also_listed_as": {
-        "description": "Other slugs merged into this add-on by cross-store dedupe",
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "category": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "currency": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "description": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "developer": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "discount_pct": {
-        "maximum": 9007199254740991,
-        "minimum": -9007199254740991,
-        "type": "integer"
-      },
-      "first_seen_at": {
-        "type": "string"
-      },
-      "image_url": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "is_lowest_ever": {
-        "type": "boolean"
-      },
-      "net_price_cents": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": -9007199254740991,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "VAT-excluded, where the store VAT rate is known"
-      },
-      "offer_count": {
-        "maximum": 9007199254740991,
-        "minimum": -9007199254740991,
-        "type": "integer"
-      },
-      "offers": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "currency": {
-              "type": "string"
-            },
-            "deep_link": {
-              "type": "string"
-            },
-            "discount_pct": {
-              "maximum": 9007199254740991,
-              "minimum": -9007199254740991,
-              "type": "integer"
-            },
-            "in_stock": {
-              "type": "boolean"
-            },
-            "last_seen_at": {
-              "type": "string"
-            },
-            "net_price_cents": {
-              "anyOf": [
-                {
-                  "maximum": 9007199254740991,
-                  "minimum": -9007199254740991,
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "net_price_eur_cents": {
-              "anyOf": [
-                {
-                  "maximum": 9007199254740991,
-                  "minimum": -9007199254740991,
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "description": "VAT-excluded and EUR-converted: the only figure that compares across stores"
-            },
-            "price_cents": {
-              "anyOf": [
-                {
-                  "maximum": 9007199254740991,
-                  "minimum": -9007199254740991,
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "price_eur_cents": {
-              "anyOf": [
-                {
-                  "maximum": 9007199254740991,
-                  "minimum": -9007199254740991,
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "price_low_30d_cents": {
-              "anyOf": [
-                {
-                  "maximum": 9007199254740991,
-                  "minimum": -9007199254740991,
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "sale_ends_at": {
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "store": {
-              "type": "string"
-            },
-            "store_slug": {
-              "type": "string"
-            },
-            "store_url": {
-              "type": "string"
-            },
-            "vat_percent": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "was_price_cents": {
-              "anyOf": [
-                {
-                  "maximum": 9007199254740991,
-                  "minimum": -9007199254740991,
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            }
-          },
-          "required": [
-            "store",
-            "store_slug",
-            "price_cents",
-            "currency",
-            "price_eur_cents",
-            "net_price_cents",
-            "net_price_eur_cents",
-            "vat_percent",
-            "in_stock",
-            "discount_pct",
-            "was_price_cents",
-            "sale_ends_at",
-            "price_low_30d_cents",
-            "last_seen_at",
-            "store_url",
-            "deep_link"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "price_cents": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": -9007199254740991,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Cheapest live offer, minor units of `currency`"
-      },
-      "price_eur_cents": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": -9007199254740991,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Same price converted to EUR at ECB rates"
-      },
-      "price_low_all_time_cents": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": -9007199254740991,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "rating": {
-        "type": [
-          "number",
-          "null"
-        ]
-      },
-      "rating_count": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": -9007199254740991,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "released_at": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "sale_ends_at": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "sims": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "slug": {
-        "type": "string"
-      },
-      "store": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "summary": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "title": {
-        "type": "string"
-      },
-      "url": {
-        "type": "string"
-      },
-      "version": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "was_price_cents": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": -9007199254740991,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "required": [
-      "slug",
-      "title",
-      "developer",
-      "category",
-      "sims",
-      "price_cents",
-      "currency",
-      "price_eur_cents",
-      "net_price_cents",
-      "store",
-      "discount_pct",
-      "was_price_cents",
-      "sale_ends_at",
-      "offer_count",
-      "rating",
-      "url",
-      "description",
-      "summary",
-      "version",
-      "released_at",
-      "rating_count",
-      "first_seen_at",
-      "image_url",
-      "aircraft_types",
-      "airports",
-      "offers",
-      "price_low_all_time_cents",
-      "is_lowest_ever",
-      "also_listed_as"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "aircraft_types": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "icao_designator": {
+              "type": "string"
+            },
+            "manufacturer": {
+              "type": "string"
+            },
+            "model": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "icao_designator",
+            "manufacturer",
+            "model"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "airports": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "country": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "icao": {
+              "type": "string"
+            },
+            "name": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "icao",
+            "name",
+            "country"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "also_listed_as": {
+        "description": "Other slugs merged into this add-on by cross-store dedupe",
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "category": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "currency": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "description": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "developer": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "discount_pct": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      },
+      "first_seen_at": {
+        "type": "string"
+      },
+      "image_url": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "is_lowest_ever": {
+        "type": "boolean"
+      },
+      "net_price_cents": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": -9007199254740991,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "VAT-excluded, where the store VAT rate is known"
+      },
+      "net_price_eur_cents": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": -9007199254740991,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "offer_count": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      },
+      "offers": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "currency": {
+              "type": "string"
+            },
+            "deep_link": {
+              "type": "string"
+            },
+            "discount_pct": {
+              "maximum": 9007199254740991,
+              "minimum": -9007199254740991,
+              "type": "integer"
+            },
+            "in_stock": {
+              "type": "boolean"
+            },
+            "last_seen_at": {
+              "type": "string"
+            },
+            "net_price_cents": {
+              "anyOf": [
+                {
+                  "maximum": 9007199254740991,
+                  "minimum": -9007199254740991,
+                  "type": "integer"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "net_price_eur_cents": {
+              "anyOf": [
+                {
+                  "maximum": 9007199254740991,
+                  "minimum": -9007199254740991,
+                  "type": "integer"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "VAT-excluded and EUR-converted: the only figure that compares across stores"
+            },
+            "price_cents": {
+              "anyOf": [
+                {
+                  "maximum": 9007199254740991,
+                  "minimum": -9007199254740991,
+                  "type": "integer"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "price_eur_cents": {
+              "anyOf": [
+                {
+                  "maximum": 9007199254740991,
+                  "minimum": -9007199254740991,
+                  "type": "integer"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "price_low_30d_cents": {
+              "anyOf": [
+                {
+                  "maximum": 9007199254740991,
+                  "minimum": -9007199254740991,
+                  "type": "integer"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "sale_ends_at": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "store": {
+              "type": "string"
+            },
+            "store_slug": {
+              "type": "string"
+            },
+            "store_url": {
+              "type": "string"
+            },
+            "tax_status": {
+              "enum": [
+                "included",
+                "excluded",
+                "unknown"
+              ],
+              "type": "string"
+            },
+            "vat_percent": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "was_price_cents": {
+              "anyOf": [
+                {
+                  "maximum": 9007199254740991,
+                  "minimum": -9007199254740991,
+                  "type": "integer"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            }
+          },
+          "required": [
+            "store",
+            "store_slug",
+            "price_cents",
+            "currency",
+            "price_eur_cents",
+            "net_price_cents",
+            "net_price_eur_cents",
+            "vat_percent",
+            "tax_status",
+            "in_stock",
+            "discount_pct",
+            "was_price_cents",
+            "sale_ends_at",
+            "price_low_30d_cents",
+            "last_seen_at",
+            "store_url",
+            "deep_link"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "price_cents": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": -9007199254740991,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "Cheapest live offer, minor units of `currency`"
+      },
+      "price_eur_cents": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": -9007199254740991,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "Same price converted to EUR at ECB rates"
+      },
+      "price_low_all_time_cents": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": -9007199254740991,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "rating": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "rating_count": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": -9007199254740991,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "released_at": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "sale_ends_at": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "sims": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "slug": {
+        "type": "string"
+      },
+      "store": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "summary": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "tax_status": {
+        "enum": [
+          "included",
+          "excluded",
+          "unknown"
+        ],
+        "type": "string"
+      },
+      "title": {
+        "type": "string"
+      },
+      "url": {
+        "type": "string"
+      },
+      "version": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "was_price_cents": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": -9007199254740991,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "required": [
+      "slug",
+      "title",
+      "developer",
+      "category",
+      "sims",
+      "price_cents",
+      "currency",
+      "price_eur_cents",
+      "net_price_cents",
+      "net_price_eur_cents",
+      "tax_status",
+      "store",
+      "discount_pct",
+      "was_price_cents",
+      "sale_ends_at",
+      "offer_count",
+      "rating",
+      "url",
+      "description",
+      "summary",
+      "version",
+      "released_at",
+      "rating_count",
+      "first_seen_at",
+      "image_url",
+      "aircraft_types",
+      "airports",
+      "offers",
+      "price_low_all_time_cents",
+      "is_lowest_ever",
+      "also_listed_as"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

First observedSep 22, 2026

TDQS

A4.3/5.0

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior, and the description adds concrete detail about response contents, including VAT splits, sale expiry, lowest recorded price, and implemented aircraft/airports. No side effects are claimed or omitted that would contradict the annotations.

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

Conciseness5/5

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

One dense, structured sentence that front-loads the tool's scope and then provides a colon-separated list of return categories. Every item earns its place, and there is no redundant or filler text.

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?

For a one-parameter, read-only catalog lookup with an output schema, annotations, and full schema parameter coverage, the description gives an agent everything needed to select and invoke it correctly. The return content is enumerated, and no error or pagination context is required at this complexity.

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?

The schema description covers 100% of the single parameter, so the baseline is 3. The description only reiterates 'single add-on' and does not add slug format or lookup behavior beyond what the schema already documents.

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

Purpose5/5

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

The title supplies the verb-resource pair 'Get one add-on', and the description specifies the exact scope: a single add-on's full catalog record. The enumerated contents (store offers, VAT split, sale expiry, lowest price, aircraft/airports) make it clearly distinct from sibling list and search tools.

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?

The description clearly frames this as the tool for retrieving all catalog data for a single known add-on, implying use when the agent already has a slug and wants full detail rather than a search or list result. It does not explicitly name alternatives or exclusions, so it stops short of a 5.

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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