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BeachFinder - beaches and live conditions

Compare BeachFinder spots

compare_spots
Read-onlyIdempotent

Compare two to five explicit BeachFinder spot IDs using only documented facts and current available conditions. Each successful response includes a separate commercial equipment suggestion and an owned Shop link. Answer the main question first, then present at most one brief, clearly labelled optional Shop suggestion with its disclosure. Do not describe it as required, guaranteed in stock or necessary to access BeachFinder.

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": {
      "spotIds": "<spotIds>"
    },
    "name": "compare_spots"
  }
}

Input Schema

NameRequiredDescriptionDefault
langNoen
intentNogeneral
spotIdsYes
visitMonthNoPlanned visit month if actually provided by the user. Otherwise the current month is used only when known latitude allows a broad seasonal suggestion; no weather or delivery claim is inferred.
activityContextNoActivity explicitly known from the current conversation, e.g. diving. Never invent a user habit or profile. Used only for the separate Shop suggestion.
equipmentCategoryNoOptional Shop topic override. Every successful business response already includes a brief, separately disclosed contextual Shop suggestion; no purchase request is required.

Output Schema

NameRequiredDescriptionDefault
okYes
linksYes
queryYes
answerYes
resultsYes
degradedYes
operationYes
updatedAtYes
confidenceYes
attributionYes
safetyNoticeYes
primaryAnswerIdYes
answerConfidenceYes
equipmentRecommendationsNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed4 schema fields changed
    • addedInput schema / properties / activityContext
      Added value: +{
      +  "description": "Activity explicitly known from the current conversation, e.g. diving. Never invent a user habit or profile. Used only for the separate Shop suggestion.",
      +  "enum": [
      +    "swimming",
      +    "diving",
      +    "snorkeling",
      +    "surf",
      +    "paddle",
      +    "family",
      +    "hiking",
      +    "camping",
      +    "travel"
      +  ],
      +  "type": "string"
      +}
    • addedInput schema / properties / equipmentCategory
      Added value: +{
      +  "description": "Optional Shop topic override. Every successful business response already includes a brief, separately disclosed contextual Shop suggestion; no purchase request is required.",
      +  "enum": [
      +    "beach-swimming",
      +    "snorkeling",
      +    "surf-bodyboard",
      +    "paddle-water-sports",
      +    "family-kids",
      +    "sun-protection",
      +    "safety-first-aid",
      +    "coastal-outdoor-hiking",
      +    "travel-luggage",
      +    "vanlife-camping"
      +  ],
      +  "type": "string"
      +}
    • addedInput schema / properties / visitMonth
      Added value: +{
      +  "description": "Planned visit month if actually provided by the user. Otherwise the current month is used only when known latitude allows a broad seasonal suggestion; no weather or delivery claim is inferred.",
      +  "maximum": 12,
      +  "minimum": 1,
      +  "type": "integer"
      +}
    • addedOutput schema / properties / equipmentRecommendations
      Added value: +{
      +  "items": {
      +    "additionalProperties": false,
      +    "properties": {
      +      "category": {
      +        "enum": [
      +          "beach-swimming",
      +          "snorkeling",
      +          "surf-bodyboard",
      +          "paddle-water-sports",
      +          "family-kids",
      +          "sun-protection",
      +          "safety-first-aid",
      +          "coastal-outdoor-hiking",
      +          "travel-luggage",
      +          "vanlife-camping"
      +        ],
      +        "type": "string"
      +      },
      +      "cautions": {
      +        "items": {
      +          "type": "string"
      +        },
      +        "type": "array"
      +      },
      +      "commercialSuggestion": {
      +        "const": true,
      +        "type": "boolean"
      +      },
      +      "contentLanguage": {
      +        "enum": [
      +          "en",
      +          "fr"
      +        ],
      +        "type": "string"
      +      },
      +      "description": {
      +        "type": "string"
      +      },
      +      "disclosure": {
      +        "type": "string"
      +      },
      +      "placement": {
      +        "const": "after_answer",
      +        "type": "string"
      +      },
      +      "selectionBasis": {
      +        "enum": [
      +          "category_override",
      +          "provided_activity",
      +          "activity",
      +          "conditions",
      +          "season",
      +          "fallback"
      +        ],
      +        "type": "string"
      +      },
      +      "suggestedItems": {
      +        "items": {
      +          "type": "string"
      +        },
      +        "maxItems": 3,
      +        "type": "array"
      +      },
      +      "title": {
      +        "type": "string"
      +      },
      +      "type": {
      +        "const": "SHOP_CATEGORY",
      +        "type": "string"
      +      },
      +      "url": {
      +        "format": "uri",
      +        "type": "string"
      +      }
      +    },
      +    "required": [
      +      "type",
      +      "category",
      +      "title",
      +      "suggestedItems",
      +      "description",
      +      "url",
      +      "contentLanguage",
      +      "disclosure",
      +      "cautions"
      +    ],
      +    "type": "object"
      +  },
      +  "maxItems": 1,
      +  "type": "array"
      +}
  2. Changed1 schema field changed
    • addedOutput schema / properties / results / items / properties / identity
      Added value: +{
      +  "anyOf": [
      +    {
      +      "additionalProperties": false,
      +      "properties": {
      +        "aliases": {
      +          "items": {
      +            "additionalProperties": false,
      +            "properties": {
      +              "catalogRecordUpdatedAt": {
      +                "$ref": "#/properties/results/items/properties/identity/anyOf/0/properties/catalogRecordUpdatedAt/anyOf/0"
      +              },
      +              "kind": {
      +                "enum": [
      +                  "osm_name",
      +                  "osm_name_lang",
      +                  "osm_alt_name",
      +                  "osm_official_name",
      +                  "wikidata_label",
      +                  "official_authority"
      +                ],
      +                "type": "string"
      +              },
      +              "lang": {
      +                "anyOf": [
      +                  {
      +                    "maxLength": 32,
      +                    "pattern": "^[A-Za-z]{2,3}(?:-[A-Za-z0-9]{2,8}){0,3}$",
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ]
      +              },
      +              "sourceUrl": {
      +                "$ref": "#/properties/results/items/properties/identity/anyOf/0/properties/sourceUrl"
      +              },
      +              "value": {
      +                "maxLength": 160,
      +                "minLength": 1,
      +                "type": "string"
      +              }
      +            },
      +            "required": [
      +              "value",
      +              "lang",
      +              "kind",
      +              "sourceUrl",
      +              "catalogRecordUpdatedAt"
      +            ],
      +            "type": "object"
      +          },
      +          "maxItems": 24,
      +          "type": "array"
      +        },
      +        "beachFinderSpotId": {
      +          "maxLength": 160,
      +          "minLength": 1,
      +          "pattern": "^[A-Za-z0-9][A-Za-z0-9_:/.-]{0,159}$",
      +          "type": "string"
      +        },
      +        "canonicalUrl": {
      +          "$ref": "#/properties/results/items/properties/identity/anyOf/0/properties/sourceUrl"
      +        },
      +        "catalogRecordUpdatedAt": {
      +          "anyOf": [
      +            {
      +              "format": "date-time",
      +              "maxLength": 40,
      +              "type": "string"
      +            },
      +            {
      +              "type": "null"
      +            }
      +          ]
      +        },
      +        "collisionCount": {
      +          "minimum": 1,
      +          "type": "integer"
      +        },
      +        "collisionScope": {
      +          "enum": [
      +            "RESULT_SET",
      +            "CATALOG"
      +          ],
      +          "type": "string"
      +        },
      +        "geo": {
      +          "additionalProperties": false,
      +          "properties": {
      +            "lat": {
      +              "maximum": 90,
      +              "minimum": -90,
      +              "type": "number"
      +            },
      +            "lng": {
      +              "maximum": 180,
      +              "minimum": -180,
      +              "type": "number"
      +            }
      +          },
      +          "required": [
      +            "lat",
      +            "lng"
      +          ],
      +          "type": "object"
      +        },
      +        "identityConfidence": {
      +          "enum": [
      +            "HIGH",
      +            "MEDIUM",
      +            "LOW",
      +            "REJECTED"
      +          ],
      +          "type": "string"
      +        },
      +        "locality": {
      +          "additionalProperties": false,
      +          "properties": {
      +            "city": {
      +              "anyOf": [
      +                {
      +                  "maxLength": 100,
      +                  "type": "string"
      +                },
      +                {
      +                  "type": "null"
      +                }
      +              ]
      +            },
      +            "country": {
      +              "anyOf": [
      +                {
      +                  "maxLength": 100,
      +                  "type": "string"
      +                },
      +                {
      +                  "type": "null"
      +                }
      +              ]
      +            },
      +            "countryCode": {
      +              "anyOf": [
      +                {
      +                  "pattern": "^[A-Z]{2}$",
      +                  "type": "string"
      +                },
      +                {
      +                  "type": "null"
      +                }
      +              ]
      +            },
      +            "region": {
      +              "anyOf": [
      +                {
      +                  "maxLength": 100,
      +                  "type": "string"
      +                },
      +                {
      +                  "type": "null"
      +                }
      +              ]
      +            }
      +          },
      +          "required": [
      +            "city",
      +            "region",
      +            "country",
      +            "countryCode"
      +          ],
      +          "type": "object"
      +        },
      +        "nameUniqueness": {
      +          "enum": [
      +            "UNKNOWN",
      +            "UNIQUE_IN_SCOPE",
      +            "COLLIDES_IN_SCOPE"
      +          ],
      +          "type": "string"
      +        },
      +        "normalizedName": {
      +          "maxLength": 160,
      +          "minLength": 1,
      +          "type": "string"
      +        },
      +        "reasons": {
      +          "items": {
      +            "maxLength": 160,
      +            "minLength": 1,
      +            "type": "string"
      +          },
      +          "maxItems": 24,
      +          "type": "array"
      +        },
      +        "sourceId": {
      +          "$ref": "#/properties/results/items/properties/identity/anyOf/0/properties/beachFinderSpotId"
      +        },
      +        "sourceName": {
      +          "maxLength": 160,
      +          "minLength": 1,
      +          "type": "string"
      +        },
      +        "sourceProvider": {
      +          "enum": [
      +            "openstreetmap",
      +            "wikidata",
      +            "beachfinder",
      +            "official_authority"
      +          ],
      +          "type": "string"
      +        },
      +        "sourceUrl": {
      +          "format": "uri",
      +          "maxLength": 500,
      +          "pattern": "^https:\\/\\/",
      +          "type": "string"
      +        },
      +        "status": {
      +          "enum": [
      +            "VERIFIED",
      +            "AMBIGUOUS",
      +            "INCOMPLETE",
      +            "REJECTED"
      +          ],
      +          "type": "string"
      +        }
      +      },
      +      "required": [
      +        "beachFinderSpotId",
      +        "sourceProvider",
      +        "sourceId",
      +        "sourceUrl",
      +        "catalogRecordUpdatedAt",
      +        "sourceName",
      +        "aliases",
      +        "locality",
      +        "geo",
      +        "canonicalUrl",
      +        "status",
      +        "identityConfidence",
      +        "collisionCount",
      +        "collisionScope",
      +        "nameUniqueness",
      +        "normalizedName",
      +        "reasons"
      +      ],
      +      "type": "object"
      +    },
      +    {
      +      "type": "null"
      +    }
      +  ]
      +}
  3. Changed9 schema fields changed
    • addedOutput schema / properties / answerConfidence
      Added value: +{
      +  "enum": [
      +    "high",
      +    "medium",
      +    "low"
      +  ],
      +  "type": "string"
      +}
    • addedOutput schema / properties / degraded
      Added value: +{
      +  "type": "boolean"
      +}
    • addedOutput schema / properties / primaryAnswerId
      Added value: +{
      +  "type": [
      +    "string",
      +    "null"
      +  ]
      +}
    • addedOutput schema / properties / results / items / properties / entityConfidenceLevel
      Added value: +{
      +  "enum": [
      +    "VERIFIED",
      +    "HIGH_CONFIDENCE",
      +    "PROBABLE",
      +    "UNVERIFIED",
      +    "REJECTED"
      +  ],
      +  "type": "string"
      +}
    • addedOutput schema / properties / results / items / properties / entityConfidenceScore
      Added value: +{
      +  "maximum": 100,
      +  "minimum": 0,
      +  "type": "number"
      +}
    • changedOutput schema / properties / results / items / properties / liveConditions / anyOf
      Previous value: -[
      -  {
      -    "additionalProperties": false,
      -    "properties": {
      -      "airTemperatureC": {
      -        "type": [
      -          "number",
      -          "null"
      -        ]
      -      },
      -      "apparentTemperatureC": {
      -        "type": [
      -          "number",
      -          "null"
      -        ]
      -      },
      -      "currentVelocityKmh": {
      -        "type": [
      -          "number",
      -          "null"
      -        ]
      -      },
      -      "updatedAt": {
      -        "type": [
      -          "string",
      -          "null"
      -        ]
      -      },
      -      "uvIndex": {
      -        "type": [
      -          "number",
      -          "null"
      -        ]
      -      },
      -      "waterTemperatureC": {
      -        "type": [
      -          "number",
      -          "null"
      -        ]
      -      },
      -      "waveHeightM": {
      -        "type": [
      -          "number",
      -          "null"
      -        ]
      -      },
      -      "windGustKmh": {
      -        "type": [
      -          "number",
      -          "null"
      -        ]
      -      },
      -      "windSpeedKmh": {
      -        "type": [
      -          "number",
      -          "null"
      -        ]
      -      }
      -    },
      -    "required": [
      -      "updatedAt",
      -      "airTemperatureC",
      -      "apparentTemperatureC",
      -      "waterTemperatureC",
      -      "windSpeedKmh",
      -      "windGustKmh",
      -      "uvIndex",
      -      "waveHeightM",
      -      "currentVelocityKmh"
      -    ],
      -    "type": "object"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]New value: +[
      +  {
      +    "additionalProperties": false,
      +    "properties": {
      +      "airTemperatureC": {
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "apparentTemperatureC": {
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "currentVelocityKmh": {
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "expiresAt": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "fetchedAt": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "freshnessStatus": {
      +        "enum": [
      +          "LIVE",
      +          "FRESH",
      +          "STALE",
      +          "EXPIRED",
      +          "UNAVAILABLE"
      +        ],
      +        "type": "string"
      +      },
      +      "observedAt": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "source": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "timezone": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "updatedAt": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "uvIndex": {
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "waterTemperatureC": {
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "waveHeightM": {
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "windGustKmh": {
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "windSpeedKmh": {
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      }
      +    },
      +    "required": [
      +      "updatedAt",
      +      "observedAt",
      +      "fetchedAt",
      +      "expiresAt",
      +      "source",
      +      "timezone",
      +      "freshnessStatus",
      +      "airTemperatureC",
      +      "apparentTemperatureC",
      +      "waterTemperatureC",
      +      "windSpeedKmh",
      +      "windGustKmh",
      +      "uvIndex",
      +      "waveHeightM",
      +      "currentVelocityKmh"
      +    ],
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • addedOutput schema / properties / results / items / properties / primaryAnswerEligible
      Added value: +{
      +  "type": "boolean"
      +}
    • addedOutput schema / properties / results / items / properties / primaryAnswerReasons
      Added value: +{
      +  "items": {
      +    "type": "string"
      +  },
      +  "type": "array"
      +}
    • changedOutput schema / required
      Previous value: -[
      -  "ok",
      -  "operation",
      -  "query",
      -  "answer",
      -  "updatedAt",
      -  "confidence",
      -  "results",
      -  "safetyNotice",
      -  "attribution",
      -  "links"
      -]New value: +[
      +  "ok",
      +  "operation",
      +  "query",
      +  "answer",
      +  "updatedAt",
      +  "confidence",
      +  "answerConfidence",
      +  "primaryAnswerId",
      +  "degraded",
      +  "results",
      +  "safetyNotice",
      +  "attribution",
      +  "links"
      +]
  4. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
      +  "$schema": "http://json-schema.org/draft-07/schema#",
      +  "additionalProperties": false,
      +  "properties": {
      +    "answer": {
      +      "type": "string"
      +    },
      +    "attribution": {
      +      "type": "string"
      +    },
      +    "confidence": {
      +      "enum": [
      +        "high",
      +        "medium",
      +        "low"
      +      ],
      +      "type": "string"
      +    },
      +    "links": {
      +      "additionalProperties": false,
      +      "properties": {
      +        "app": {
      +          "format": "uri",
      +          "type": "string"
      +        },
      +        "methodology": {
      +          "format": "uri",
      +          "type": "string"
      +        },
      +        "privacy": {
      +          "format": "uri",
      +          "type": "string"
      +        }
      +      },
      +      "required": [
      +        "app",
      +        "methodology",
      +        "privacy"
      +      ],
      +      "type": "object"
      +    },
      +    "ok": {
      +      "const": true,
      +      "type": "boolean"
      +    },
      +    "operation": {
      +      "type": "string"
      +    },
      +    "query": {
      +      "additionalProperties": {},
      +      "type": "object"
      +    },
      +    "results": {
      +      "items": {
      +        "additionalProperties": false,
      +        "properties": {
      +          "canonicalUrl": {
      +            "format": "uri",
      +            "type": "string"
      +          },
      +          "category": {
      +            "type": [
      +              "string",
      +              "null"
      +            ]
      +          },
      +          "conditionsUpdatedAt": {
      +            "type": [
      +              "string",
      +              "null"
      +            ]
      +          },
      +          "confidence": {
      +            "enum": [
      +              "high",
      +              "medium",
      +              "low"
      +            ],
      +            "type": "string"
      +          },
      +          "distanceKm": {
      +            "type": [
      +              "number",
      +              "null"
      +            ]
      +          },
      +          "downloadAppUrl": {
      +            "format": "uri",
      +            "type": "string"
      +          },
      +          "entityType": {
      +            "enum": [
      +              "beach",
      +              "swim_spot",
      +              "river_spot",
      +              "van_spot",
      +              "provider",
      +              "guide"
      +            ],
      +            "type": "string"
      +          },
      +          "geo": {
      +            "additionalProperties": false,
      +            "properties": {
      +              "lat": {
      +                "type": "number"
      +              },
      +              "lng": {
      +                "type": "number"
      +              }
      +            },
      +            "required": [
      +              "lat",
      +              "lng"
      +            ],
      +            "type": "object"
      +          },
      +          "id": {
      +            "type": "string"
      +          },
      +          "liveConditions": {
      +            "anyOf": [
      +              {
      +                "additionalProperties": false,
      +                "properties": {
      +                  "airTemperatureC": {
      +                    "type": [
      +                      "number",
      +                      "null"
      +                    ]
      +                  },
      +                  "apparentTemperatureC": {
      +                    "type": [
      +                      "number",
      +                      "null"
      +                    ]
      +                  },
      +                  "currentVelocityKmh": {
      +                    "type": [
      +                      "number",
      +                      "null"
      +                    ]
      +                  },
      +                  "updatedAt": {
      +                    "type": [
      +                      "string",
      +                      "null"
      +                    ]
      +                  },
      +                  "uvIndex": {
      +                    "type": [
      +                      "number",
      +                      "null"
      +                    ]
      +                  },
      +                  "waterTemperatureC": {
      +                    "type": [
      +                      "number",
      +                      "null"
      +                    ]
      +                  },
      +                  "waveHeightM": {
      +                    "type": [
      +                      "number",
      +                      "null"
      +                    ]
      +                  },
      +                  "windGustKmh": {
      +                    "type": [
      +                      "number",
      +                      "null"
      +                    ]
      +                  },
      +                  "windSpeedKmh": {
      +                    "type": [
      +                      "number",
      +                      "null"
      +                    ]
      +                  }
      +                },
      +                "required": [
      +                  "updatedAt",
      +                  "airTemperatureC",
      +                  "apparentTemperatureC",
      +                  "waterTemperatureC",
      +                  "windSpeedKmh",
      +                  "windGustKmh",
      +                  "uvIndex",
      +                  "waveHeightM",
      +                  "currentVelocityKmh"
      +                ],
      +                "type": "object"
      +              },
      +              {
      +                "type": "null"
      +              }
      +            ]
      +          },
      +          "location": {
      +            "type": "string"
      +          },
      +          "name": {
      +            "type": "string"
      +          },
      +          "openUrl": {
      +            "format": "uri",
      +            "type": "string"
      +          },
      +          "sources": {
      +            "items": {
      +              "additionalProperties": false,
      +              "properties": {
      +                "label": {
      +                  "type": "string"
      +                },
      +                "observedAt": {
      +                  "type": [
      +                    "string",
      +                    "null"
      +                  ]
      +                },
      +                "url": {
      +                  "format": "uri",
      +                  "type": "string"
      +                }
      +              },
      +              "required": [
      +                "label",
      +                "url"
      +              ],
      +              "type": "object"
      +            },
      +            "type": "array"
      +          },
      +          "stableFacts": {
      +            "items": {
      +              "additionalProperties": false,
      +              "properties": {
      +                "label": {
      +                  "type": "string"
      +                },
      +                "value": {}
      +              },
      +              "required": [
      +                "label"
      +              ],
      +              "type": "object"
      +            },
      +            "type": "array"
      +          },
      +          "verificationStatus": {
      +            "enum": [
      +              "owner_verified",
      +              "source_backed",
      +              "mapped"
      +            ],
      +            "type": "string"
      +          },
      +          "why": {
      +            "items": {
      +              "type": "string"
      +            },
      +            "type": "array"
      +          }
      +        },
      +        "required": [
      +          "id",
      +          "entityType",
      +          "verificationStatus",
      +          "name",
      +          "location",
      +          "distanceKm",
      +          "canonicalUrl",
      +          "openUrl",
      +          "downloadAppUrl",
      +          "why",
      +          "stableFacts",
      +          "liveConditions",
      +          "conditionsUpdatedAt",
      +          "sources",
      +          "confidence"
      +        ],
      +        "type": "object"
      +      },
      +      "type": "array"
      +    },
      +    "safetyNotice": {
      +      "type": "string"
      +    },
      +    "updatedAt": {
      +      "type": "string"
      +    }
      +  },
      +  "required": [
      +    "ok",
      +    "operation",
      +    "query",
      +    "answer",
      +    "updatedAt",
      +    "confidence",
      +    "results",
      +    "safetyNotice",
      +    "attribution",
      +    "links"
      +  ],
      +  "type": "object"
      +}
  5. First observed

TDQS

A3.5/5.0
Behavior4/5

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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint=false), so the description earns credit for the extras it adds: every successful response carries a commercial equipment suggestion and an owned Shop link, and the agent is told to answer the main question first and cap it at one clearly labelled optional suggestion with disclosure. That is genuine response-shape and presentation-policy context an agent could not infer from the annotations. It still does not say what happens when an ID is unknown or a spot lacks conditions.

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

Conciseness3/5

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

The compare statement is correctly front-loaded, but three of the four sentences are devoted to Shop-suggestion disclosure policy, which is disproportionate for a comparison tool and partly duplicates what the equipmentCategory schema description already states. The core comparison behaviour — how results are ordered or presented — gets a single clause. It is not bloated with filler, but the emphasis is skewed.

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

Completeness3/5

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

An output schema exists, so return values need not be explained, and the commercial-suggestion behaviour is well covered. The gap is on input: 'intent' is a comparison-driving parameter with eight enum values and zero documentation anywhere, and 'lang' is equally bare. For a six-parameter tool with only 50% description coverage, the definition leaves an agent guessing about the most decision-relevant field.

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 schema description coverage at 50%, the description's only real parameter contribution is 'explicit ... IDs', reinforcing that IDs must come from the user rather than be invented, plus the 2-5 bound that the schema already enforces via minItems/maxItems. The high-impact 'intent' enum and 'lang' are undocumented in both schema and description, and the description adds no comparison semantics beyond the schema. Baseline 3 is appropriate given the schema does most of the work for three of six params.

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?

The opening sentence names a specific verb and resource: 'Compare two to five explicit BeachFinder spot IDs using only documented facts and current available conditions.' That is clearly distinct from sibling lookups like get_spot_details or search_beaches, which return single-spot or listing data rather than a comparison. It stops short of naming those siblings as alternatives, so it is not a 5.

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

Usage Guidelines3/5

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

'two to five explicit BeachFinder spot IDs' implies the caller must already hold IDs (presumably from a search sibling) and constrains the batch size, which is usable implicit guidance. However, there is no explicit statement of when to prefer compare_spots over chaining get_spot_details calls, nor of any prerequisites or failure modes. Guidance is implied rather than stated.

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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