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DC Hub: Data Center, Power Grid & Energy Intelligence

Search Facilities

search_facilities
Read-onlyIdempotent

Filter data centers by country, state, city, operator, capacity, or tier to find facilities matching your criteria; results show verification status and disclosed specs.

Instructions

Use this when the user asks which data centers exist, or who operates in a city, state or country; filters: country, state, city, operator, MW range, tier or text. Returns name, operator, location, market, status and MW where disclosed; each row is flagged verified or unverified_directory_listing. Free: names and locations; MW and specs need a paid key. Ex: "Equinix sites in Virginia over 10 MW." Start here for a facility slug. No match = empty data, not an error: broaden filters. limit 1-500 (free tier 25); page with offset.

Input Schema

NameRequiredDescriptionDefault
cityNoCity name to filter facilities, e.g. Ashburn, Dallas
tierNoUptime Institute tier filter (1-4)
limitNoMax results to return (1-500; default varies by tool)
queryNoFree-text search over facility name/operator/location (mapped to the backend `q` param), e.g. "hyperscale Ashburn"
stateNoUS state abbreviation or region, e.g. VA, TX
offsetNoPagination offset, 0-based (skip this many results)
countryNoISO 3166-1 alpha-2 country code, e.g. US, GB, SG
operatorNoOperator/provider company name, e.g. Equinix, Digital Realty
max_capacity_mwNoMaximum power capacity filter in megawatts (MW)
min_capacity_mwNoMinimum power capacity filter in megawatts (MW)

Output Schema

NameRequiredDescriptionDefault
dataNo
noteNo
tierNo
countNo
successNo
total_matchingNo
full_results_availableNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed23 schema fields changedv2.12.45
    • changedOutput schema / additionalProperties
      Previous value: -{}New value: +true
    • removedOutput schema / description
      Removed value: -"Facility search results: `data` rows (name, provider, location, capacity on fuller tiers) alongside the DC Hub envelope keys."
    • removedOutput schema / properties / _entity
      Removed value: -{
      -  "description": "Payload class (facility|market|iso_grid|queue_results|deal|report|response); branch on it.",
      -  "type": "string"
      -}
    • removedOutput schema / properties / _front_door
      Removed value: -{
      -  "additionalProperties": {},
      -  "description": "First-tool hint: plan_query(intent) returns the ordered plan.",
      -  "properties": {},
      -  "type": "object"
      -}
    • removedOutput schema / properties / _return_loop
      Removed value: -{
      -  "additionalProperties": {},
      -  "description": "Next-session delta call (get_changes).",
      -  "properties": {},
      -  "type": "object"
      -}
    • removedOutput schema / properties / citation
      Removed value: -{
      -  "anyOf": [
      -    {
      -      "additionalProperties": {},
      -      "properties": {},
      -      "type": "object"
      -    },
      -    {
      -      "type": "string"
      -    }
      -  ],
      -  "description": "How to attribute DC Hub: {source, url, license, cite_as, retrieved_at}, or the attribution line as a string."
      -}
    • removedOutput schema / properties / count / anyOf
      Removed value: -[
      -  {
      -    "anyOf": [
      -      {
      -        "type": "number"
      -      },
      -      {
      -        "type": "string"
      -      }
      -    ]
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • removedOutput schema / properties / count / description
      Removed value: -"Rows returned in THIS response (null on some gated tiers)"
    • removedOutput schema / properties / data / anyOf
      Removed value: -[
      -  {
      -    "items": {
      -      "additionalProperties": {},
      -      "properties": {
      -        "city": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "City"
      -        },
      -        "country": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "ISO-2 country code"
      -        },
      -        "country_name": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "Country full name"
      -        },
      -        "id": {
      -          "anyOf": [
      -            {
      -              "anyOf": [
      -                {
      -                  "type": "number"
      -                },
      -                {
      -                  "type": "string"
      -                }
      -              ]
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "Facility id"
      -        },
      -        "lat": {
      -          "anyOf": [
      -            {
      -              "anyOf": [
      -                {
      -                  "type": "number"
      -                },
      -                {
      -                  "type": "string"
      -                }
      -              ]
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "Latitude (fuller tiers)"
      -        },
      -        "location_display": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "Pre-formatted \"City, State, Country\" line"
      -        },
      -        "lon": {
      -          "anyOf": [
      -            {
      -              "anyOf": [
      -                {
      -                  "type": "number"
      -                },
      -                {
      -                  "type": "string"
      -                }
      -              ]
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "Longitude (fuller tiers)"
      -        },
      -        "market_slug": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "Market slug — feed to get_market_intel / get_market_dcpi_rank (fuller tiers)"
      -        },
      -        "name": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "Facility name"
      -        },
      -        "power_mw": {
      -          "anyOf": [
      -            {
      -              "anyOf": [
      -                {
      -                  "type": "number"
      -                },
      -                {
      -                  "type": "string"
      -                }
      -              ]
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "Power capacity in MW (fuller tiers)"
      -        },
      -        "profile_url": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "dchub.cloud facility page"
      -        },
      -        "provider": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "Operator / provider company"
      -        },
      -        "slug": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "URL slug — feed to get_facility for the full profile"
      -        },
      -        "state": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "State/region code"
      -        },
      -        "state_name": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "State/region full name"
      -        },
      -        "status": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "operational | under-construction | planned (fuller tiers)"
      -        },
      -        "v": {
      -          "anyOf": [
      -            {
      -              "type": "string"
      -            },
      -            {
      -              "type": "null"
      -            }
      -          ],
      -          "description": "Per-record verification flag: verified | tracked | published | inferred"
      -        }
      -      },
      -      "type": "object"
      -    },
      -    "type": "array"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • removedOutput schema / properties / data / description
      Removed value: -"Facility rows matching the filters"
    • removedOutput schema / properties / full_results_available / anyOf
      Removed value: -[
      -  {
      -    "type": "boolean"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • removedOutput schema / properties / full_results_available / description
      Removed value: -"false when the row set was trimmed for your tier"
    • removedOutput schema / properties / note / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • removedOutput schema / properties / note / description
      Removed value: -"Serving note (e.g. how many rows the full tier returns)"
    • removedOutput schema / properties / provenance
      Removed value: -{
      -  "additionalProperties": {},
      -  "description": "Source, method, as_of, verification_counts, license, cite_as; quote it when citing.",
      -  "properties": {},
      -  "type": "object"
      -}
    • removedOutput schema / properties / quota
      Removed value: -{
      -  "additionalProperties": {},
      -  "description": "Caller quota state (remaining calls, tier).",
      -  "properties": {},
      -  "type": "object"
      -}
    • removedOutput schema / properties / site_evaluation_handoff
      Removed value: -{
      -  "anyOf": [
      -    {
      -      "items": {
      -        "additionalProperties": {},
      -        "properties": {},
      -        "type": "object"
      -      },
      -      "type": "array"
      -    },
      -    {
      -      "additionalProperties": {},
      -      "properties": {},
      -      "type": "object"
      -    }
      -  ],
      -  "description": "Follow-up calls [{tool, parameters, why}] when the payload carries coordinates."
      -}
    • removedOutput schema / properties / success / anyOf
      Removed value: -[
      -  {
      -    "type": "boolean"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • removedOutput schema / properties / success / description
      Removed value: -"true when the search executed"
    • removedOutput schema / properties / tier / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • removedOutput schema / properties / tier / description
      Removed value: -"Tier the response was served at"
    • removedOutput schema / properties / total_matching / anyOf
      Removed value: -[
      -  {
      -    "anyOf": [
      -      {
      -        "type": "number"
      -      },
      -      {
      -        "type": "string"
      -      }
      -    ]
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • removedOutput schema / properties / total_matching / description
      Removed value: -"Total rows matching the filter across the dataset (null when withheld by tier)"
  2. Changed7 schema fields changedv2.12.43
    • changedOutput schema / properties / _entity / description
      Previous value: -"Payload class discriminator (e.g. facility|market|iso_grid|queue_results|deal|report|response) — branch on this before parsing the rest."New value: +"Payload class (facility|market|iso_grid|queue_results|deal|report|response); branch on it."
    • changedOutput schema / properties / _front_door / description
      Previous value: -"In-band front-door hint (first workflow-entry tool of a session): call plan_query(intent) first for the ordered multi-step plan."New value: +"First-tool hint: plan_query(intent) returns the ordered plan."
    • changedOutput schema / properties / _return_loop / description
      Previous value: -"Suggested next-session delta call (get_changes since=24h) so you pull only what changed."New value: +"Next-session delta call (get_changes)."
    • changedOutput schema / properties / citation / description
      Previous value: -"Machine-readable citation: how to attribute DC Hub (dchub.cloud) for this payload. Normally an OBJECT {source, url, license, cite_as, retrieved_at}; a bare string is accepted and carries the attribution line itself."New value: +"How to attribute DC Hub: {source, url, license, cite_as, retrieved_at}, or the attribution line as a string."
    • changedOutput schema / properties / provenance / description
      Previous value: -"Collection-level provenance block: {source, method, as_of, verification_counts, cite_url_template, license, cite_as}. Quote the verification level when citing."New value: +"Source, method, as_of, verification_counts, license, cite_as; quote it when citing."
    • changedOutput schema / properties / quota / description
      Previous value: -"Caller quota state (remaining calls, tier) when available."New value: +"Caller quota state (remaining calls, tier)."
    • changedOutput schema / properties / site_evaluation_handoff / description
      Previous value: -"Pre-built follow-up calls (analyze_site / get_water_risk args) when the payload carries coordinates — an array of {tool, parameters, why} entries."New value: +"Follow-up calls [{tool, parameters, why}] when the payload carries coordinates."
  3. Changed2 schema fields changed
    • removedInput schema / $schema
      Removed value: -"http://json-schema.org/draft-07/schema#"
    • removedOutput schema / $schema
      Removed value: -"http://json-schema.org/draft-07/schema#"
  4. Changed5 schema fields changedv2.3.20
    • removedOutput schema / properties / citation / additionalProperties
      Removed value: -{}
    • addedOutput schema / properties / citation / anyOf
      Added value: +[
      +  {
      +    "additionalProperties": {},
      +    "properties": {},
      +    "type": "object"
      +  },
      +  {
      +    "type": "string"
      +  }
      +]
    • changedOutput schema / properties / citation / description
      Previous value: -"Machine-readable citation: how to attribute DC Hub (dchub.cloud) for this payload."New value: +"Machine-readable citation: how to attribute DC Hub (dchub.cloud) for this payload. Normally an OBJECT {source, url, license, cite_as, retrieved_at}; a bare string is accepted and carries the attribution line itself."
    • removedOutput schema / properties / citation / properties
      Removed value: -{}
    • removedOutput schema / properties / citation / type
      Removed value: -"object"
  5. Changed1 schema field changedv2.3.12
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
      +  "$schema": "http://json-schema.org/draft-07/schema#",
      +  "additionalProperties": {},
      +  "description": "Facility search results: `data` rows (name, provider, location, capacity on fuller tiers) alongside the DC Hub envelope keys.",
      +  "properties": {
      +    "_entity": {
      +      "description": "Payload class discriminator (e.g. facility|market|iso_grid|queue_results|deal|report|response) — branch on this before parsing the rest.",
      +      "type": "string"
      +    },
      +    "_front_door": {
      +      "additionalProperties": {},
      +      "description": "In-band front-door hint (first workflow-entry tool of a session): call plan_query(intent) first for the ordered multi-step plan.",
      +      "properties": {},
      +      "type": "object"
      +    },
      +    "_return_loop": {
      +      "additionalProperties": {},
      +      "description": "Suggested next-session delta call (get_changes since=24h) so you pull only what changed.",
      +      "properties": {},
      +      "type": "object"
      +    },
      +    "citation": {
      +      "additionalProperties": {},
      +      "description": "Machine-readable citation: how to attribute DC Hub (dchub.cloud) for this payload.",
      +      "properties": {},
      +      "type": "object"
      +    },
      +    "count": {
      +      "anyOf": [
      +        {
      +          "anyOf": [
      +            {
      +              "type": "number"
      +            },
      +            {
      +              "type": "string"
      +            }
      +          ]
      +        },
      +        {
      +          "type": "null"
      +        }
      +      ],
      +      "description": "Rows returned in THIS response (null on some gated tiers)"
      +    },
      +    "data": {
      +      "anyOf": [
      +        {
      +          "items": {
      +            "additionalProperties": {},
      +            "properties": {
      +              "city": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "City"
      +              },
      +              "country": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "ISO-2 country code"
      +              },
      +              "country_name": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "Country full name"
      +              },
      +              "id": {
      +                "anyOf": [
      +                  {
      +                    "anyOf": [
      +                      {
      +                        "type": "number"
      +                      },
      +                      {
      +                        "type": "string"
      +                      }
      +                    ]
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "Facility id"
      +              },
      +              "lat": {
      +                "anyOf": [
      +                  {
      +                    "anyOf": [
      +                      {
      +                        "type": "number"
      +                      },
      +                      {
      +                        "type": "string"
      +                      }
      +                    ]
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "Latitude (fuller tiers)"
      +              },
      +              "location_display": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "Pre-formatted \"City, State, Country\" line"
      +              },
      +              "lon": {
      +                "anyOf": [
      +                  {
      +                    "anyOf": [
      +                      {
      +                        "type": "number"
      +                      },
      +                      {
      +                        "type": "string"
      +                      }
      +                    ]
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "Longitude (fuller tiers)"
      +              },
      +              "market_slug": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "Market slug — feed to get_market_intel / get_market_dcpi_rank (fuller tiers)"
      +              },
      +              "name": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "Facility name"
      +              },
      +              "power_mw": {
      +                "anyOf": [
      +                  {
      +                    "anyOf": [
      +                      {
      +                        "type": "number"
      +                      },
      +                      {
      +                        "type": "string"
      +                      }
      +                    ]
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "Power capacity in MW (fuller tiers)"
      +              },
      +              "profile_url": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "dchub.cloud facility page"
      +              },
      +              "provider": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "Operator / provider company"
      +              },
      +              "slug": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "URL slug — feed to get_facility for the full profile"
      +              },
      +              "state": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "State/region code"
      +              },
      +              "state_name": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "State/region full name"
      +              },
      +              "status": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "operational | under-construction | planned (fuller tiers)"
      +              },
      +              "v": {
      +                "anyOf": [
      +                  {
      +                    "type": "string"
      +                  },
      +                  {
      +                    "type": "null"
      +                  }
      +                ],
      +                "description": "Per-record verification flag: verified | tracked | published | inferred"
      +              }
      +            },
      +            "type": "object"
      +          },
      +          "type": "array"
      +        },
      +        {
      +          "type": "null"
      +        }
      +      ],
      +      "description": "Facility rows matching the filters"
      +    },
      +    "full_results_available": {
      +      "anyOf": [
      +        {
      +          "type": "boolean"
      +        },
      +        {
      +          "type": "null"
      +        }
      +      ],
      +      "description": "false when the row set was trimmed for your tier"
      +    },
      +    "note": {
      +      "anyOf": [
      +        {
      +          "type": "string"
      +        },
      +        {
      +          "type": "null"
      +        }
      +      ],
      +      "description": "Serving note (e.g. how many rows the full tier returns)"
      +    },
      +    "provenance": {
      +      "additionalProperties": {},
      +      "description": "Collection-level provenance block: {source, method, as_of, verification_counts, cite_url_template, license, cite_as}. Quote the verification level when citing.",
      +      "properties": {},
      +      "type": "object"
      +    },
      +    "quota": {
      +      "additionalProperties": {},
      +      "description": "Caller quota state (remaining calls, tier) when available.",
      +      "properties": {},
      +      "type": "object"
      +    },
      +    "site_evaluation_handoff": {
      +      "anyOf": [
      +        {
      +          "items": {
      +            "additionalProperties": {},
      +            "properties": {},
      +            "type": "object"
      +          },
      +          "type": "array"
      +        },
      +        {
      +          "additionalProperties": {},
      +          "properties": {},
      +          "type": "object"
      +        }
      +      ],
      +      "description": "Pre-built follow-up calls (analyze_site / get_water_risk args) when the payload carries coordinates — an array of {tool, parameters, why} entries."
      +    },
      +    "success": {
      +      "anyOf": [
      +        {
      +          "type": "boolean"
      +        },
      +        {
      +          "type": "null"
      +        }
      +      ],
      +      "description": "true when the search executed"
      +    },
      +    "tier": {
      +      "anyOf": [
      +        {
      +          "type": "string"
      +        },
      +        {
      +          "type": "null"
      +        }
      +      ],
      +      "description": "Tier the response was served at"
      +    },
      +    "total_matching": {
      +      "anyOf": [
      +        {
      +          "anyOf": [
      +            {
      +              "type": "number"
      +            },
      +            {
      +              "type": "string"
      +            }
      +          ]
      +        },
      +        {
      +          "type": "null"
      +        }
      +      ],
      +      "description": "Total rows matching the filter across the dataset (null when withheld by tier)"
      +    }
      +  },
      +  "type": "object"
      +}
  6. Changed16 schema fields changedv2.3.6
    • addedInput schema / properties / city / description
      Added value: +"City name to filter facilities, e.g. Ashburn, Dallas"
    • addedInput schema / properties / country / description
      Added value: +"ISO 3166-1 alpha-2 country code, e.g. US, GB, SG"
    • addedInput schema / properties / limit / description
      Added value: +"Max results to return (1-500; default varies by tool)"
    • changedInput schema / properties / limit / maximum
      Previous value: -9007199254740991New value: +500
    • changedInput schema / properties / limit / minimum
      Previous value: --9007199254740991New value: +1
    • addedInput schema / properties / max_capacity_mw / description
      Added value: +"Maximum power capacity filter in megawatts (MW)"
    • addedInput schema / properties / min_capacity_mw / description
      Added value: +"Minimum power capacity filter in megawatts (MW)"
    • addedInput schema / properties / offset / description
      Added value: +"Pagination offset, 0-based (skip this many results)"
    • changedInput schema / properties / offset / maximum
      Previous value: -9007199254740991New value: +100000
    • changedInput schema / properties / offset / minimum
      Previous value: --9007199254740991New value: +0
    • addedInput schema / properties / operator / description
      Added value: +"Operator/provider company name, e.g. Equinix, Digital Realty"
    • addedInput schema / properties / query / description
      Added value: +"Free-text search over facility name/operator/location (mapped to the backend `q` param), e.g. \"hyperscale Ashburn\""
    • addedInput schema / properties / state / description
      Added value: +"US state abbreviation or region, e.g. VA, TX"
    • addedInput schema / properties / tier / description
      Added value: +"Uptime Institute tier filter (1-4)"
    • changedInput schema / properties / tier / maximum
      Previous value: -9007199254740991New value: +4
    • changedInput schema / properties / tier / minimum
      Previous value: --9007199254740991New value: +1
  7. First observedv2.1.19

TDQS

A4.9/5.0
Behavior5/5

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

Annotations already cover the read-only/idempotent/non-destructive profile, and the description adds substantial context beyond them: free tier returns names and locations only, MW and specs require a paid key, rows carry a verified vs unverified_directory_listing flag, and empty results are normal. The free-tier limit of 25 vs 500 is also disclosed.

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?

Front-loaded with the usage trigger, then filters, then return shape, then access constraints and pagination — a logical order for an agent deciding whether to call. Sentences are semicolon-dense but each carries distinct, actionable information with no filler.

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, yet the description still usefully previews the key fields and the verification flag, and it covers the access-tier caveat and pagination behavior that the schema cannot express. For a 10-parameter, zero-required search tool, nothing an agent needs before calling is missing.

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

Parameters4/5

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

Schema coverage is 100%, so all ten parameters are already documented, which sets the baseline at 3. The description adds meaning the schema does not: MW range filters are gated behind a paid key, and the limit parameter is capped at 25 on the free tier. It doesn't explain offset/limit interaction beyond 'page with offset,' hence 4 rather than 5.

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?

States a specific verb and resource (search facilities / data centers) plus the exact scope: country, state, city, operator, MW range, tier, text. It also distinguishes itself from slug-level lookups with 'Start here for a facility slug,' which routes agents to get_facility rather than a sibling search.

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

Usage Guidelines5/5

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

Opens with an explicit trigger ('Use this when the user asks which data centers exist, or who operates in...') and names the downstream alternative ('Start here for a facility slug'). It also gives a concrete example query and tells the agent what to do when nothing matches — broaden filters rather than treat it as an error.

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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