Skip to main content
Glama
Sign In

TLD Bench

by com.tldbench
OverviewDiscussionsAdmin

Check availability

check_availability
Read-onlyIdempotent

Use this when the user asks whether specific domain names are free. Checks the registry (RDAP, WHOIS for some ccTLDs) after a DNS pre-check, with an honest unknown, and adds the cheapest registrar's price to own each free name. Up to 50 names in one call.

Input Schema

NameRequiredDescriptionDefault
modeNofast: a DNS delegation is accepted as proof of registration; precise: always ask the registry (status codes, expiry)fast
yearsNohorizon for totals, 1-10 years (default 3)
domainsYes1-50 full names (example.com, bücher.de)
currencyNoISO 4217 currency for prices (default USD); converted at the ECB's daily rate, disclosed in `fx`
with_pricesNoadd the cheapest registrar's price for names that are free
include_resellersNoinclude registrars whose prices are a reseller account's tier (pricing_tier reseller, e.g. eNom); default false
include_limited_promosNocount limited promotions (one per customer, first-time customers only) in totals and rankings; default false: they are listed and flagged promo_limited, but year 1 is priced at the regular price

Output Schema

NameRequiredDescriptionDefault
as_ofYeswhen this answer was put together
notesYes
yearsYes
resultsYesin the order asked
currencyYesISO 4217

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed3 schema fields changed
    • addedInput schema / properties / include_limited_promos
      Added value: +{
+  "default": false,
+  "description": "count limited promotions (one per customer, first-time customers only) in totals and rankings; default false: they are listed and flagged promo_limited, but year 1 is priced at the regular price",
+  "type": "boolean"
+}
    • addedInput schema / properties / include_resellers
      Added value: +{
+  "default": false,
+  "description": "include registrars whose prices are a reseller account's tier (pricing_tier reseller, e.g. eNom); default false",
+  "type": "boolean"
+}
    • changedOutput schema / properties / results / items / properties / cheapest / anyOf
      Previous value: -[
-  {
-    "description": "The cheapest registrar to own the name for `years` (standard price; a premium name costs more).",
-    "properties": {
-      "first_payment": {
-        "description": "An amount in major units (12.99), in `currency`.",
-        "properties": {
-          "amount": {
-            "type": "number"
-          },
-          "currency": {
-            "description": "ISO 4217",
-            "examples": [
-              "USD"
-            ],
-            "pattern": "^[A-Z]{3}$",
-            "type": "string"
-          }
-        },
-        "required": [
-          "amount",
-          "currency"
-        ],
-        "type": "object"
-      },
-      "min_years": {
-        "anyOf": [
-          {
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "observed_at": {
-        "examples": [
-          "2026-11-06T04:12:00.000Z"
-        ],
-        "format": "date-time",
-        "type": "string"
-      },
-      "promo_first_year": {
-        "type": "boolean"
-      },
-      "register": {
-        "anyOf": [
-          {
-            "description": "An amount in major units (12.99), in `currency`.",
-            "properties": {
-              "amount": {
-                "type": "number"
-              },
-              "currency": {
-                "description": "ISO 4217",
-                "examples": [
-                  "USD"
-                ],
-                "pattern": "^[A-Z]{3}$",
-                "type": "string"
-              }
-            },
-            "required": [
-              "amount",
-              "currency"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "year 1 now (a promotion when one runs)"
-      },
-      "registrar": {
-        "properties": {
-          "id": {
-            "examples": [
-              "porkbun"
-            ],
-            "type": "string"
-          },
-          "name": {
-            "examples": [
-              "Porkbun"
-            ],
-            "type": "string"
-          },
-          "url": {
-            "description": "the registrar's website (a plain link, no affiliate code)",
-            "type": [
-              "string",
-              "null"
-            ]
-          }
-        },
-        "required": [
-          "id",
-          "name",
-          "url"
-        ],
-        "type": "object"
-      },
-      "renew": {
-        "anyOf": [
-          {
-            "description": "An amount in major units (12.99), in `currency`.",
-            "properties": {
-              "amount": {
-                "type": "number"
-              },
-              "currency": {
-                "description": "ISO 4217",
-                "examples": [
-                  "USD"
-                ],
-                "pattern": "^[A-Z]{3}$",
-                "type": "string"
-              }
-            },
-            "required": [
-              "amount",
-              "currency"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "the regular renewal"
-      },
-      "source": {
-        "properties": {
-          "id": {
-            "examples": [
-              "porkbun"
-            ],
-            "type": "string"
-          },
-          "kind": {
-            "description": "api: the registrar's own price API; price_list: a file or JSON the registrar publishes; page: its price page; mirror: a third party's copy of the registrar's prices",
-            "enum": [
-              "api",
-              "price_list",
-              "page",
-              "mirror"
-            ],
-            "type": "string"
-          },
-          "url": {
-            "description": "where the price was read",
-            "type": "string"
-          }
-        },
-        "required": [
-          "id",
-          "kind",
-          "url"
-        ],
-        "type": "object"
-      },
-      "total": {
-        "description": "the cost to own it for `years` (computeTco), the same number as /v1/tlds/{tld}/prices",
-        "properties": {
-          "amount": {
-            "type": "number"
-          },
-          "currency": {
-            "description": "ISO 4217",
-            "examples": [
-              "USD"
-            ],
-            "pattern": "^[A-Z]{3}$",
-            "type": "string"
-          }
-        },
-        "required": [
-          "amount",
-          "currency"
-        ],
-        "type": "object"
-      },
-      "years": {
-        "type": "integer"
-      }
-    },
-    "required": [
-      "registrar",
-      "years",
-      "register",
-      "renew",
-      "first_payment",
-      "total",
-      "min_years",
-      "promo_first_year",
-      "observed_at",
-      "source"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "description": "The cheapest registrar to own the name for `years` (standard price; a premium name costs more).",
+    "properties": {
+      "estimated": {
+        "description": "the total prices a year at the regular renewal because its own regular price is unknown",
+        "type": "boolean"
+      },
+      "first_payment": {
+        "description": "An amount in major units (12.99), in `currency`.",
+        "properties": {
+          "amount": {
+            "type": "number"
+          },
+          "currency": {
+            "description": "ISO 4217",
+            "examples": [
+              "USD"
+            ],
+            "pattern": "^[A-Z]{3}$",
+            "type": "string"
+          }
+        },
+        "required": [
+          "amount",
+          "currency"
+        ],
+        "type": "object"
+      },
+      "min_years": {
+        "anyOf": [
+          {
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "observed_at": {
+        "examples": [
+          "2026-11-06T04:12:00.000Z"
+        ],
+        "format": "date-time",
+        "type": "string"
+      },
+      "promo_first_year": {
+        "type": "boolean"
+      },
+      "register": {
+        "anyOf": [
+          {
+            "description": "An amount in major units (12.99), in `currency`.",
+            "properties": {
+              "amount": {
+                "type": "number"
+              },
+              "currency": {
+                "description": "ISO 4217",
+                "examples": [
+                  "USD"
+                ],
+                "pattern": "^[A-Z]{3}$",
+                "type": "string"
+              }
+            },
+            "required": [
+              "amount",
+              "currency"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "year 1 now (a promotion when one runs)"
+      },
+      "registrar": {
+        "properties": {
+          "id": {
+            "examples": [
+              "porkbun"
+            ],
+            "type": "string"
+          },
+          "name": {
+            "examples": [
+              "Porkbun"
+            ],
+            "type": "string"
+          },
+          "note": {
+            "anyOf": [
+              {
+                "description": "A short, sourced note about the registrar's prices (not a price we rank by).",
+                "properties": {
+                  "checked_on": {
+                    "anyOf": [
+                      {
+                        "examples": [
+                          "2026-11-05"
+                        ],
+                        "format": "date",
+                        "type": "string"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ]
+                  },
+                  "text": {
+                    "examples": [
+                      "NameSilo's free discount program prices .com at $12.00 (retail $19.99)."
+                    ],
+                    "type": "string"
+                  },
+                  "url": {
+                    "description": "where the note's facts come from",
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  }
+                },
+                "required": [
+                  "text",
+                  "url",
+                  "checked_on"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "pricing_tier": {
+            "description": "retail: anyone can buy at these prices; reseller: the prices are a reseller account's tier (eNom's Silver), left out of consumer rankings unless include_resellers=true",
+            "enum": [
+              "retail",
+              "reseller"
+            ],
+            "type": "string"
+          },
+          "url": {
+            "description": "the registrar's website (a plain link, no affiliate code)",
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "id",
+          "name",
+          "url"
+        ],
+        "type": "object"
+      },
+      "renew": {
+        "anyOf": [
+          {
+            "description": "An amount in major units (12.99), in `currency`.",
+            "properties": {
+              "amount": {
+                "type": "number"
+              },
+              "currency": {
+                "description": "ISO 4217",
+                "examples": [
+                  "USD"
+                ],
+                "pattern": "^[A-Z]{3}$",
+                "type": "string"
+              }
+            },
+            "required": [
+              "amount",
+              "currency"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "the regular renewal"
+      },
+      "source": {
+        "properties": {
+          "id": {
+            "examples": [
+              "porkbun"
+            ],
+            "type": "string"
+          },
+          "kind": {
+            "description": "api: the registrar's own price API; price_list: a file or JSON the registrar publishes; page: its price page; mirror: a third party's copy of the registrar's prices",
+            "enum": [
+              "api",
+              "price_list",
+              "page",
+              "mirror"
+            ],
+            "type": "string"
+          },
+          "url": {
+            "description": "where the price was read",
+            "type": "string"
+          }
+        },
+        "required": [
+          "id",
+          "kind",
+          "url"
+        ],
+        "type": "object"
+      },
+      "total": {
+        "description": "the cost to own it for `years` (computeTco), the same number as /v1/tlds/{tld}/prices",
+        "properties": {
+          "amount": {
+            "type": "number"
+          },
+          "currency": {
+            "description": "ISO 4217",
+            "examples": [
+              "USD"
+            ],
+            "pattern": "^[A-Z]{3}$",
+            "type": "string"
+          }
+        },
+        "required": [
+          "amount",
+          "currency"
+        ],
+        "type": "object"
+      },
+      "years": {
+        "type": "integer"
+      }
+    },
+    "required": [
+      "registrar",
+      "years",
+      "register",
+      "renew",
+      "first_payment",
+      "total",
+      "min_years",
+      "promo_first_year",
+      "observed_at",
+      "source"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]
  2. First observed

TDQS

A4/5.0
Behavior4/5

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

Annotations already declare readOnly/idempotent/non-destructive, so the bar is lower, and the description adds real signal beyond them: a DNS pre-check precedes the registry lookup, failures surface as an 'honest unknown' rather than a false negative, and prices are attached to free names. It doesn't discuss rate limits or latency of the registry round-trip.

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?

Three short sentences, front-loaded with the trigger, then mechanism, then cost side effect. No filler and nothing restated from the schema.

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

Completeness4/5

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

With an output schema present, return values needn't be described, and annotations cover the safety profile; the description fills in the lookup pipeline and the unknown-result behavior. Minor gaps remain on what the DNS pre-check means for accuracy in fast mode.

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?

Schema coverage is 100%, so mode, years, currency, and the include_* flags are already documented; the description only reinforces the 50-name cap and the with_prices behavior. It adds little about the fast-vs-precise tradeoff beyond what the enum description already says.

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 description states a specific verb and resource ('checks the registry' for domain 'free' status) and adds implementation detail (RDAP, WHOIS for ccTLDs) plus a side effect (cheapest registrar's price on free names). It does not explicitly name a sibling to defer to (e.g., cheapest_registrar or total_cost_of_ownership), so the pricing overlap is left for the agent to infer.

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?

'Use this when the user asks whether specific domain names are free' gives a clear trigger condition, and the 50-name batch hint sets scope. No when-not guidance or explicit alternatives are offered, even though sibling tools cover pricing and suggestions.

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

All TLD Bench toolsInspect
Try in Browser
One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Glama MCP Gateway

Add one secure layer between your agents and this server.

Resources