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Cheapest Domains

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Check domain availability

check_availability

Check one exact domain. Cloudflare answers first; configured fallbacks, then an optional selected registrar, run only for missing facts; a taken name ends the chain. Returns separate availability and nullable premium facts, provider attempts and check times; null premium is unconfirmed, not standard tier. Recheck after expiresAt (5 min; up to 30 days if taken). No prices, purchase or reservation.

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": {
      "name": "<name>",
      "tld": "<tld>"
    },
    "name": "check_availability"
  }
}

Input Schema

NameRequiredDescriptionDefault
tldYesOne covered ASCII top-level extension, such as com or .com. Multi-part suffixes and IDNs are not covered.
nameYesOne ASCII domain label without the extension, such as myproject. Price and link tools only build links from it; availability and popularity tools send the exact domain to their providers.
freshNoExplicitly request a fresh single-name recheck only when the user asks. Normal checks reuse saved evidence: five minutes, or up to 30 days for a name found taken. Fresh checks still obey provider gates, pending claims, caller limits and cooldowns; never use in a loop.
registrarNoConnected registrar ID from the registrars endpoint. Omit to compare all.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "$defs": {
+    "Availability": {
+      "properties": {
+        "apiVersion": {
+          "type": "string"
+        },
+        "attempts": {
+          "items": {
+            "$ref": "#/$defs/AvailabilityAttempt"
+          },
+          "maxItems": 5,
+          "type": "array"
+        },
+        "availability": {
+          "description": "Registration status; independent of premium classification.",
+          "enum": [
+            "available",
+            "unavailable",
+            "unknown"
+          ]
+        },
+        "checkedAt": {
+          "description": "Successful provider response time; null when no reliable result was obtained.",
+          "format": "date-time",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "domain": {
+          "type": "string"
+        },
+        "expiresAt": {
+          "description": "Recheck after this time; never a reservation or guarantee until expiry.",
+          "format": "date-time",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "fallback": {
+          "properties": {
+            "reason": {
+              "type": "string"
+            },
+            "registrar": {
+              "type": "string"
+            },
+            "state": {
+              "enum": [
+                "used",
+                "unavailable"
+              ]
+            }
+          },
+          "required": [
+            "registrar",
+            "state",
+            "reason"
+          ],
+          "type": "object"
+        },
+        "listEnrichmentComplete": {
+          "description": "Batch results: true when availability is known or every configured fallback stage has answered for this name. False means a later explicit request may add facts; it never means taken.",
+          "type": "boolean"
+        },
+        "message": {
+          "type": "string"
+        },
+        "premium": {
+          "description": "Null means not confirmed, never standard tier.",
+          "type": [
+            "boolean",
+            "null"
+          ]
+        },
+        "provider": {
+          "properties": {
+            "documentation": {
+              "format": "uri",
+              "type": "string"
+            },
+            "id": {
+              "type": "string"
+            },
+            "name": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "id",
+            "name",
+            "documentation"
+          ],
+          "type": "object"
+        },
+        "reason": {
+          "type": "string"
+        },
+        "registrar": {
+          "type": "string"
+        },
+        "service": {
+          "$ref": "#/$defs/ServiceInformation"
+        },
+        "status": {
+          "enum": [
+            "available",
+            "unavailable",
+            "premium",
+            "unsupported",
+            "unknown"
+          ],
+          "type": "string"
+        }
+      },
+      "required": [
+        "domain",
+        "status",
+        "reason",
+        "message",
+        "provider",
+        "checkedAt",
+        "expiresAt",
+        "service",
+        "apiVersion"
+      ],
+      "type": "object"
+    },
+    "AvailabilityAttempt": {
+      "properties": {
+        "availability": {
+          "enum": [
+            "available",
+            "unavailable",
+            "unknown"
+          ]
+        },
+        "checkedAt": {
+          "format": "date-time",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "expiresAt": {
+          "format": "date-time",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "outcome": {
+          "description": "Whether this stage returned an answer, failed before confirming evidence, or is still in progress. Optional for older responses.",
+          "enum": [
+            "answered",
+            "failed",
+            "pending"
+          ]
+        },
+        "premium": {
+          "type": [
+            "boolean",
+            "null"
+          ]
+        },
+        "provider": {
+          "properties": {
+            "documentation": {
+              "format": "uri",
+              "type": "string"
+            },
+            "id": {
+              "type": "string"
+            },
+            "name": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "id",
+            "name",
+            "documentation"
+          ],
+          "type": "object"
+        },
+        "reason": {
+          "type": "string"
+        },
+        "retryAfterSeconds": {
+          "description": "Suggested wait after a failed stage; never an evidence lifetime.",
+          "minimum": 0,
+          "type": "number"
+        }
+      },
+      "required": [
+        "provider",
+        "availability",
+        "premium",
+        "reason",
+        "checkedAt",
+        "expiresAt"
+      ],
+      "type": "object"
+    },
+    "Error": {
+      "properties": {
+        "apiVersion": {
+          "type": "string"
+        },
+        "error": {
+          "properties": {
+            "code": {
+              "type": "string"
+            },
+            "message": {
+              "type": "string"
+            },
+            "retryAfterSeconds": {
+              "minimum": 0,
+              "type": "number"
+            }
+          },
+          "required": [
+            "code",
+            "message"
+          ],
+          "type": "object"
+        }
+      },
+      "required": [
+        "apiVersion",
+        "error"
+      ],
+      "type": "object"
+    },
+    "ServiceInformation": {
+      "description": "Cheapest Domains identity and optional setup links, separate from upstream evidence. Does not establish client installation or provider health.",
+      "properties": {
+        "name": {
+          "const": "Cheapest Domains"
+        },
+        "pluginUrl": {
+          "format": "uri",
+          "type": "string"
+        },
+        "setupUrl": {
+          "format": "uri",
+          "type": "string"
+        },
+        "url": {
+          "format": "uri",
+          "type": "string"
+        }
+      },
+      "required": [
+        "name",
+        "url",
+        "setupUrl",
+        "pluginUrl"
+      ],
+      "type": "object"
+    }
+  },
+  "anyOf": [
+    {
+      "$ref": "#/$defs/Availability"
+    },
+    {
+      "$ref": "#/$defs/Error"
+    }
+  ],
+  "description": "Successful results are Availability, the REST 200 response; results with isError: true are Error.",
+  "type": "object"
+}
  2. Changed1 schema field changed
    • changedInput schema / properties / fresh / description
      Previous value: -"Explicitly request a fresh single-name recheck only when the user asks. Normal checks reuse five-minute evidence. Fresh checks still obey provider gates, pending claims, caller limits and cooldowns; never use in a loop."New value: +"Explicitly request a fresh single-name recheck only when the user asks. Normal checks reuse saved evidence: five minutes, or up to 30 days for a name found taken. Fresh checks still obey provider gates, pending claims, caller limits and cooldowns; never use in a loop."
  3. First observed

TDQS

A4.1/5.0
Behavior4/5

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

Adds substantial behavior beyond the annotations: the provider chain order (Cloudflare first, fallbacks and registrar only for missing facts, taken name ends the chain), the caching windows with expiresAt, and the warning not to loop fresh checks. Also clarifies null premium means unconfirmed rather than standard tier. It stops short of describing rate-limit or auth failure modes, but the annotation profile (openWorld, non-idempotent) is well complemented.

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

Conciseness4/5

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

Dense but front-loaded: the core scope leads, then chain behavior, then return semantics and caching. It reads telegraphically (semicolon-joined clauses) and could be split for parseability, but no sentence is filler.

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?

For a read-check tool with an output schema and full parameter coverage, this covers the essentials: provider ordering, null-premium interpretation, cache lifetime and the explicit non-scope (no prices, purchase or reservation). Minor gaps remain around failure reporting and limits, but nothing needed to call it correctly is missing.

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 description coverage is 100%, so all four parameters are already documented in detail. The description adds only the registrar's role in the fallback chain and the caching window for fresh, so it modestly extends rather than duplicates the schema — baseline 3 is appropriate.

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?

"Check one exact domain" states a specific verb and resource, and the word "one" implicitly draws the line against the batch sibling. An agent knows immediately whether this is a single-name lookup or a bulk operation.

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

Usage Guidelines4/5

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

Gives concrete when-to-use conditions: normal checks reuse saved evidence, a fresh recheck is "only when the user asks," and registrar should be omitted to compare all. It never names the batch or price siblings explicitly, so cross-tool routing is left slightly to inference.

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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