Nombrio Clearance Check

Clearance Check — one name (free)

check_name

Read-only

Run a free Clearance Check on ONE brand, business, product or app name. Live registry data, not guesses: US trademark verdict (USPTO — clear / caution / conflict with a count of live registrations), a count-only EU trademark screen (EUIPO), domain availability with prices (.com .io .co .app .dev), social handles (X/Twitter, TikTok, LinkedIn, Facebook; Instagram returns a confirm-link), developer namespaces (npm, PyPI, crates.io, GitHub, Docker Hub), the iOS App Store, and an overall viability band (strong / caution / blockers / high-risk) plus a link to the full interactive result. Use it when the user asks whether a SPECIFIC name is taken, trademarked, available or safe to use — and also at everyday developer naming moments: naming a new project, app, product, repo, package, CLI or domain while scaffolding, before publishing to npm/PyPI/crates.io, or whenever a name is being chosen in passing (the namespaces it checks are exactly those). For a shortlist or comparison use check_names instead — one call, all names in parallel, ranked. Free, no API key; shared fair-use pool with a per-caller daily allowance. Not legal advice. Data by nombrio.com.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`name`	Yes	The candidate name to check, e.g. 'Lumeo'. Plain name only — no URL, no TLD, no @handle. For several names use check_names.

Output Schema

TableJSON Schema

Name	Required	Description
`name`	Yes
`note`	No	Parse correction or why the check is partial.
`plan`	No
`links`	Yes
`quota`	No	Per-caller fair-use quota. Absent on cache hits and degraded paths.
`score`	No
`source`	No
`status`	Yes
`domains`	Yes
`verdict`	Yes
`appStore`	No
`conflicts`	No
`developer`	Yes
`disclaimer`	Yes
`registries`	No
`socialHandles`	Yes
`lockedInFullReport`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedAug 29, 2026

addedOutput schema / properties / conflicts / items / properties / classLabels

Added value: +{
+  "description": "Human-readable Nice Classification labels ('9 Electronics & Software'), aligned index-for-index with the numeric class array.",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

addedOutput schema / properties / verdict / properties / conflictClassLabels

Added value: +{
+  "description": "Human-readable Nice Classification labels ('9 Electronics & Software'), aligned index-for-index with the numeric class array.",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

addedOutput schema / properties / verdict / properties / euConflictClassLabels

Added value: +{
+  "description": "Human-readable Nice Classification labels ('9 Electronics & Software'), aligned index-for-index with the numeric class array.",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

Changed1 schema field changedAug 27, 2026

addedOutput schema / properties / links / properties / apiAccess

Added value: +{
+  "description": "Connect a plan (API key) — checks then run on the caller's own plan quota, independent of the free pools. Present when this check was capped.",
+  "type": "string"
+}

Changed11 schema fields changedAug 23, 2026

addedOutput schema / properties / conflicts

Added value: +{
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "classes": {
+        "items": {
+          "type": "integer"
+        },
+        "type": "array"
+      },
+      "name": {
+        "type": "string"
+      },
+      "owner": {
+        "type": "string"
+      },
+      "registries": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "similarity": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "name",
+      "registries",
+      "similarity"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

addedOutput schema / properties / links / properties / report

Added value: +{
+  "description": "Full interactive result on the caller's plan.",
+  "type": "string"
+}

addedOutput schema / properties / links / properties / upgrade

Added value: +{
+  "description": "Where to get a plan (pricing).",
+  "type": "string"
+}

addedOutput schema / properties / plan

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "checksLimit": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "checksRemaining": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "checksUsed": {
+      "type": "integer"
+    },
+    "resetsAt": {
+      "type": "string"
+    },
+    "tier": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "tier"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / registries

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "eu": {
+      "$ref": "#/properties/registries/properties/us"
+    },
+    "uk": {
+      "$ref": "#/properties/registries/properties/us"
+    },
+    "us": {
+      "additionalProperties": false,
+      "properties": {
+        "matches": {
+          "type": "integer"
+        },
+        "reason": {
+          "type": "string"
+        },
+        "status": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "status",
+        "matches"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+    "us",
+    "eu",
+    "uk"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / score

Added value: +{
+  "maximum": 100,
+  "minimum": 0,
+  "type": "integer"
+}

addedOutput schema / properties / source

Added value: +{
+  "enum": [
+    "free",
+    "plan"
+  ],
+  "type": "string"
+}

removedOutput schema / properties / verdict / properties / confidence / const
```
Removed value: -"low"
```
addedOutput schema / properties / verdict / properties / confidence / enum
```
Added value: +[
+  "low",
+  "high"
+]
```

changedOutput schema / properties / verdict / properties / coverage / enum

Previous value: -[
-  "US",
-  "US+EU"
-]New value: +[
+  "US",
+  "US+EU",
+  "US+EU+UK"
+]

changedOutput schema / properties / verdict / required

Previous value: -[
-  "coverage",
-  "confidence",
-  "capped"
-]New value: +[
+  "confidence",
+  "capped"
+]

Changed2 schema fields changedAug 23, 2026

changedInput schema / properties / name / description

Previous value: -"The candidate name to check, e.g. 'Lumeo'. Plain name only — no URL, no TLD, no @handle. One name per call."New value: +"The candidate name to check, e.g. 'Lumeo'. Plain name only — no URL, no TLD, no @handle. For several names use check_names."

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "appStore": {
+      "additionalProperties": false,
+      "properties": {
+        "matchCount": {
+          "type": "integer"
+        },
+        "verdict": {
+          "enum": [
+            "clear",
+            "similar",
+            "conflict",
+            "unknown"
+          ],
+          "type": "string"
+        }
+      },
+      "required": [
+        "verdict",
+        "matchCount"
+      ],
+      "type": "object"
+    },
+    "developer": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "available": {
+            "type": "boolean"
+          },
+          "namespace": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "namespace",
+          "available"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "disclaimer": {
+      "const": "Not legal advice.",
+      "type": "string"
+    },
+    "domains": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "available": {
+            "type": "boolean"
+          },
+          "priceUsd": {
+            "type": "number"
+          },
+          "tld": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "tld",
+          "available"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "links": {
+      "additionalProperties": false,
+      "properties": {
+        "fullResult": {
+          "description": "Full interactive result (free).",
+          "type": "string"
+        }
+      },
+      "required": [
+        "fullResult"
+      ],
+      "type": "object"
+    },
+    "lockedInFullReport": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "name": {
+      "type": "string"
+    },
+    "note": {
+      "description": "Parse correction or why the check is partial.",
+      "type": "string"
+    },
+    "quota": {
+      "additionalProperties": false,
+      "description": "Per-caller fair-use quota. Absent on cache hits and degraded paths.",
+      "properties": {
+        "limit": {
+          "description": "Free checks per caller per UTC day.",
+          "type": "integer"
+        },
+        "resetsAt": {
+          "description": "ISO timestamp of the next UTC midnight reset.",
+          "type": "string"
+        },
+        "used": {
+          "description": "Free checks this caller has used today (UTC).",
+          "type": "integer"
+        }
+      },
+      "required": [
+        "used",
+        "limit",
+        "resetsAt"
+      ],
+      "type": "object"
+    },
+    "socialHandles": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "available": {
+            "type": [
+              "boolean",
+              "null"
+            ]
+          },
+          "confirmUrl": {
+            "type": "string"
+          },
+          "platform": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "platform",
+          "available"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "status": {
+      "enum": [
+        "ok",
+        "capped",
+        "invalid",
+        "error"
+      ],
+      "type": "string"
+    },
+    "verdict": {
+      "additionalProperties": false,
+      "properties": {
+        "capped": {
+          "type": "boolean"
+        },
+        "confidence": {
+          "const": "low",
+          "type": "string"
+        },
+        "conflictClasses": {
+          "items": {
+            "type": "integer"
+          },
+          "type": "array"
+        },
+        "conflictCount": {
+          "type": "integer"
+        },
+        "coverage": {
+          "enum": [
+            "US",
+            "US+EU"
+          ],
+          "type": "string"
+        },
+        "euConflictClasses": {
+          "items": {
+            "type": "integer"
+          },
+          "type": "array"
+        },
+        "euConflictCount": {
+          "type": "integer"
+        },
+        "euTrademarkRisk": {
+          "enum": [
+            "clear",
+            "conflict"
+          ],
+          "type": "string"
+        },
+        "trademarkRisk": {
+          "enum": [
+            "clear",
+            "caution",
+            "conflict"
+          ],
+          "type": "string"
+        },
+        "viabilityBand": {
+          "enum": [
+            "strong",
+            "caution",
+            "blockers",
+            "high-risk"
+          ],
+          "type": "string"
+        }
+      },
+      "required": [
+        "coverage",
+        "confidence",
+        "capped"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+    "name",
+    "status",
+    "verdict",
+    "domains",
+    "socialHandles",
+    "developer",
+    "links",
+    "lockedInFullReport",
+    "disclaimer"
+  ],
+  "type": "object"
+}

First observedJul 9, 2026

TDQS

A4.7/5.0

Behavior5/5

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

Annotations already declare readOnlyHint=true and openWorldHint=true, and the description adds genuinely useful operational context: live registry data, free/no API key, shared fair-use pool with per-caller daily allowance, Instagram returning a confirm-link, and 'Not legal advice.' These are behavioral details beyond the annotations and schema.

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?

The description is long but every segment adds value — scope, result contents, usage triggers, alternative routing, cost/access caveats, and data source. It is front-loaded with the core action and the one-name limitation, and the later sentences deepen rather than repeat.

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?

With one required parameter and an output schema present, the description still covers the full decision context: what the check covers, what the output includes, when this tool is appropriate, when to use check_names, access constraints, and non-legal caveat. Nothing an agent needs to correctly select or invoke it 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%, and the schema already instructs 'Plain name only — no URL, no TLD, no @handle' and to use check_names for multiple names. The description reinforces that this checks a single name but does not add much parameter-level meaning beyond what the schema already provides.

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

Purpose5/5

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

The description opens with a specific verb and resource: 'Run a free Clearance Check on ONE brand, business, product or app name.' It enumerates the exact checks performed (USPTO, EUIPO, domains, social handles, developer namespaces, iOS App Store) and explicitly contrasts itself with check_names, so an agent can distinguish it without inspecting other tools.

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?

It gives explicit when-to-use guidance: 'Use it when the user asks whether a SPECIFIC name is taken...' and covers everyday naming moments. It also names the alternative for shortlists: 'For a shortlist or comparison use check_names instead' — clear routing to the sibling tool.

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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