@proof-holdings/mcp-server

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start_domain_email_verification

Starts domain verification by sending a verification code to a standard admin email address at the domain, enabling ownership confirmation.

Instructions

Start domain verification via corporate email. Sends a verification code to a standard admin email address at the domain.

ACCESS: needs a Proof account. Set PROOF_API_KEY and restart this server, or sign in with start_login — a session opens this tool — then call this tool again.

Input Schema

Name	Required	Description	Default
`id`	Yes	Domain ID
`email_prefix`	No	Email prefix to send verification to (default: admin)

Output Schema

Name	Required	Description
`data`	Yes	Domain record
`message`	Yes
`email_sent_to`	No	Sent when a code was sent; absent when the domain was already verified.
`expires_in_minutes`	No	Sent with `email_sent_to`.

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedv1.7.2Nov 6, 2026

removedInput schema / additionalProperties
```
Removed value: -false
```

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "description": "A verification code emailed to an address on the domain",
+  "properties": {
+    "data": {
+      "additionalProperties": {},
+      "description": "Domain record",
+      "properties": {
+        "actual_dns_host": {
+          "type": "string"
+        },
+        "actual_dns_host_name": {
+          "type": "string"
+        },
+        "check_count": {
+          "maximum": 9007199254740991,
+          "minimum": -9007199254740991,
+          "type": "integer"
+        },
+        "created_at": {
+          "type": "string"
+        },
+        "detected_provider": {
+          "type": "string"
+        },
+        "dns_mismatch_warning": {
+          "type": "string"
+        },
+        "dns_records": {
+          "items": {
+            "additionalProperties": {},
+            "properties": {
+              "name": {
+                "type": "string"
+              },
+              "priority": {
+                "maximum": 9007199254740991,
+                "minimum": -9007199254740991,
+                "type": "integer"
+              },
+              "purpose": {
+                "type": "string"
+              },
+              "type": {
+                "type": "string"
+              },
+              "value": {
+                "type": "string"
+              },
+              "verified": {
+                "type": "boolean"
+              },
+              "verified_at": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "type",
+              "name",
+              "value",
+              "purpose",
+              "verified"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "domain": {
+          "type": "string"
+        },
+        "email_sending_enabled": {
+          "type": "boolean"
+        },
+        "email_verification": {
+          "additionalProperties": {},
+          "properties": {
+            "attempts": {
+              "maximum": 9007199254740991,
+              "minimum": -9007199254740991,
+              "type": "integer"
+            },
+            "email_address": {
+              "type": "string"
+            },
+            "email_prefix": {
+              "type": "string"
+            },
+            "expires_at": {
+              "type": "string"
+            },
+            "last_sent_at": {
+              "type": "string"
+            },
+            "verified_at": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "email_prefix",
+            "email_address",
+            "expires_at",
+            "attempts"
+          ],
+          "type": "object"
+        },
+        "error_message": {
+          "type": "string"
+        },
+        "for_email_sending": {
+          "type": "boolean"
+        },
+        "for_verification": {
+          "type": "boolean"
+        },
+        "from_email": {
+          "type": "string"
+        },
+        "godaddy_connected": {
+          "type": "boolean"
+        },
+        "has_dns_mismatch": {
+          "type": "boolean"
+        },
+        "has_provider_credentials": {
+          "type": "boolean"
+        },
+        "http_file_content": {
+          "type": "string"
+        },
+        "http_file_path": {
+          "type": "string"
+        },
+        "id": {
+          "type": "string"
+        },
+        "last_checked_at": {
+          "type": "string"
+        },
+        "oauth_connected": {
+          "type": "boolean"
+        },
+        "oauth_url": {
+          "type": "string"
+        },
+        "profile_id": {
+          "type": "string"
+        },
+        "proof_expires_at": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "proof_id": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "proof_revoked_reason": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "proof_status": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "provider": {
+          "type": "string"
+        },
+        "provider_credential_name": {
+          "type": "string"
+        },
+        "provider_name": {
+          "type": "string"
+        },
+        "resend": {
+          "additionalProperties": {},
+          "properties": {
+            "dkim_records": {
+              "items": {
+                "additionalProperties": {},
+                "properties": {
+                  "name": {
+                    "type": "string"
+                  },
+                  "priority": {
+                    "maximum": 9007199254740991,
+                    "minimum": -9007199254740991,
+                    "type": "integer"
+                  },
+                  "purpose": {
+                    "type": "string"
+                  },
+                  "type": {
+                    "type": "string"
+                  },
+                  "value": {
+                    "type": "string"
+                  },
+                  "verified": {
+                    "type": "boolean"
+                  },
+                  "verified_at": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "type",
+                  "name",
+                  "value",
+                  "purpose",
+                  "verified"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "domain_id": {
+              "type": "string"
+            },
+            "last_checked_at": {
+              "type": "string"
+            },
+            "registered_at": {
+              "type": "string"
+            },
+            "status": {
+              "type": "string"
+            },
+            "verified_at": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "status",
+            "dkim_records"
+          ],
+          "type": "object"
+        },
+        "status": {
+          "type": "string"
+        },
+        "supports_api_key": {
+          "type": "boolean"
+        },
+        "supports_api_token": {
+          "type": "boolean"
+        },
+        "supports_auto_dns": {
+          "type": "boolean"
+        },
+        "txt_record_name": {
+          "type": "string"
+        },
+        "txt_record_value": {
+          "type": "string"
+        },
+        "updated_at": {
+          "type": "string"
+        },
+        "verification_method": {
+          "type": "string"
+        },
+        "verification_subtype": {
+          "type": "string"
+        },
+        "verified_at": {
+          "type": "string"
+        },
+        "verified_providers": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        }
+      },
+      "required": [
+        "id",
+        "domain",
+        "status",
+        "detected_provider",
+        "provider_name",
+        "supports_auto_dns",
+        "verification_method",
+        "for_email_sending",
+        "for_verification",
+        "dns_records",
+        "has_dns_mismatch",
+        "txt_record_name",
+        "txt_record_value",
+        "http_file_path",
+        "http_file_content",
+        "oauth_connected",
+        "godaddy_connected",
+        "supports_api_token",
+        "supports_api_key",
+        "verified_providers",
+        "check_count",
+        "created_at",
+        "updated_at"
+      ],
+      "type": "object"
+    },
+    "email_sent_to": {
+      "description": "Sent when a code was sent; absent when the domain was already verified.",
+      "type": "string"
+    },
+    "expires_in_minutes": {
+      "description": "Sent with `email_sent_to`.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "message": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "data",
+    "message"
+  ],
+  "type": "object"
+}

First observedv1.1.0Sep 9, 2026

TDQS

B3.4/5.0

Behavior3/5

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

Annotations only mark this as a non-readonly, non-destructive mutation, so the description carries the burden and does add value by disclosing the outbound side effect (an email is dispatched to an admin address) and the auth/session requirement. It stops short of stating whether repeat calls invalidate a prior code, whether rate limits apply, or what the caller should do after the email is sent.

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?

The purpose is front-loaded in two tight sentences, and the ACCESS block is clearly separated from the functional description. The access text reads as boilerplate and partly repeats itself ('Set PROOF_API_KEY and restart ... or sign in with start_login'), which keeps it just below top marks.

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?

A return-shape explanation is not needed because an output schema exists, and the inputs are fully documented. The missing piece is workflow context: this is a step in an email-verification sequence, and with dozens of adjacent verification tools the description should say what happens next and which sibling confirms the code.

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%, including the enum of allowed prefixes and the 'admin' default, so the schema already does the heavy lifting. The description only reinforces that the recipient is a standard admin address at the domain and adds nothing about how the domain 'id' is obtained, so baseline 3 applies.

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?

It states a specific verb and resource (start domain verification) plus the mechanism (a verification code mailed to an admin-address at the domain), so the action is unambiguous. However, it does not distinguish itself from closely named siblings such as start_domain_verification, start_user_domain_verification, or verify_domain, which an agent cannot disambiguate from this text alone.

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?

The ACCESS block gives real prerequisites (Proof account, PROOF_API_KEY, or obtaining a session via start_login), which is useful. But it offers no explicit when-to-use/when-not guidance against the many alternative verification entry points listed as siblings, and does not point to the natural follow-up (check_domain_email_status / confirm_domain_email_code).

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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