ContrastAPI

Email Verify

email_verify

Read-onlyIdempotent

One-call email validation combining syntax + MX records + disposable check + role-address detection (admin@/info@/...) + free-provider classification (gmail/outlook/yahoo/...). Use BEFORE adding an email to a contact list, sending an outbound message, or auditing a lead-list dump — replaces 2-3 tool calls (email_mx + email_disposable + manual role parse) with one structured response. Deliberately does NOT do SMTP RCPT TO deliverability probing — Hunter.io / NeverBounce-style mailbox enumeration is an ethical grey area we declined; use those services if you need that specific signal. role_address=true on admin@, info@, noreply@, support@, etc. (Gmail-style +tag is stripped before classification). free_provider=true on consumer-mailbox domains (B2B detection signal — a 'work' email at @gmail.com likely isn't a corporate user). Free: 30/hr, Pro: 500/hr. Returns {email, domain, syntax_valid, mx_records, disposable, disposable_provider, role_address, role_type, free_provider, summary}.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`email`	Yes	Full email address to verify (e.g. 'admin@example.com', 'user@gmail.com'). Must contain '@'.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

Changed4 schema fields changedJun 2, 2026
- changedOutput schema / properties / result / properties / disposable_provider / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / next_calls / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / role_type / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / verdict / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
Changed3 schema fields changedMay 25, 2026
- changedOutput schema / properties / result / properties / disposable_provider / type
```
Previous value: -"object"New value: +"string"
```
- changedOutput schema / properties / result / properties / next_calls / type
```
Previous value: -"object"New value: +"array"
```
- changedOutput schema / properties / result / properties / role_type / type
```
Previous value: -"object"New value: +"string"
```

Changed1 schema field changedMay 22, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "result": {
+      "properties": {
+        "disposable": {
+          "type": "boolean"
+        },
+        "disposable_provider": {
+          "type": "object"
+        },
+        "domain": {
+          "type": "string"
+        },
+        "email": {
+          "type": "string"
+        },
+        "free_provider": {
+          "type": "boolean"
+        },
+        "mx_records": {
+          "type": "array"
+        },
+        "next_calls": {
+          "type": "object"
+        },
+        "role_address": {
+          "type": "boolean"
+        },
+        "role_type": {
+          "type": "object"
+        },
+        "summary": {
+          "type": "string"
+        },
+        "syntax_valid": {
+          "type": "boolean"
+        },
+        "verdict": {
+          "type": "object"
+        }
+      },
+      "required": [
+        "email",
+        "domain",
+        "syntax_valid"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+    "result"
+  ],
+  "type": "object"
+}

Changed1 schema field changedMay 22, 2026

changedOutput schema / (root)

Previous value: -{
-  "$defs": {
-    "EmailVerifyResponse": {
-      "properties": {
-        "disposable": {
-          "type": "boolean"
-        },
-        "disposable_provider": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "domain": {
-          "type": "string"
-        },
-        "email": {
-          "type": "string"
-        },
-        "free_provider": {
-          "type": "boolean"
-        },
-        "mx_records": {
-          "items": {
-            "$ref": "#/$defs/MxDnsRecord"
-          },
-          "type": "array"
-        },
-        "next_calls": {
-          "anyOf": [
-            {
-              "items": {
-                "$ref": "#/$defs/PivotHint"
-              },
-              "type": "array"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "role_address": {
-          "type": "boolean"
-        },
-        "role_type": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "summary": {
-          "type": "string"
-        },
-        "syntax_valid": {
-          "type": "boolean"
-        },
-        "verdict": {
-          "anyOf": [
-            {
-              "$ref": "#/$defs/Verdict"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        }
-      },
-      "required": [
-        "email",
-        "domain",
-        "syntax_valid"
-      ],
-      "type": "object"
-    },
-    "ErrorDetail": {
-      "properties": {
-        "code": {
-          "enum": [
-            "invalid_argument",
-            "not_found",
-            "rate_limit_exceeded",
-            "auth_required",
-            "tier_limit",
-            "upstream_timeout",
-            "upstream_error",
-            "internal_error"
-          ],
-          "type": "string"
-        },
-        "docs_url": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "message": {
-          "maxLength": 500,
-          "type": "string"
-        },
-        "retry_after_seconds": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "upgrade_url": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        }
-      },
-      "required": [
-        "code",
-        "message"
-      ],
-      "type": "object"
-    },
-    "ErrorResponse": {
-      "properties": {
-        "error": {
-          "$ref": "#/$defs/ErrorDetail"
-        }
-      },
-      "required": [
-        "error"
-      ],
-      "type": "object"
-    },
-    "MxDnsRecord": {
-      "properties": {
-        "host": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "priority": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        }
-      },
-      "type": "object"
-    },
-    "PivotHint": {
-      "additionalProperties": true,
-      "properties": {
-        "input": {
-          "type": "string"
-        },
-        "params": {
-          "anyOf": [
-            {
-              "additionalProperties": {
-                "type": "string"
-              },
-              "type": "object"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "reason": {
-          "type": "string"
-        },
-        "tool": {
-          "enum": [
-            "cve_lookup",
-            "cve_search",
-            "cve_leading",
-            "bulk_cve_lookup",
-            "calculate_risk_score",
-            "get_cvss_details",
-            "exploit_lookup",
-            "kev_detail",
-            "cwe_lookup",
-            "subdomain_enum",
-            "ssl_check",
-            "tech_fingerprint",
-            "asn_lookup",
-            "ip_lookup",
-            "ioc_lookup",
-            "bulk_ioc_lookup",
-            "hash_lookup",
-            "threat_intel",
-            "threat_report",
-            "audit_domain",
-            "domain_report",
-            "dns_lookup",
-            "whois_lookup",
-            "wayback_lookup",
-            "scan_headers",
-            "check_headers",
-            "check_secrets",
-            "check_injection",
-            "check_dependencies",
-            "email_mx",
-            "email_security_posture",
-            "email_disposable",
-            "email_verify",
-            "robots_txt",
-            "redirect_chain",
-            "brand_assets",
-            "seo_audit",
-            "phone_lookup",
-            "username_lookup",
-            "password_check",
-            "phishing_check",
-            "atlas_technique_lookup",
-            "atlas_technique_search",
-            "bulk_atlas_technique_lookup",
-            "atlas_case_study_lookup",
-            "atlas_case_study_search",
-            "d3fend_defense_lookup",
-            "d3fend_defense_search",
-            "d3fend_defense_for_attack",
-            "d3fend_attack_coverage",
-            "sigma_rule_lookup",
-            "bulk_sigma_rule_lookup",
-            "tech_stack_cve_audit"
-          ],
-          "type": "string"
-        }
-      },
-      "required": [
-        "tool",
-        "input",
-        "reason"
-      ],
-      "type": "object"
-    },
-    "Verdict": {
-      "properties": {
-        "completeness": {
-          "enum": [
-            "complete",
-            "partial",
-            "minimal"
-          ],
-          "type": "string"
-        },
-        "data_age_seconds": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "deterministic": {
-          "type": "boolean"
-        },
-        "falsifiable_fields": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        "sources_queried": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        "sources_unavailable": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        }
-      },
-      "required": [
-        "deterministic"
-      ],
-      "type": "object"
-    }
-  },
-  "properties": {
-    "result": {
-      "anyOf": [
-        {
-          "$ref": "#/$defs/EmailVerifyResponse"
-        },
-        {
-          "$ref": "#/$defs/ErrorResponse"
-        }
-      ]
-    }
-  },
-  "required": [
-    "result"
-  ],
-  "type": "object"
-}New value: +null

Changed86 schema fields changedMay 17, 2026

removedOutput schema / $defs / EmailVerifyResponse / description

Removed value: -"Combined email validation: syntax + MX + disposable + role + free-provider.\n\nWhat we DO NOT do: SMTP `RCPT TO` deliverability probing. Hunter.io-style\nmailbox-existence checks are an ethical grey area (mailbox enumeration +\nHetzner ToS risk on unsolicited SMTP from datacenter IPs). Use Hunter.io /\nNeverBounce / ZeroBounce when you need that specific signal."

removedOutput schema / $defs / EmailVerifyResponse / properties / disposable / default
```
Removed value: -false
```

removedOutput schema / $defs / EmailVerifyResponse / properties / disposable / description

Removed value: -"True iff the domain matches our disposable-provider database OR a known disposable MX host."

removedOutput schema / $defs / EmailVerifyResponse / properties / disposable / title
```
Removed value: -"Disposable"
```
removedOutput schema / $defs / EmailVerifyResponse / properties / disposable_provider / default
```
Removed value: -null
```

removedOutput schema / $defs / EmailVerifyResponse / properties / disposable_provider / description

Removed value: -"Name of the disposable provider when `disposable=true` (e.g. 'Mailinator'). Null otherwise."

removedOutput schema / $defs / EmailVerifyResponse / properties / disposable_provider / title
```
Removed value: -"Disposable Provider"
```
removedOutput schema / $defs / EmailVerifyResponse / properties / domain / description
```
Removed value: -"The domain part (after `@`)."
```
removedOutput schema / $defs / EmailVerifyResponse / properties / domain / title
```
Removed value: -"Domain"
```
removedOutput schema / $defs / EmailVerifyResponse / properties / email / description
```
Removed value: -"Echo of the input email (lowercased, control-chars stripped)."
```
removedOutput schema / $defs / EmailVerifyResponse / properties / email / title
```
Removed value: -"Email"
```
removedOutput schema / $defs / EmailVerifyResponse / properties / free_provider / default
```
Removed value: -false
```

removedOutput schema / $defs / EmailVerifyResponse / properties / free_provider / description

Removed value: -"True iff the domain is a known consumer-mailbox provider (gmail/outlook/yahoo/proton/icloud). B2B detection signal."

removedOutput schema / $defs / EmailVerifyResponse / properties / free_provider / title
```
Removed value: -"Free Provider"
```

removedOutput schema / $defs / EmailVerifyResponse / properties / mx_records / description

Removed value: -"MX records for the domain, sorted by priority. Empty list = no MX = mail cannot be delivered."

removedOutput schema / $defs / EmailVerifyResponse / properties / mx_records / title
```
Removed value: -"Mx Records"
```
removedOutput schema / $defs / EmailVerifyResponse / properties / next_calls / default
```
Removed value: -null
```

removedOutput schema / $defs / EmailVerifyResponse / properties / next_calls / description

Removed value: -"Suggested follow-up MCP tool calls. Ordered by relevance; agents should chain these without re-prompting the user."

removedOutput schema / $defs / EmailVerifyResponse / properties / next_calls / title
```
Removed value: -"Next Calls"
```
removedOutput schema / $defs / EmailVerifyResponse / properties / role_address / default
```
Removed value: -false
```

removedOutput schema / $defs / EmailVerifyResponse / properties / role_address / description

Removed value: -"True iff the local-part is a generic role address (admin@, info@, support@, etc.) — not a specific person."

removedOutput schema / $defs / EmailVerifyResponse / properties / role_address / title
```
Removed value: -"Role Address"
```
removedOutput schema / $defs / EmailVerifyResponse / properties / role_type / default
```
Removed value: -null
```

removedOutput schema / $defs / EmailVerifyResponse / properties / role_type / description

Removed value: -"The role keyword when role_address=true (e.g. 'admin', 'noreply'). Null otherwise."

removedOutput schema / $defs / EmailVerifyResponse / properties / role_type / title
```
Removed value: -"Role Type"
```
removedOutput schema / $defs / EmailVerifyResponse / properties / summary / default
```
Removed value: -""
```
removedOutput schema / $defs / EmailVerifyResponse / properties / summary / description
```
Removed value: -"One-line human-readable summary."
```
removedOutput schema / $defs / EmailVerifyResponse / properties / summary / title
```
Removed value: -"Summary"
```

removedOutput schema / $defs / EmailVerifyResponse / properties / syntax_valid / description

Removed value: -"True iff the email passes the same RFC-aware regex used by /v1/email/disposable."

removedOutput schema / $defs / EmailVerifyResponse / properties / syntax_valid / title
```
Removed value: -"Syntax Valid"
```
removedOutput schema / $defs / EmailVerifyResponse / properties / verdict / default
```
Removed value: -null
```

removedOutput schema / $defs / EmailVerifyResponse / properties / verdict / description

Removed value: -"Falsifiability metadata: sources_queried, sources_unavailable, completeness, deterministic flag. Lets agents distinguish 'no data' from 'source failed' without re-running the call."

removedOutput schema / $defs / EmailVerifyResponse / title
```
Removed value: -"EmailVerifyResponse"
```

removedOutput schema / $defs / ErrorDetail / description

Removed value: -"Structured failure body. Codes mirror app/exceptions.AppException\nsubclasses; agent retry / upgrade decisions key off `code`, not `message`."

removedOutput schema / $defs / ErrorDetail / properties / code / description

Removed value: -"Stable machine-readable failure category. Agents key retry/upgrade decisions off this."

removedOutput schema / $defs / ErrorDetail / properties / code / title
```
Removed value: -"Code"
```
removedOutput schema / $defs / ErrorDetail / properties / docs_url / default
```
Removed value: -null
```

removedOutput schema / $defs / ErrorDetail / properties / docs_url / description

Removed value: -"Documentation pointer (e.g. tool input contract) when code='invalid_argument'."

removedOutput schema / $defs / ErrorDetail / properties / docs_url / title
```
Removed value: -"Docs Url"
```

removedOutput schema / $defs / ErrorDetail / properties / message / description

Removed value: -"Human-readable detail. Free text — never parse. Capped at 500 chars to prevent oversized upstream errors from bloating responses."

removedOutput schema / $defs / ErrorDetail / properties / message / title
```
Removed value: -"Message"
```
removedOutput schema / $defs / ErrorDetail / properties / retry_after_seconds / default
```
Removed value: -null
```

removedOutput schema / $defs / ErrorDetail / properties / retry_after_seconds / description

Removed value: -"When code='rate_limit_exceeded', the minimum seconds to wait before retrying."

removedOutput schema / $defs / ErrorDetail / properties / retry_after_seconds / title
```
Removed value: -"Retry After Seconds"
```
removedOutput schema / $defs / ErrorDetail / properties / upgrade_url / default
```
Removed value: -null
```

removedOutput schema / $defs / ErrorDetail / properties / upgrade_url / description

Removed value: -"Pricing/upgrade URL when code='tier_limit' or 'rate_limit_exceeded' on the Free tier."

removedOutput schema / $defs / ErrorDetail / properties / upgrade_url / title
```
Removed value: -"Upgrade Url"
```
removedOutput schema / $defs / ErrorDetail / title
```
Removed value: -"ErrorDetail"
```

removedOutput schema / $defs / ErrorResponse / description

Removed value: -"MCP error envelope. Tool return type is always\n`SpecificResponse | ErrorResponse` — Union flag tells the agent which arm\narrived without parsing the inner body."

removedOutput schema / $defs / ErrorResponse / title
```
Removed value: -"ErrorResponse"
```

removedOutput schema / $defs / MxDnsRecord / description

Removed value: -"Single MX record embedded inside DomainReportResponse.dns.mx."

removedOutput schema / $defs / MxDnsRecord / properties / host / default
```
Removed value: -null
```
removedOutput schema / $defs / MxDnsRecord / properties / host / description
```
Removed value: -"MX hostname (trailing dot stripped)."
```
removedOutput schema / $defs / MxDnsRecord / properties / host / title
```
Removed value: -"Host"
```
removedOutput schema / $defs / MxDnsRecord / properties / priority / default
```
Removed value: -null
```
removedOutput schema / $defs / MxDnsRecord / properties / priority / description
```
Removed value: -"MX preference (lower = higher priority)."
```
removedOutput schema / $defs / MxDnsRecord / properties / priority / title
```
Removed value: -"Priority"
```
removedOutput schema / $defs / MxDnsRecord / title
```
Removed value: -"MxDnsRecord"
```

removedOutput schema / $defs / PivotHint / description

Removed value: -"A suggested follow-up MCP tool call. Surfaced inside response.next_calls so\nLLM agents can chain related lookups without manual prompting. Each hint names\nthe tool, the input value to pass, and a short reason explaining why this\npivot adds value in the current context."

removedOutput schema / $defs / PivotHint / properties / input / description

Removed value: -"Suggested input value to pass to the tool — typically a CVE ID, CWE ID, domain, or IP. Pre-populated from the current response so the agent can call the next tool without re-deriving the argument."

removedOutput schema / $defs / PivotHint / properties / input / title
```
Removed value: -"Input"
```
removedOutput schema / $defs / PivotHint / properties / params / default
```
Removed value: -null
```

removedOutput schema / $defs / PivotHint / properties / params / description

Removed value: -"Optional extra kwargs to pass alongside `input`. Used by pivot generators when the next call benefits from a secondary parameter, e.g. {'exclude_id': 'AML.T0051'} to skip the originating technique from a sibling-tactic search. Omitted when no extra args are needed."

removedOutput schema / $defs / PivotHint / properties / params / title
```
Removed value: -"Params"
```

removedOutput schema / $defs / PivotHint / properties / reason / description

Removed value: -"Short rationale (one sentence) for why this follow-up call adds value, e.g. 'Federal patch deadline + ransomware association', 'Public exploits / PoC availability'."

removedOutput schema / $defs / PivotHint / properties / reason / title
```
Removed value: -"Reason"
```

removedOutput schema / $defs / PivotHint / properties / tool / description

Removed value: -"Canonical MCP tool name to call next. Constrained to known operation_ids in tools/list — adding a new tool here requires expanding the Literal."

removedOutput schema / $defs / PivotHint / properties / tool / title
```
Removed value: -"Tool"
```
removedOutput schema / $defs / PivotHint / title
```
Removed value: -"PivotHint"
```
removedOutput schema / $defs / Verdict / properties / completeness / default
```
Removed value: -"complete"
```

removedOutput schema / $defs / Verdict / properties / completeness / description

Removed value: -"'complete' = every planned source returned data; 'partial' = at least one source in sources_unavailable failed or was skipped; 'minimal' = only the primary/required source returned, optional enrichment missing."

removedOutput schema / $defs / Verdict / properties / completeness / title
```
Removed value: -"Completeness"
```
removedOutput schema / $defs / Verdict / properties / data_age_seconds / default
```
Removed value: -null
```

removedOutput schema / $defs / Verdict / properties / data_age_seconds / description

Removed value: -"Seconds elapsed since the oldest cached source was fetched, or null when every source was queried live for this request. Use to judge freshness."

removedOutput schema / $defs / Verdict / properties / data_age_seconds / title
```
Removed value: -"Data Age Seconds"
```

removedOutput schema / $defs / Verdict / properties / deterministic / description

Removed value: -"True when the response is fully reproducible from the listed sources for the same input at the same moment (no randomness, no model inference). False for endpoints that include probabilistic scoring or LLM output."

removedOutput schema / $defs / Verdict / properties / deterministic / title
```
Removed value: -"Deterministic"
```

removedOutput schema / $defs / Verdict / properties / falsifiable_fields / description

Removed value: -"Top-level response fields whose values a caller can independently re-derive from the named upstream sources (e.g. 'dns', 'ssl', 'whois'). Fields not in this list are derived/computed and cannot be directly re-verified."

removedOutput schema / $defs / Verdict / properties / falsifiable_fields / title
```
Removed value: -"Falsifiable Fields"
```

removedOutput schema / $defs / Verdict / properties / sources_queried / description

Removed value: -"Canonical source identifiers successfully consulted for this response (e.g. 'ripe_stat', 'shodan_internetdb', 'firehol'). Agent-readable list, order not significant."

removedOutput schema / $defs / Verdict / properties / sources_queried / title
```
Removed value: -"Sources Queried"
```

removedOutput schema / $defs / Verdict / properties / sources_unavailable / description

Removed value: -"Sources that were expected but not returned — either intentionally skipped (lite mode, tier gating) or failed (quota, timeout, upstream down). Empty list means every planned source produced data."

removedOutput schema / $defs / Verdict / properties / sources_unavailable / title
```
Removed value: -"Sources Unavailable"
```
removedOutput schema / $defs / Verdict / title
```
Removed value: -"Verdict"
```
removedOutput schema / properties / result / title
```
Removed value: -"Result"
```
removedOutput schema / title
```
Removed value: -"email_verifyOutput"
```

Changed1 schema field changedMay 15, 2026

changedOutput schema / $defs / PivotHint / properties / tool / enum

Previous value: -[
-  "cve_lookup",
-  "cve_search",
-  "cve_leading",
-  "bulk_cve_lookup",
-  "calculate_risk_score",
-  "get_cvss_details",
-  "exploit_lookup",
-  "kev_detail",
-  "cwe_lookup",
-  "subdomain_enum",
-  "ssl_check",
-  "tech_fingerprint",
-  "asn_lookup",
-  "ip_lookup",
-  "ioc_lookup",
-  "bulk_ioc_lookup",
-  "hash_lookup",
-  "threat_intel",
-  "threat_report",
-  "audit_domain",
-  "domain_report",
-  "dns_lookup",
-  "whois_lookup",
-  "wayback_lookup",
-  "scan_headers",
-  "check_headers",
-  "check_secrets",
-  "check_injection",
-  "check_dependencies",
-  "email_mx",
-  "email_security_posture",
-  "email_disposable",
-  "email_verify",
-  "robots_txt",
-  "redirect_chain",
-  "brand_assets",
-  "seo_audit",
-  "phone_lookup",
-  "username_lookup",
-  "password_check",
-  "phishing_check",
-  "atlas_technique_lookup",
-  "atlas_technique_search",
-  "bulk_atlas_technique_lookup",
-  "atlas_case_study_lookup",
-  "atlas_case_study_search",
-  "d3fend_defense_lookup",
-  "d3fend_defense_search",
-  "d3fend_defense_for_attack",
-  "d3fend_attack_coverage",
-  "sigma_rule_lookup",
-  "bulk_sigma_rule_lookup"
-]New value: +[
+  "cve_lookup",
+  "cve_search",
+  "cve_leading",
+  "bulk_cve_lookup",
+  "calculate_risk_score",
+  "get_cvss_details",
+  "exploit_lookup",
+  "kev_detail",
+  "cwe_lookup",
+  "subdomain_enum",
+  "ssl_check",
+  "tech_fingerprint",
+  "asn_lookup",
+  "ip_lookup",
+  "ioc_lookup",
+  "bulk_ioc_lookup",
+  "hash_lookup",
+  "threat_intel",
+  "threat_report",
+  "audit_domain",
+  "domain_report",
+  "dns_lookup",
+  "whois_lookup",
+  "wayback_lookup",
+  "scan_headers",
+  "check_headers",
+  "check_secrets",
+  "check_injection",
+  "check_dependencies",
+  "email_mx",
+  "email_security_posture",
+  "email_disposable",
+  "email_verify",
+  "robots_txt",
+  "redirect_chain",
+  "brand_assets",
+  "seo_audit",
+  "phone_lookup",
+  "username_lookup",
+  "password_check",
+  "phishing_check",
+  "atlas_technique_lookup",
+  "atlas_technique_search",
+  "bulk_atlas_technique_lookup",
+  "atlas_case_study_lookup",
+  "atlas_case_study_search",
+  "d3fend_defense_lookup",
+  "d3fend_defense_search",
+  "d3fend_defense_for_attack",
+  "d3fend_attack_coverage",
+  "sigma_rule_lookup",
+  "bulk_sigma_rule_lookup",
+  "tech_stack_cve_audit"
+]

Changed1 schema field changedMay 12, 2026

changedOutput schema / $defs / PivotHint / properties / tool / enum

Previous value: -[
-  "cve_lookup",
-  "cve_search",
-  "cve_leading",
-  "bulk_cve_lookup",
-  "calculate_risk_score",
-  "get_cvss_details",
-  "exploit_lookup",
-  "kev_detail",
-  "cwe_lookup",
-  "subdomain_enum",
-  "ssl_check",
-  "tech_fingerprint",
-  "asn_lookup",
-  "ip_lookup",
-  "ioc_lookup",
-  "bulk_ioc_lookup",
-  "hash_lookup",
-  "threat_intel",
-  "threat_report",
-  "audit_domain",
-  "domain_report",
-  "dns_lookup",
-  "whois_lookup",
-  "wayback_lookup",
-  "scan_headers",
-  "check_headers",
-  "check_secrets",
-  "check_injection",
-  "check_dependencies",
-  "email_mx",
-  "email_security_posture",
-  "email_disposable",
-  "email_verify",
-  "robots_txt",
-  "redirect_chain",
-  "brand_assets",
-  "seo_audit",
-  "phone_lookup",
-  "username_lookup",
-  "password_check",
-  "phishing_check",
-  "atlas_technique_lookup",
-  "atlas_technique_search",
-  "bulk_atlas_technique_lookup",
-  "atlas_case_study_lookup",
-  "atlas_case_study_search",
-  "d3fend_defense_lookup",
-  "d3fend_defense_search",
-  "d3fend_defense_for_attack",
-  "d3fend_attack_coverage"
-]New value: +[
+  "cve_lookup",
+  "cve_search",
+  "cve_leading",
+  "bulk_cve_lookup",
+  "calculate_risk_score",
+  "get_cvss_details",
+  "exploit_lookup",
+  "kev_detail",
+  "cwe_lookup",
+  "subdomain_enum",
+  "ssl_check",
+  "tech_fingerprint",
+  "asn_lookup",
+  "ip_lookup",
+  "ioc_lookup",
+  "bulk_ioc_lookup",
+  "hash_lookup",
+  "threat_intel",
+  "threat_report",
+  "audit_domain",
+  "domain_report",
+  "dns_lookup",
+  "whois_lookup",
+  "wayback_lookup",
+  "scan_headers",
+  "check_headers",
+  "check_secrets",
+  "check_injection",
+  "check_dependencies",
+  "email_mx",
+  "email_security_posture",
+  "email_disposable",
+  "email_verify",
+  "robots_txt",
+  "redirect_chain",
+  "brand_assets",
+  "seo_audit",
+  "phone_lookup",
+  "username_lookup",
+  "password_check",
+  "phishing_check",
+  "atlas_technique_lookup",
+  "atlas_technique_search",
+  "bulk_atlas_technique_lookup",
+  "atlas_case_study_lookup",
+  "atlas_case_study_search",
+  "d3fend_defense_lookup",
+  "d3fend_defense_search",
+  "d3fend_defense_for_attack",
+  "d3fend_attack_coverage",
+  "sigma_rule_lookup",
+  "bulk_sigma_rule_lookup"
+]

Changed1 schema field changedMay 12, 2026

changedOutput schema / $defs / PivotHint / properties / tool / enum

Previous value: -[
-  "cve_lookup",
-  "cve_search",
-  "cve_leading",
-  "bulk_cve_lookup",
-  "calculate_risk_score",
-  "get_cvss_details",
-  "exploit_lookup",
-  "kev_detail",
-  "cwe_lookup",
-  "subdomain_enum",
-  "ssl_check",
-  "tech_fingerprint",
-  "asn_lookup",
-  "ip_lookup",
-  "ioc_lookup",
-  "bulk_ioc_lookup",
-  "hash_lookup",
-  "threat_intel",
-  "threat_report",
-  "audit_domain",
-  "domain_report",
-  "dns_lookup",
-  "whois_lookup",
-  "wayback_lookup",
-  "scan_headers",
-  "check_headers",
-  "check_secrets",
-  "check_injection",
-  "check_dependencies",
-  "email_mx",
-  "email_disposable",
-  "email_verify",
-  "robots_txt",
-  "redirect_chain",
-  "brand_assets",
-  "seo_audit",
-  "phone_lookup",
-  "username_lookup",
-  "password_check",
-  "phishing_check",
-  "atlas_technique_lookup",
-  "atlas_technique_search",
-  "bulk_atlas_technique_lookup",
-  "atlas_case_study_lookup",
-  "atlas_case_study_search",
-  "d3fend_defense_lookup",
-  "d3fend_defense_search",
-  "d3fend_defense_for_attack",
-  "d3fend_attack_coverage"
-]New value: +[
+  "cve_lookup",
+  "cve_search",
+  "cve_leading",
+  "bulk_cve_lookup",
+  "calculate_risk_score",
+  "get_cvss_details",
+  "exploit_lookup",
+  "kev_detail",
+  "cwe_lookup",
+  "subdomain_enum",
+  "ssl_check",
+  "tech_fingerprint",
+  "asn_lookup",
+  "ip_lookup",
+  "ioc_lookup",
+  "bulk_ioc_lookup",
+  "hash_lookup",
+  "threat_intel",
+  "threat_report",
+  "audit_domain",
+  "domain_report",
+  "dns_lookup",
+  "whois_lookup",
+  "wayback_lookup",
+  "scan_headers",
+  "check_headers",
+  "check_secrets",
+  "check_injection",
+  "check_dependencies",
+  "email_mx",
+  "email_security_posture",
+  "email_disposable",
+  "email_verify",
+  "robots_txt",
+  "redirect_chain",
+  "brand_assets",
+  "seo_audit",
+  "phone_lookup",
+  "username_lookup",
+  "password_check",
+  "phishing_check",
+  "atlas_technique_lookup",
+  "atlas_technique_search",
+  "bulk_atlas_technique_lookup",
+  "atlas_case_study_lookup",
+  "atlas_case_study_search",
+  "d3fend_defense_lookup",
+  "d3fend_defense_search",
+  "d3fend_defense_for_attack",
+  "d3fend_attack_coverage"
+]

Changed1 schema field changedMay 8, 2026

changedOutput schema / $defs / PivotHint / properties / tool / enum

Previous value: -[
-  "cve_lookup",
-  "cve_search",
-  "cve_leading",
-  "bulk_cve_lookup",
-  "exploit_lookup",
-  "kev_detail",
-  "cwe_lookup",
-  "subdomain_enum",
-  "ssl_check",
-  "tech_fingerprint",
-  "asn_lookup",
-  "ip_lookup",
-  "ioc_lookup",
-  "bulk_ioc_lookup",
-  "hash_lookup",
-  "threat_intel",
-  "threat_report",
-  "audit_domain",
-  "domain_report",
-  "dns_lookup",
-  "whois_lookup",
-  "wayback_lookup",
-  "scan_headers",
-  "check_headers",
-  "check_secrets",
-  "check_injection",
-  "check_dependencies",
-  "email_mx",
-  "email_disposable",
-  "email_verify",
-  "robots_txt",
-  "redirect_chain",
-  "brand_assets",
-  "seo_audit",
-  "phone_lookup",
-  "username_lookup",
-  "password_check",
-  "phishing_check",
-  "atlas_technique_lookup",
-  "atlas_technique_search",
-  "bulk_atlas_technique_lookup",
-  "atlas_case_study_lookup",
-  "atlas_case_study_search",
-  "d3fend_defense_lookup",
-  "d3fend_defense_search",
-  "d3fend_defense_for_attack",
-  "d3fend_attack_coverage"
-]New value: +[
+  "cve_lookup",
+  "cve_search",
+  "cve_leading",
+  "bulk_cve_lookup",
+  "calculate_risk_score",
+  "get_cvss_details",
+  "exploit_lookup",
+  "kev_detail",
+  "cwe_lookup",
+  "subdomain_enum",
+  "ssl_check",
+  "tech_fingerprint",
+  "asn_lookup",
+  "ip_lookup",
+  "ioc_lookup",
+  "bulk_ioc_lookup",
+  "hash_lookup",
+  "threat_intel",
+  "threat_report",
+  "audit_domain",
+  "domain_report",
+  "dns_lookup",
+  "whois_lookup",
+  "wayback_lookup",
+  "scan_headers",
+  "check_headers",
+  "check_secrets",
+  "check_injection",
+  "check_dependencies",
+  "email_mx",
+  "email_disposable",
+  "email_verify",
+  "robots_txt",
+  "redirect_chain",
+  "brand_assets",
+  "seo_audit",
+  "phone_lookup",
+  "username_lookup",
+  "password_check",
+  "phishing_check",
+  "atlas_technique_lookup",
+  "atlas_technique_search",
+  "bulk_atlas_technique_lookup",
+  "atlas_case_study_lookup",
+  "atlas_case_study_search",
+  "d3fend_defense_lookup",
+  "d3fend_defense_search",
+  "d3fend_defense_for_attack",
+  "d3fend_attack_coverage"
+]

AddedMay 2, 2026

TDQS

A4.7/5.0

Behavior5/5

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

Beyond the readOnly/idempotent annotations, the description adds concrete behavioral details: how role_address is detected (admin@, info@), that Gmail-style +tag is stripped before classification, free_provider semantics for B2B detection, rate limits (30/hr free, 500/hr Pro), and the ethical decision to omit mailbox enumeration. This provides a full transparency picture without contradicting annotations.

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 information-dense but every clause serves a purpose: functionality, usage timing, exclusions, behavior details, rate limits, and return fields. It is front-loaded with the main purpose and flows logically, earning a high score for efficiency and structure.

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?

Given the tool has one parameter and an output schema (which covers return values), the description covers all necessary context: when to use, what it does, what it deliberately excludes, rate limits, and the exact output fields. No critical gaps remain for an agent to correctly select and invoke the tool.

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?

The schema already fully documents the 'email' parameter with examples and the requirement for '@'. The description adds a bit of behavior context (e.g., +tag stripping) but does not fundamentally add new parameter-level semantics beyond what the schema provides. With schema coverage at 100%, the baseline of 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?

The description immediately states the tool validates emails by combining syntax checks, MX records, disposable detection, role-address detection, and free-provider classification. It explicitly distinguishes itself from sibling tools by noting it replaces email_mx + email_disposable + manual role parsing, making the purpose highly specific and well-differentiated.

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?

The description gives clear usage contexts: 'Use BEFORE adding an email to a contact list, sending an outbound message, or auditing a lead-list dump.' It also explicitly states what the tool does NOT do (SMTP RCPT TO deliverability probing) and points to alternative external services for that case, providing both when-to-use and when-not-to-use guidance.

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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TDQS

A4.5/5.0

Disambiguation4/5

Most tools have clearly distinct purposes, with differences between lookup/search/scan/audit for each domain. However, some overlap exists (e.g., email_mx vs email_security_posture, scan_headers vs contrast_scan) which could cause occasional confusion. Overall, boundaries are well-defined.

Naming Consistency5/5

Tool names follow a consistent verb_noun pattern (e.g., cve_lookup, check_headers, bulk_cve_lookup) with all lowercase underscores. Variations like kev_detail or ssl_check are minor and still predictable. No chaotic mixing of conventions.

Tool Count4/5

54 tools is high but justified by the broad cybersecurity scope (CVE, ATLAS, D3FEND, Sigma, domain, email, IOC, scanning). Some redundancy exists (e.g., three email-related tools), but the count is not excessive given the API's comprehensive feature set.

Completeness5/5

The tool set thoroughly covers the threat intelligence and domain investigation lifecycle: CVE/KEV/exploit/CWE, ATLAS/D3FEND/Sigma, DNS/WHOIS/SSL/subdomains, email security, IOC enrichment, and active scanning. No significant gaps are apparent for the stated cybersecurity purpose.

Email Verify

Input Schema

Output Schema

Schema Changelog

TDQS

Glama MCP Gateway

TDQS

Resources