Mailtrap — the complete, unedited output of the deterministic mcptrustchecker engine v1.13.0, scanned . Every finding, capability tag and score component below is exactly what the engine produced — no AI, no post-processing.
{
"tool": {
"name": "mcptrustchecker",
"version": "1.13.0",
"methodologyVersion": "mcptrustchecker-1.13"
},
"target": {
"id": "mcp-mailtrap",
"source": {
"kind": "package",
"origin": "mcp-mailtrap"
},
"server": {
"name": "mcp-mailtrap"
}
},
"grade": "A",
"score": {
"score": 96,
"threatScore": 100,
"grade": "A",
"band": "A",
"categorySubtotals": {
"injection": 0,
"exfiltration": 0,
"permissions": 0,
"supply-chain": 0,
"network": 0,
"hygiene": 0
},
"vector": [
{
"kind": "client",
"term": "capability-exposure",
"level": "moderate",
"label": "capability blast radius (moderate) — client exposure if the model is manipulated",
"appliedPenalty": 3
},
{
"kind": "client",
"term": "verification-discount",
"level": "repo",
"label": "publisher verification (public source) — no provenance, but the source is public and inspectable",
"appliedPenalty": 1
},
{
"kind": "client",
"term": "coverage-honesty",
"level": "source",
"label": "inspection depth (source) — how much of the target the scan could see",
"appliedPenalty": 0
}
],
"gatesFired": [],
"methodologyVersion": "mcptrustchecker-1.13"
},
"capability": {
"level": "moderate",
"reasons": [
"ingests untrusted external content (a prompt-injection entry point)",
"can send data / act on an external service"
],
"tags": [
"external-sink",
"untrusted-input"
]
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": true,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"Tools were statically extracted from the published source (125 recovered), not enumerated from a running server. Tool-poisoning, Unicode-smuggling, capability and toxic-flow analysis ran on this inferred surface, but a mis-parsed registration could be missed or mis-attributed, so tool-derived findings are capped below “confirmed”. To grade the real runtime surface, scan the running server: --command \"npx -y <package>\"."
]
},
"findings": [
{
"ruleId": "MTC-FLOW-005",
"title": "Untrusted input can drive an external action",
"category": "exfiltration",
"severity": "medium",
"confidence": "strong",
"description": "Untrusted-input tools ([get-sandbox-attachment, create-contact-export, get-contact-export, list-inbound-messages, get-inbound-message, list-inbound-threads]) co-exist with external-action tools ([send-email, create-webhook, update-webhook, delete-webhook]). A prompt injection could cause unwanted external actions, though no direct sensitive-data leak path was found.",
"remediation": "Require confirmation for state-changing/egress actions triggered after processing untrusted content.",
"location": {
"kind": "flow",
"name": "get-sandbox-attachment → send-email"
},
"evidence": "untrusted [get-sandbox-attachment, create-contact-export, get-contact-export, list-inbound-messages, get-inbound-message, list-inbound-threads] → sinks [send-em",
"owasp": "LLM06:2025 Excessive Agency",
"references": [],
"data": {
"untrusted": [
"get-sandbox-attachment",
"create-contact-export",
"get-contact-export",
"list-inbound-messages",
"get-inbound-message",
"list-inbound-threads"
],
"sinks": [
"send-email",
"create-webhook",
"update-webhook",
"delete-webhook"
]
}
}
],
"toxicFlows": [
{
"id": "flow-1",
"severity": "medium",
"confidence": "strong",
"untrustedInput": [
"get-sandbox-attachment",
"create-contact-export",
"get-contact-export",
"list-inbound-messages",
"get-inbound-message",
"list-inbound-threads"
],
"sensitiveSource": [],
"externalSink": [
"send-email",
"create-webhook",
"update-webhook",
"delete-webhook"
],
"selfContained": false,
"description": "Untrusted input can drive an external action even though no sensitive source is exposed."
}
],
"capabilities": [
{
"tool": "send-email",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"send_email\""
]
}
},
{
"tool": "batch-send-transactional-email",
"tags": [],
"reasons": {}
},
{
"tool": "batch-send-bulk-email",
"tags": [],
"reasons": {}
},
{
"tool": "create-template",
"tags": [],
"reasons": {}
},
{
"tool": "list-templates",
"tags": [],
"reasons": {}
},
{
"tool": "get-template",
"tags": [],
"reasons": {}
},
{
"tool": "update-template",
"tags": [],
"reasons": {}
},
{
"tool": "delete-template",
"tags": [],
"reasons": {}
},
{
"tool": "send-sandbox-email",
"tags": [],
"reasons": {}
},
{
"tool": "batch-send-sandbox-email",
"tags": [],
"reasons": {}
},
{
"tool": "get-sandbox-messages",
"tags": [],
"reasons": {}
},
{
"tool": "show-sandbox-email-message",
"tags": [],
"reasons": {}
},
{
"tool": "list-sandbox-projects",
"tags": [],
"reasons": {}
},
{
"tool": "create-sandbox-project",
"tags": [],
"reasons": {}
},
{
"tool": "get-sandbox-project",
"tags": [],
"reasons": {}
},
{
"tool": "update-sandbox-project",
"tags": [],
"reasons": {}
},
{
"tool": "delete-sandbox-project",
"tags": [],
"reasons": {}
},
{
"tool": "create-sandbox-inbox",
"tags": [],
"reasons": {}
},
{
"tool": "get-sandbox-inbox",
"tags": [],
"reasons": {}
},
{
"tool": "update-sandbox-inbox",
"tags": [],
"reasons": {}
},
{
"tool": "delete-sandbox-inbox",
"tags": [],
"reasons": {}
},
{
"tool": "clean-sandbox-inbox",
"tags": [],
"reasons": {}
},
{
"tool": "list-sandboxes",
"tags": [],
"reasons": {}
},
{
"tool": "mark-sandbox-as-read",
"tags": [],
"reasons": {}
},
{
"tool": "reset-sandbox-credentials",
"tags": [],
"reasons": {}
},
{
"tool": "enable-sandbox-email-address",
"tags": [],
"reasons": {}
},
{
"tool": "reset-sandbox-email-address",
"tags": [],
"reasons": {}
},
{
"tool": "forward-sandbox-message",
"tags": [],
"reasons": {}
},
{
"tool": "update-sandbox-message",
"tags": [],
"reasons": {}
},
{
"tool": "delete-sandbox-message",
"tags": [],
"reasons": {}
},
{
"tool": "get-sandbox-message-spam-score",
"tags": [],
"reasons": {}
},
{
"tool": "get-sandbox-message-html-analysis",
"tags": [],
"reasons": {}
},
{
"tool": "get-sandbox-message-headers",
"tags": [],
"reasons": {}
},
{
"tool": "get-sandbox-message-html",
"tags": [],
"reasons": {}
},
{
"tool": "get-sandbox-message-text",
"tags": [],
"reasons": {}
},
{
"tool": "get-sandbox-message-raw",
"tags": [],
"reasons": {}
},
{
"tool": "get-sandbox-message-eml",
"tags": [],
"reasons": {}
},
{
"tool": "get-sandbox-message-html-source",
"tags": [],
"reasons": {}
},
{
"tool": "list-sandbox-attachments",
"tags": [],
"reasons": {}
},
{
"tool": "get-sandbox-attachment",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"download\""
]
}
},
{
"tool": "get-sending-stats",
"tags": [],
"reasons": {}
},
{
"tool": "list-email-logs",
"tags": [],
"reasons": {}
},
{
"tool": "get-email-log-message",
"tags": [],
"reasons": {}
},
{
"tool": "list-sending-domains",
"tags": [],
"reasons": {}
},
{
"tool": "get-sending-domain",
"tags": [],
"reasons": {}
},
{
"tool": "create-sending-domain",
"tags": [],
"reasons": {}
},
{
"tool": "update-sending-domain",
"tags": [],
"reasons": {}
},
{
"tool": "delete-sending-domain",
"tags": [],
"reasons": {}
},
{
"tool": "send-sending-domain-setup-instructions",
"tags": [],
"reasons": {}
},
{
"tool": "get-company-info",
"tags": [],
"reasons": {}
},
{
"tool": "create-company-info",
"tags": [],
"reasons": {}
},
{
"tool": "update-company-info",
"tags": [],
"reasons": {}
},
{
"tool": "list-suppressions",
"tags": [],
"reasons": {}
},
{
"tool": "create-suppression",
"tags": [],
"reasons": {}
},
{
"tool": "delete-suppression",
"tags": [],
"reasons": {}
},
{
"tool": "list-tracking-opt-outs",
"tags": [],
"reasons": {}
},
{
"tool": "create-tracking-opt-out",
"tags": [],
"reasons": {}
},
{
"tool": "delete-tracking-opt-out",
"tags": [],
"reasons": {}
},
{
"tool": "list-webhooks",
"tags": [],
"reasons": {}
},
{
"tool": "get-webhook",
"tags": [],
"reasons": {}
},
{
"tool": "create-webhook",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"webhook\""
]
}
},
{
"tool": "update-webhook",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"webhook\""
]
}
},
{
"tool": "delete-webhook",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"webhook\""
]
}
},
{
"tool": "get-contact",
"tags": [],
"reasons": {}
},
{
"tool": "create-contact",
"tags": [],
"reasons": {}
},
{
"tool": "update-contact",
"tags": [],
"reasons": {}
},
{
"tool": "delete-contact",
"tags": [],
"reasons": {}
},
{
"tool": "create-contact-event",
"tags": [],
"reasons": {}
},
{
"tool": "list-contact-lists",
"tags": [],
"reasons": {}
},
{
"tool": "get-contact-list",
"tags": [],
"reasons": {}
},
{
"tool": "create-contact-list",
"tags": [],
"reasons": {}
},
{
"tool": "update-contact-list",
"tags": [],
"reasons": {}
},
{
"tool": "delete-contact-list",
"tags": [],
"reasons": {}
},
{
"tool": "list-contact-fields",
"tags": [],
"reasons": {}
},
{
"tool": "get-contact-field",
"tags": [],
"reasons": {}
},
{
"tool": "create-contact-field",
"tags": [],
"reasons": {}
},
{
"tool": "update-contact-field",
"tags": [],
"reasons": {}
},
{
"tool": "delete-contact-field",
"tags": [],
"reasons": {}
},
{
"tool": "create-contact-import",
"tags": [],
"reasons": {}
},
{
"tool": "get-contact-import",
"tags": [],
"reasons": {}
},
{
"tool": "create-contact-export",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"download\""
]
}
},
{
"tool": "get-contact-export",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"download\""
]
}
},
{
"tool": "list-email-campaigns",
"tags": [],
"reasons": {}
},
{
"tool": "get-email-campaign",
"tags": [],
"reasons": {}
},
{
"tool": "create-email-campaign",
"tags": [],
"reasons": {}
},
{
"tool": "update-email-campaign",
"tags": [],
"reasons": {}
},
{
"tool": "delete-email-campaign",
"tags": [],
"reasons": {}
},
{
"tool": "start-email-campaign",
"tags": [],
"reasons": {}
},
{
"tool": "schedule-email-campaign",
"tags": [],
"reasons": {}
},
{
"tool": "cancel-email-campaign",
"tags": [],
"reasons": {}
},
{
"tool": "terminate-email-campaign",
"tags": [],
"reasons": {}
},
{
"tool": "reset-email-campaign",
"tags": [],
"reasons": {}
},
{
"tool": "get-email-campaign-stats",
"tags": [],
"reasons": {}
},
{
"tool": "list-accounts",
"tags": [],
"reasons": {}
},
{
"tool": "get-billing-usage",
"tags": [],
"reasons": {}
},
{
"tool": "list-account-accesses",
"tags": [],
"reasons": {}
},
{
"tool": "remove-account-access",
"tags": [],
"reasons": {}
},
{
"tool": "get-permission-resources",
"tags": [],
"reasons": {}
},
{
"tool": "bulk-update-permissions",
"tags": [],
"reasons": {}
},
{
"tool": "list-api-tokens",
"tags": [],
"reasons": {}
},
{
"tool": "create-api-token",
"tags": [],
"reasons": {}
},
{
"tool": "get-api-token",
"tags": [],
"reasons": {}
},
{
"tool": "reset-api-token",
"tags": [],
"reasons": {}
},
{
"tool": "delete-api-token",
"tags": [],
"reasons": {}
},
{
"tool": "list-sub-accounts",
"tags": [],
"reasons": {}
},
{
"tool": "create-sub-account",
"tags": [],
"reasons": {}
},
{
"tool": "list-inbound-folders",
"tags": [],
"reasons": {}
},
{
"tool": "get-inbound-folder",
"tags": [],
"reasons": {}
},
{
"tool": "create-inbound-folder",
"tags": [],
"reasons": {}
},
{
"tool": "update-inbound-folder",
"tags": [],
"reasons": {}
},
{
"tool": "delete-inbound-folder",
"tags": [],
"reasons": {}
},
{
"tool": "list-inbound-inboxes",
"tags": [],
"reasons": {}
},
{
"tool": "get-inbound-inbox",
"tags": [],
"reasons": {}
},
{
"tool": "create-inbound-inbox",
"tags": [],
"reasons": {}
},
{
"tool": "update-inbound-inbox",
"tags": [],
"reasons": {}
},
{
"tool": "delete-inbound-inbox",
"tags": [],
"reasons": {}
},
{
"tool": "list-inbound-messages",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "get-inbound-message",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"download\""
]
}
},
{
"tool": "delete-inbound-message",
"tags": [],
"reasons": {}
},
{
"tool": "reply-to-inbound-message",
"tags": [],
"reasons": {}
},
{
"tool": "reply-all-to-inbound-message",
"tags": [],
"reasons": {}
},
{
"tool": "forward-inbound-message",
"tags": [],
"reasons": {}
},
{
"tool": "list-inbound-threads",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "get-inbound-thread",
"tags": [],
"reasons": {}
},
{
"tool": "delete-inbound-thread",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "46b1088651935d14c5cfa9d630bb96377641d9283021212936780ea746ea6d9f",
"stats": {
"tools": 125,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 0,
"medium": 1,
"low": 0,
"info": 0
}
}
}