Localstack — 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": "@giovane.martins/localstack",
"source": {
"kind": "package",
"origin": "@giovane.martins/localstack"
},
"server": {
"name": "@giovane.martins/localstack"
}
},
"grade": "A",
"score": {
"score": 93,
"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": "high",
"label": "capability blast radius (high) — client exposure if the model is manipulated",
"appliedPenalty": 6
},
{
"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": "high",
"reasons": [
"ingests untrusted external content (a prompt-injection entry point)",
"can send data / act on an external service",
"can create, modify or delete files",
"reads sensitive or local data",
"has a read → egress path (a data-exfiltration surface)",
"untrusted-input, sensitive-source and egress co-exist across tools (toxic-flow surface)"
],
"tags": [
"file-write",
"untrusted-input",
"sensitive-source",
"external-sink"
]
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": true,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"Tools were statically extracted from the published source (73 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-002",
"title": "Completed toxic-flow trifecta across tools",
"category": "exfiltration",
"severity": "critical",
"confidence": "strong",
"description": "This server (without client built-ins) exposes a complete data-exfiltration chain: s3_get_object → secretsmanager_get_secret → ses_send_email. Untrusted input is ingested, private data is read, and it can be sent to an external sink via the agent composing the tools (→). Static analysis proves the primitive exists, not that a specific run will occur.",
"remediation": "Remove one leg of the trifecta: isolate untrusted-input tools from secret-reading tools and from egress tools, or require human approval between them.",
"location": {
"kind": "flow",
"name": "s3_get_object → secretsmanager_get_secret → ses_send_email"
},
"owasp": "LLM02:2025 Sensitive Information Disclosure",
"references": [],
"data": {
"untrusted": [
"s3_get_object"
],
"sources": [
"secretsmanager_list_secrets",
"secretsmanager_get_secret"
],
"sinks": [
"ses_send_email",
"sqs_send_message"
],
"path": [
"s3_get_object",
"secretsmanager_get_secret",
"ses_send_email"
],
"edges": [
{
"from": "s3_get_object",
"to": "secretsmanager_get_secret",
"kind": "agent-mediated"
},
{
"from": "secretsmanager_get_secret",
"to": "ses_send_email",
"kind": "agent-mediated"
}
],
"wired": false
}
},
{
"ruleId": "MTC-CAP-002",
"title": "Tool \"s3_put_object\" can modify the filesystem",
"category": "permissions",
"severity": "medium",
"confidence": "strong",
"description": "Tool \"s3_put_object\" can write, overwrite or delete files (keyword \"put_object\" in tool name). Verify it is scoped to a safe directory.",
"remediation": "Constrain file operations to an explicit, non-sensitive root; reject path traversal.",
"location": {
"kind": "tool",
"name": "s3_put_object"
},
"data": {
"tags": [
"file-write"
]
}
},
{
"ruleId": "MTC-CAP-005",
"title": "Mutating tool \"s3_put_object\" declares no destructiveHint",
"category": "hygiene",
"severity": "low",
"confidence": "heuristic",
"description": "Tool \"s3_put_object\" can mutate/egress but declares no destructiveHint. Clients that don't default to spec-safe behavior may not prompt before running it.",
"remediation": "Declare accurate annotations, and gate destructive tools on user confirmation regardless.",
"location": {
"kind": "tool",
"name": "s3_put_object"
},
"data": {
"tags": [
"file-write"
]
}
},
{
"ruleId": "MTC-SUP-012",
"title": "Package has no license",
"category": "hygiene",
"severity": "info",
"confidence": "strong",
"description": "\"@giovane.martins/localstack\" has no declared license. This is a legal/reuse concern, not a security finding.",
"location": {
"kind": "package",
"name": "@giovane.martins/localstack"
}
}
],
"toxicFlows": [
{
"id": "flow-1",
"severity": "critical",
"confidence": "strong",
"untrustedInput": [
"s3_get_object"
],
"sensitiveSource": [
"secretsmanager_list_secrets",
"secretsmanager_get_secret"
],
"externalSink": [
"ses_send_email",
"sqs_send_message"
],
"selfContained": false,
"path": [
"s3_get_object",
"secretsmanager_get_secret",
"ses_send_email"
],
"pathWired": false,
"description": "A cross-tool exfiltration chain exists: s3_get_object → secretsmanager_get_secret → ses_send_email."
}
],
"capabilities": [
{
"tool": "dynamodb_list_tables",
"tags": [],
"reasons": {}
},
{
"tool": "dynamodb_create_table",
"tags": [],
"reasons": {}
},
{
"tool": "dynamodb_delete_table",
"tags": [],
"reasons": {}
},
{
"tool": "dynamodb_describe_table",
"tags": [],
"reasons": {}
},
{
"tool": "dynamodb_put_item",
"tags": [],
"reasons": {}
},
{
"tool": "dynamodb_get_item",
"tags": [],
"reasons": {}
},
{
"tool": "dynamodb_delete_item",
"tags": [],
"reasons": {}
},
{
"tool": "dynamodb_scan",
"tags": [],
"reasons": {}
},
{
"tool": "dynamodb_query",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_list_buses",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_create_bus",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_delete_bus",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_list_rules",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_put_rule",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_delete_rule",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_describe_rule",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_enable_rule",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_disable_rule",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_put_targets",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_list_targets",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_remove_targets",
"tags": [],
"reasons": {}
},
{
"tool": "eventbridge_put_events",
"tags": [],
"reasons": {}
},
{
"tool": "kinesis_list_streams",
"tags": [],
"reasons": {}
},
{
"tool": "kinesis_create_stream",
"tags": [],
"reasons": {}
},
{
"tool": "kinesis_delete_stream",
"tags": [],
"reasons": {}
},
{
"tool": "kinesis_describe_stream",
"tags": [],
"reasons": {}
},
{
"tool": "kinesis_put_record",
"tags": [],
"reasons": {}
},
{
"tool": "kinesis_put_records",
"tags": [],
"reasons": {}
},
{
"tool": "kinesis_get_records",
"tags": [],
"reasons": {}
},
{
"tool": "lambda_list_functions",
"tags": [],
"reasons": {}
},
{
"tool": "lambda_get_function",
"tags": [],
"reasons": {}
},
{
"tool": "lambda_create_function",
"tags": [],
"reasons": {}
},
{
"tool": "lambda_delete_function",
"tags": [],
"reasons": {}
},
{
"tool": "lambda_invoke",
"tags": [],
"reasons": {}
},
{
"tool": "s3_list_buckets",
"tags": [],
"reasons": {}
},
{
"tool": "s3_create_bucket",
"tags": [],
"reasons": {}
},
{
"tool": "s3_delete_bucket",
"tags": [],
"reasons": {}
},
{
"tool": "s3_put_object",
"tags": [
"file-write"
],
"reasons": {
"file-write": [
"keyword \"put_object\" in tool name"
]
}
},
{
"tool": "s3_get_object",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"download\""
]
}
},
{
"tool": "s3_delete_object",
"tags": [],
"reasons": {}
},
{
"tool": "s3_list_objects",
"tags": [],
"reasons": {}
},
{
"tool": "secretsmanager_list_secrets",
"tags": [
"sensitive-source"
],
"reasons": {
"sensitive-source": [
"keyword \"list_secrets\""
]
}
},
{
"tool": "secretsmanager_create_secret",
"tags": [],
"reasons": {}
},
{
"tool": "secretsmanager_get_secret",
"tags": [
"sensitive-source"
],
"reasons": {
"sensitive-source": [
"keyword \"get_secret\""
]
}
},
{
"tool": "secretsmanager_update_secret",
"tags": [],
"reasons": {}
},
{
"tool": "secretsmanager_describe_secret",
"tags": [],
"reasons": {}
},
{
"tool": "secretsmanager_delete_secret",
"tags": [],
"reasons": {}
},
{
"tool": "secretsmanager_restore_secret",
"tags": [],
"reasons": {}
},
{
"tool": "ses_list_identities",
"tags": [],
"reasons": {}
},
{
"tool": "ses_verify_email_identity",
"tags": [],
"reasons": {}
},
{
"tool": "ses_get_identity_verification_attributes",
"tags": [],
"reasons": {}
},
{
"tool": "ses_delete_identity",
"tags": [],
"reasons": {}
},
{
"tool": "ses_send_email",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"send_email\""
]
}
},
{
"tool": "sns_list_topics",
"tags": [],
"reasons": {}
},
{
"tool": "sns_create_topic",
"tags": [],
"reasons": {}
},
{
"tool": "sns_delete_topic",
"tags": [],
"reasons": {}
},
{
"tool": "sns_subscribe",
"tags": [],
"reasons": {}
},
{
"tool": "sns_unsubscribe",
"tags": [],
"reasons": {}
},
{
"tool": "sns_list_subscriptions_by_topic",
"tags": [],
"reasons": {}
},
{
"tool": "sns_publish",
"tags": [],
"reasons": {}
},
{
"tool": "sqs_list_queues",
"tags": [],
"reasons": {}
},
{
"tool": "sqs_create_queue",
"tags": [],
"reasons": {}
},
{
"tool": "sqs_delete_queue",
"tags": [],
"reasons": {}
},
{
"tool": "sqs_send_message",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"send_message\""
]
}
},
{
"tool": "sqs_receive_messages",
"tags": [],
"reasons": {}
},
{
"tool": "sqs_delete_message",
"tags": [],
"reasons": {}
},
{
"tool": "sqs_purge_queue",
"tags": [],
"reasons": {}
},
{
"tool": "ssm_get_parameter",
"tags": [],
"reasons": {}
},
{
"tool": "ssm_put_parameter",
"tags": [],
"reasons": {}
},
{
"tool": "ssm_delete_parameter",
"tags": [],
"reasons": {}
},
{
"tool": "ssm_delete_parameters",
"tags": [],
"reasons": {}
},
{
"tool": "ssm_get_parameters_by_path",
"tags": [],
"reasons": {}
},
{
"tool": "ssm_describe_parameters",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "7f2d0d63afa01f456458775acc4cf9704aba75b58c19f8fde762994c5d4efa2d",
"stats": {
"tools": 73,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 1,
"high": 0,
"medium": 1,
"low": 1,
"info": 1
}
}
}