Smallest — 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": "@developer-smallestai/smallest-mcp-server",
"source": {
"kind": "package",
"origin": "@developer-smallestai/smallest-mcp-server"
},
"server": {
"name": "@developer-smallestai/smallest-mcp-server"
}
},
"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 (83 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 ([list_calls, get_webhooks]) co-exist with external-action tools ([add_agent_tool, update_agent, create_webhook, update_webhook, delete_webhook, attach_agent_webhook, detach_agent_webhooks]). 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": "list_calls → add_agent_tool"
},
"evidence": "untrusted [list_calls, get_webhooks] → sinks [add_agent_tool, update_agent, create_webhook, update_webhook, delete_webhook, attach_agent_webhook, detach_agent_w",
"owasp": "LLM06:2025 Excessive Agency",
"references": [],
"data": {
"untrusted": [
"list_calls",
"get_webhooks"
],
"sinks": [
"add_agent_tool",
"update_agent",
"create_webhook",
"update_webhook",
"delete_webhook",
"attach_agent_webhook",
"detach_agent_webhooks"
]
}
},
{
"ruleId": "MTC-CAP-007",
"title": "Unconstrained URL/host parameter \"url\" on \"add_agent_tool\"",
"category": "network",
"severity": "medium",
"confidence": "heuristic",
"description": "Tool \"add_agent_tool\" takes a URL/host parameter \"url\" with no allowlist/pattern. An outbound-request tool with an unbounded destination enables SSRF and cloud-metadata access (e.g. 169.254.169.254).",
"remediation": "Allowlist destinations or constrain the parameter; block private/link-local addresses server-side.",
"location": {
"kind": "tool",
"name": "add_agent_tool",
"field": "inputSchema.properties.url"
},
"owasp": "LLM06:2025 Excessive Agency",
"data": {
"param": "url"
}
}
],
"toxicFlows": [
{
"id": "flow-1",
"severity": "medium",
"confidence": "strong",
"untrustedInput": [
"list_calls",
"get_webhooks"
],
"sensitiveSource": [],
"externalSink": [
"add_agent_tool",
"update_agent",
"create_webhook",
"update_webhook",
"delete_webhook",
"attach_agent_webhook",
"detach_agent_webhooks"
],
"selfContained": false,
"description": "Untrusted input can drive an external action even though no sensitive source is exposed."
}
],
"capabilities": [
{
"tool": "add_agent_tool",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"http_request\""
]
}
},
{
"tool": "add_audience_members",
"tags": [],
"reasons": {}
},
{
"tool": "get_dashboard",
"tags": [],
"reasons": {}
},
{
"tool": "get_call_volume",
"tags": [],
"reasons": {}
},
{
"tool": "get_call_outcomes",
"tags": [],
"reasons": {}
},
{
"tool": "get_agent_performance",
"tags": [],
"reasons": {}
},
{
"tool": "get_hourly_performance",
"tags": [],
"reasons": {}
},
{
"tool": "get_pickup_rates",
"tags": [],
"reasons": {}
},
{
"tool": "get_phone_number_trends",
"tags": [],
"reasons": {}
},
{
"tool": "get_weekly_trends",
"tags": [],
"reasons": {}
},
{
"tool": "get_duration_stats",
"tags": [],
"reasons": {}
},
{
"tool": "get_attempt_cohorts",
"tags": [],
"reasons": {}
},
{
"tool": "get_call_counts_by_day",
"tags": [],
"reasons": {}
},
{
"tool": "get_credit_usage",
"tags": [],
"reasons": {}
},
{
"tool": "get_concurrency",
"tags": [],
"reasons": {}
},
{
"tool": "get_call_start_distribution",
"tags": [],
"reasons": {}
},
{
"tool": "get_daily_summary",
"tags": [],
"reasons": {}
},
{
"tool": "chat_with_agent",
"tags": [],
"reasons": {}
},
{
"tool": "configure_call_actions",
"tags": [],
"reasons": {}
},
{
"tool": "create_agent",
"tags": [],
"reasons": {}
},
{
"tool": "create_branch",
"tags": [],
"reasons": {}
},
{
"tool": "create_campaign",
"tags": [],
"reasons": {}
},
{
"tool": "debug_call",
"tags": [],
"reasons": {}
},
{
"tool": "delete_agent",
"tags": [],
"reasons": {}
},
{
"tool": "delete_audience_members",
"tags": [],
"reasons": {}
},
{
"tool": "delete_audience",
"tags": [],
"reasons": {}
},
{
"tool": "delete_branch",
"tags": [],
"reasons": {}
},
{
"tool": "delete_campaign",
"tags": [],
"reasons": {}
},
{
"tool": "diff",
"tags": [],
"reasons": {}
},
{
"tool": "duplicate_agent",
"tags": [],
"reasons": {}
},
{
"tool": "export_campaign_logs",
"tags": [],
"reasons": {}
},
{
"tool": "get_agent",
"tags": [],
"reasons": {}
},
{
"tool": "get_agent_prompt",
"tags": [],
"reasons": {}
},
{
"tool": "get_agents",
"tags": [],
"reasons": {}
},
{
"tool": "get_audience_members",
"tags": [],
"reasons": {}
},
{
"tool": "get_audience",
"tags": [],
"reasons": {}
},
{
"tool": "get_audiences",
"tags": [],
"reasons": {}
},
{
"tool": "get_auto_reload",
"tags": [],
"reasons": {}
},
{
"tool": "get_billing_alerts",
"tags": [],
"reasons": {}
},
{
"tool": "list_calls",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"browse\""
]
}
},
{
"tool": "get_branch_draft",
"tags": [],
"reasons": {}
},
{
"tool": "get_campaign",
"tags": [],
"reasons": {}
},
{
"tool": "get_campaigns",
"tags": [],
"reasons": {}
},
{
"tool": "get_credit_balance",
"tags": [],
"reasons": {}
},
{
"tool": "get_credit_ledger",
"tags": [],
"reasons": {}
},
{
"tool": "get_invoices",
"tags": [],
"reasons": {}
},
{
"tool": "get_payment_methods",
"tags": [],
"reasons": {}
},
{
"tool": "get_phone_numbers",
"tags": [],
"reasons": {}
},
{
"tool": "get_plans",
"tags": [],
"reasons": {}
},
{
"tool": "get_revision",
"tags": [],
"reasons": {}
},
{
"tool": "get_usage_breakdown",
"tags": [],
"reasons": {}
},
{
"tool": "get_usage_stats",
"tags": [],
"reasons": {}
},
{
"tool": "get_voices",
"tags": [],
"reasons": {}
},
{
"tool": "invite_member",
"tags": [],
"reasons": {}
},
{
"tool": "list_branches",
"tags": [],
"reasons": {}
},
{
"tool": "list_revisions",
"tags": [],
"reasons": {}
},
{
"tool": "make_branch_live",
"tags": [],
"reasons": {}
},
{
"tool": "make_call",
"tags": [],
"reasons": {}
},
{
"tool": "pause_campaign",
"tags": [],
"reasons": {}
},
{
"tool": "get_playbooks",
"tags": [],
"reasons": {}
},
{
"tool": "add_playbooks",
"tags": [],
"reasons": {}
},
{
"tool": "update_playbook",
"tags": [],
"reasons": {}
},
{
"tool": "configure_playbooks",
"tags": [],
"reasons": {}
},
{
"tool": "publish_draft",
"tags": [],
"reasons": {}
},
{
"tool": "redeem_coupon",
"tags": [],
"reasons": {}
},
{
"tool": "remove_agent_tool",
"tags": [],
"reasons": {}
},
{
"tool": "rename_branch",
"tags": [],
"reasons": {}
},
{
"tool": "search_audience_members",
"tags": [],
"reasons": {}
},
{
"tool": "start_campaign",
"tags": [],
"reasons": {}
},
{
"tool": "test_agent",
"tags": [],
"reasons": {}
},
{
"tool": "text_to_speech",
"tags": [],
"reasons": {}
},
{
"tool": "transcribe_audio",
"tags": [],
"reasons": {}
},
{
"tool": "update_agent",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"call_api\""
]
}
},
{
"tool": "update_billing_alerts",
"tags": [],
"reasons": {}
},
{
"tool": "validate_coupon",
"tags": [],
"reasons": {}
},
{
"tool": "create_webhook",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"webhook\""
]
}
},
{
"tool": "get_webhooks",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "update_webhook",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"webhook\"",
"parameter \"webhook\""
]
}
},
{
"tool": "delete_webhook",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"webhook\"",
"parameter \"webhook\""
]
}
},
{
"tool": "get_webhook_events",
"tags": [],
"reasons": {}
},
{
"tool": "attach_agent_webhook",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"webhook\"",
"parameter \"webhook\""
]
}
},
{
"tool": "get_agent_webhooks",
"tags": [],
"reasons": {}
},
{
"tool": "detach_agent_webhooks",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"webhook\""
]
}
}
],
"surfaceDigest": "1130c7713dda343441d0dff2d8213e8b0920786663259e4bd0c791accd532f73",
"stats": {
"tools": 83,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 0,
"medium": 2,
"low": 0,
"info": 0
}
}
}