Karbon — 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": "karbon-mcp-server",
"source": {
"kind": "package",
"origin": "karbon-mcp-server"
},
"server": {
"name": "karbon-mcp-server"
}
},
"grade": "A",
"score": {
"score": 97,
"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": "source",
"label": "publisher verification (provenance) — cryptographic build provenance ties the artifact to its source",
"appliedPenalty": 0
},
{
"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": [
"untrusted-input",
"external-sink"
]
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": true,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"Tools were statically extracted from the published source (53 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 ([update_business_card, list_entity_files, download_file]) co-exist with external-action tools ([upload_file]). 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": "update_business_card → upload_file"
},
"evidence": "untrusted [update_business_card, list_entity_files, download_file] → sinks [upload_file]",
"owasp": "LLM06:2025 Excessive Agency",
"references": [],
"data": {
"untrusted": [
"update_business_card",
"list_entity_files",
"download_file"
],
"sinks": [
"upload_file"
]
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in packaging/dev tooling (dist/setup.js)",
"category": "permissions",
"severity": "low",
"confidence": "heuristic",
"description": "In a packaging/dev/install script (shipped, but not the server runtime) (`dist/setup.js:14`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "dist/setup.js"
},
"evidence": "spawnSync } from \"node:child_process\"; import * as fs from \"node:fs\"; import * as os from \"node:os\"; import * as path f",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "dist/setup.js",
"line": 14,
"nonRuntime": true
}
}
],
"toxicFlows": [
{
"id": "flow-1",
"severity": "medium",
"confidence": "strong",
"untrustedInput": [
"update_business_card",
"list_entity_files",
"download_file"
],
"sensitiveSource": [],
"externalSink": [
"upload_file"
],
"selfContained": false,
"description": "Untrusted input can drive an external action even though no sensitive source is exposed."
}
],
"capabilities": [
{
"tool": "get_business_card",
"tags": [],
"reasons": {}
},
{
"tool": "update_business_card",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "list_client_groups",
"tags": [],
"reasons": {}
},
{
"tool": "get_client_group",
"tags": [],
"reasons": {}
},
{
"tool": "create_client_group",
"tags": [],
"reasons": {}
},
{
"tool": "update_client_group",
"tags": [],
"reasons": {}
},
{
"tool": "list_contacts",
"tags": [],
"reasons": {}
},
{
"tool": "get_contact",
"tags": [],
"reasons": {}
},
{
"tool": "create_contact",
"tags": [],
"reasons": {}
},
{
"tool": "update_contact",
"tags": [],
"reasons": {}
},
{
"tool": "list_custom_fields",
"tags": [],
"reasons": {}
},
{
"tool": "get_custom_field_values",
"tags": [],
"reasons": {}
},
{
"tool": "set_custom_field_values",
"tags": [],
"reasons": {}
},
{
"tool": "create_custom_field",
"tags": [],
"reasons": {}
},
{
"tool": "delete_custom_field",
"tags": [],
"reasons": {}
},
{
"tool": "list_entity_files",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"download\""
]
}
},
{
"tool": "download_file",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"download\""
]
}
},
{
"tool": "upload_file",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"upload_file\""
]
}
},
{
"tool": "list_invoices",
"tags": [],
"reasons": {}
},
{
"tool": "get_invoice",
"tags": [],
"reasons": {}
},
{
"tool": "get_note",
"tags": [],
"reasons": {}
},
{
"tool": "get_comment",
"tags": [],
"reasons": {}
},
{
"tool": "create_note",
"tags": [],
"reasons": {}
},
{
"tool": "list_organizations",
"tags": [],
"reasons": {}
},
{
"tool": "get_organization",
"tags": [],
"reasons": {}
},
{
"tool": "create_organization",
"tags": [],
"reasons": {}
},
{
"tool": "update_organization",
"tags": [],
"reasons": {}
},
{
"tool": "list_payments",
"tags": [],
"reasons": {}
},
{
"tool": "get_payment",
"tags": [],
"reasons": {}
},
{
"tool": "create_manual_payment",
"tags": [],
"reasons": {}
},
{
"tool": "delete_manual_payment",
"tags": [],
"reasons": {}
},
{
"tool": "reverse_manual_payment",
"tags": [],
"reasons": {}
},
{
"tool": "list_teams",
"tags": [],
"reasons": {}
},
{
"tool": "get_team",
"tags": [],
"reasons": {}
},
{
"tool": "add_team_members",
"tags": [],
"reasons": {}
},
{
"tool": "remove_team_member",
"tags": [],
"reasons": {}
},
{
"tool": "get_tenant_settings",
"tags": [],
"reasons": {}
},
{
"tool": "list_work_templates",
"tags": [],
"reasons": {}
},
{
"tool": "get_work_template",
"tags": [],
"reasons": {}
},
{
"tool": "list_timesheets",
"tags": [],
"reasons": {}
},
{
"tool": "get_timesheet",
"tags": [],
"reasons": {}
},
{
"tool": "list_time_entries",
"tags": [],
"reasons": {}
},
{
"tool": "get_time_entry",
"tags": [],
"reasons": {}
},
{
"tool": "list_users",
"tags": [],
"reasons": {}
},
{
"tool": "get_user",
"tags": [],
"reasons": {}
},
{
"tool": "list_work_items",
"tags": [],
"reasons": {}
},
{
"tool": "get_work_item",
"tags": [],
"reasons": {}
},
{
"tool": "get_estimate_summary",
"tags": [],
"reasons": {}
},
{
"tool": "create_work_item",
"tags": [],
"reasons": {}
},
{
"tool": "update_work_item",
"tags": [],
"reasons": {}
},
{
"tool": "get_work_schedule",
"tags": [],
"reasons": {}
},
{
"tool": "create_work_schedule",
"tags": [],
"reasons": {}
},
{
"tool": "update_work_schedule",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "ff57f6651b4b59f8c6f67591e3fdbee223399b241af3090e2da512827b72f141",
"stats": {
"tools": 53,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 0,
"medium": 1,
"low": 1,
"info": 0
}
}
}