Pepesto — 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": "@pepesto/pepesto-mcp",
"source": {
"kind": "package",
"origin": "@pepesto/pepesto-mcp"
},
"server": {
"name": "@pepesto/pepesto-mcp"
}
},
"grade": "A",
"score": {
"score": 94,
"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": "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": "high",
"reasons": [
"can send data / act on an external service",
"reads sensitive or local data",
"has a read → egress path (a data-exfiltration surface)"
],
"tags": [
"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 (7 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-003",
"title": "Read-and-egress in one tool: \"pepesto_catalog\"",
"category": "exfiltration",
"severity": "high",
"confidence": "strong",
"description": "Tool \"pepesto_catalog\" can both read sensitive data and send data to an external destination. Even without an explicit untrusted-input leg, this is a single-call data-exfiltration path if the model is ever manipulated.",
"remediation": "Separate reading from sending; require explicit user confirmation before egress of file/secret contents.",
"location": {
"kind": "flow",
"name": "pepesto_catalog"
},
"owasp": "LLM02:2025 Sensitive Information Disclosure",
"references": [],
"data": {
"tags": [
"sensitive-source",
"external-sink"
]
}
},
{
"ruleId": "MTC-CAP-007",
"title": "Unconstrained URL/host parameter \"webhook_url\" on \"pepesto_catalog\"",
"category": "network",
"severity": "medium",
"confidence": "heuristic",
"description": "Tool \"pepesto_catalog\" takes a URL/host parameter \"webhook_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": "pepesto_catalog",
"field": "inputSchema.properties.webhook_url"
},
"owasp": "LLM06:2025 Excessive Agency",
"data": {
"param": "webhook_url"
}
}
],
"toxicFlows": [
{
"id": "flow-1",
"severity": "high",
"confidence": "strong",
"untrustedInput": [],
"sensitiveSource": [
"pepesto_catalog"
],
"externalSink": [
"pepesto_catalog"
],
"selfContained": true,
"description": "Tool \"pepesto_catalog\" both reads sensitive data and can send it externally."
}
],
"capabilities": [
{
"tool": "pepesto_catalog",
"tags": [
"sensitive-source",
"external-sink"
],
"reasons": {
"sensitive-source": [
"keyword \"dump\""
],
"external-sink": [
"parameter \"webhook\""
]
}
},
{
"tool": "pepesto_credits",
"tags": [],
"reasons": {}
},
{
"tool": "pepesto_oneshot",
"tags": [],
"reasons": {}
},
{
"tool": "pepesto_parse",
"tags": [],
"reasons": {}
},
{
"tool": "pepesto_predirect",
"tags": [],
"reasons": {}
},
{
"tool": "pepesto_products",
"tags": [],
"reasons": {}
},
{
"tool": "pepesto_suggest",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "9c1a781c71afdc12e41bdac90cd2b8ea0bee50fe034d7fd840d12b85bb666d32",
"stats": {
"tools": 7,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 1,
"medium": 1,
"low": 0,
"info": 0
}
}
}