Peculium Wallet — the complete, unedited output of the deterministic mcptrustchecker engine v1.8.0, scanned . Every finding, capability tag and score component below is exactly what the engine produced — no AI, no post-processing.
{
"tool": {
"name": "mcptrustchecker",
"version": "1.8.0",
"methodologyVersion": "mcptrustchecker-1.8"
},
"target": {
"id": "@chainvue/peculium-wallet",
"source": {
"kind": "package",
"origin": "@chainvue/peculium-wallet"
},
"server": {
"name": "@chainvue/peculium-wallet"
}
},
"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-1.8"
},
"capability": {
"level": "high",
"reasons": [
"ingests untrusted external content (a prompt-injection entry point)",
"can send data / act on an external service",
"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": [
"external-sink",
"untrusted-input",
"sensitive-source"
]
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": true,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"Tools were statically extracted from the published source (11 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: wallet_paid_fetch → wallet_spending_report. 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": "wallet_paid_fetch → wallet_spending_report"
},
"owasp": "LLM02:2025 Sensitive Information Disclosure",
"references": [],
"data": {
"untrusted": [
"wallet_paid_fetch"
],
"sources": [
"wallet_paid_fetch"
],
"sinks": [
"wallet_spending_report"
],
"path": [
"wallet_paid_fetch",
"wallet_spending_report"
],
"edges": [
{
"from": "wallet_paid_fetch",
"to": "wallet_spending_report",
"kind": "agent-mediated"
}
],
"wired": false
}
},
{
"ruleId": "MTC-CAP-008",
"title": "Unconstrained path parameter \"path\" on \"wallet_paid_fetch\"",
"category": "permissions",
"severity": "low",
"confidence": "heuristic",
"description": "Tool \"wallet_paid_fetch\" takes a path parameter \"path\" with no constraint. Without a canonicalize-and-contain check (not visible statically), this permits ../ traversal outside the intended root.",
"remediation": "Resolve and verify the path stays within an allowed root; reject traversal sequences.",
"location": {
"kind": "tool",
"name": "wallet_paid_fetch",
"field": "inputSchema.properties.path"
},
"data": {
"param": "path"
}
}
],
"toxicFlows": [
{
"id": "flow-1",
"severity": "critical",
"confidence": "strong",
"untrustedInput": [
"wallet_paid_fetch"
],
"sensitiveSource": [
"wallet_paid_fetch"
],
"externalSink": [
"wallet_spending_report"
],
"selfContained": false,
"path": [
"wallet_paid_fetch",
"wallet_spending_report"
],
"pathWired": false,
"description": "A cross-tool exfiltration chain exists: wallet_paid_fetch → wallet_spending_report."
}
],
"capabilities": [
{
"tool": "wallet_balance",
"tags": [],
"reasons": {}
},
{
"tool": "wallet_receive_address",
"tags": [],
"reasons": {}
},
{
"tool": "wallet_list_recipients",
"tags": [],
"reasons": {}
},
{
"tool": "wallet_transaction_status",
"tags": [],
"reasons": {}
},
{
"tool": "wallet_spending_report",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"parameter \"recipient\""
]
}
},
{
"tool": "wallet_financial_position",
"tags": [],
"reasons": {}
},
{
"tool": "wallet_prepaid_balance",
"tags": [],
"reasons": {}
},
{
"tool": "wallet_precheck",
"tags": [],
"reasons": {}
},
{
"tool": "wallet_topup_facilitator",
"tags": [],
"reasons": {}
},
{
"tool": "wallet_send",
"tags": [],
"reasons": {}
},
{
"tool": "wallet_paid_fetch",
"tags": [
"untrusted-input",
"sensitive-source"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
],
"sensitive-source": [
"parameter \"path\""
]
}
}
],
"surfaceDigest": "5d77dcd9b33e71ebb98075be74371b0daa25b19de3bf39b2d2482559ff019994",
"stats": {
"tools": 11,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 1,
"high": 0,
"medium": 0,
"low": 1,
"info": 0
}
}
}