Arc — 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": "arc-mcp",
"source": {
"kind": "package",
"origin": "arc-mcp"
},
"server": {
"name": "arc-mcp"
}
},
"grade": "B",
"score": {
"score": 82,
"threatScore": 94,
"grade": "B",
"band": "B",
"categorySubtotals": {
"injection": 6.3,
"exfiltration": 0,
"permissions": 0,
"supply-chain": 0,
"network": 0,
"hygiene": 0
},
"vector": [
{
"kind": "threat",
"ruleId": "MTC-SRC-009",
"category": "injection",
"severity": "medium",
"confidence": "strong",
"rawWeight": 9,
"confidenceMult": 0.7,
"diminishingFactor": 1,
"appliedPenalty": 6.3
},
{
"kind": "client",
"term": "capability-exposure",
"level": "critical",
"label": "capability blast radius (critical) — client exposure if the model is manipulated",
"appliedPenalty": 10
},
{
"kind": "client",
"term": "verification-discount",
"level": "none",
"label": "publisher verification (unlinked) — no provenance/repo link, but the shipped source was fully read",
"appliedPenalty": 2
},
{
"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": "critical",
"reasons": [
"ingests untrusted external content (a prompt-injection entry point)",
"can execute shell commands or code",
"untrusted input can reach code execution"
],
"tags": [
"untrusted-input",
"code-exec"
]
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": true,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"Tools were statically extracted from the published source (35 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-SRC-002",
"title": "Shell/command execution in server code (dist/db.js)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`dist/db.js:1`): 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/db.js"
},
"evidence": "{ execSync } from \"node:child_process\"; import fs from \"node:fs\"; import os from \"node:os\"; import path from \"node:path\"",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "dist/db.js",
"line": 1,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (dist/index.js)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`dist/index.js:2`): 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/index.js"
},
"evidence": "{ execSync } from \"node:child_process\"; import fs from \"node:fs/promises\"; import path from \"node:path\"; import { setTim",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "dist/index.js",
"line": 2,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-009",
"title": "Untrusted input concatenated into a command sink (dist/db.js)",
"category": "injection",
"severity": "medium",
"confidence": "strong",
"description": "In the server's implementation (`dist/db.js:160`): A shell/process command assembled from concatenated or interpolated values is command injection when any part is attacker-influenced — the OWASP canonical RCE flow. Verify what reaches the interpolated value. 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/db.js"
},
"evidence": "const author = execSync(`git log -1 --format=%an ${ref}`, { cwd: gitRoot, encoding: \"utf8\",",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-009",
"file": "dist/db.js",
"line": 160,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SUP-012",
"title": "Package has no license",
"category": "hygiene",
"severity": "info",
"confidence": "strong",
"description": "\"arc-mcp\" has no declared license. This is a legal/reuse concern, not a security finding.",
"location": {
"kind": "package",
"name": "arc-mcp"
}
},
{
"ruleId": "MTC-SUP-011",
"title": "Package declares no source repository",
"category": "supply-chain",
"severity": "info",
"confidence": "strong",
"description": "\"arc-mcp\" declares no repository URL, so its published artifact cannot be compared against reviewable source.",
"remediation": "Prefer packages that link to public, reviewable source.",
"location": {
"kind": "package",
"name": "arc-mcp"
}
}
],
"toxicFlows": [],
"capabilities": [
{
"tool": "ingest_evidence",
"tags": [],
"reasons": {}
},
{
"tool": "annotate_evidence",
"tags": [],
"reasons": {}
},
{
"tool": "delete_evidence",
"tags": [],
"reasons": {}
},
{
"tool": "link_evidence_to_work_item",
"tags": [],
"reasons": {}
},
{
"tool": "update_evidence",
"tags": [],
"reasons": {}
},
{
"tool": "create_work_item",
"tags": [],
"reasons": {}
},
{
"tool": "update_work_item",
"tags": [],
"reasons": {}
},
{
"tool": "project_work_item",
"tags": [],
"reasons": {}
},
{
"tool": "update_projection_status",
"tags": [],
"reasons": {}
},
{
"tool": "generate_weekly_summary",
"tags": [],
"reasons": {}
},
{
"tool": "generate_executive_update",
"tags": [],
"reasons": {}
},
{
"tool": "generate_risk_brief",
"tags": [],
"reasons": {}
},
{
"tool": "generate_release_brief",
"tags": [],
"reasons": {}
},
{
"tool": "explain_delivery_latency",
"tags": [],
"reasons": {}
},
{
"tool": "get_pipeline_state",
"tags": [],
"reasons": {}
},
{
"tool": "list_projects",
"tags": [],
"reasons": {}
},
{
"tool": "list_work_items",
"tags": [],
"reasons": {}
},
{
"tool": "list_unlinked_evidences",
"tags": [],
"reasons": {}
},
{
"tool": "scan_workspace",
"tags": [],
"reasons": {}
},
{
"tool": "register_notion_db",
"tags": [],
"reasons": {}
},
{
"tool": "update_workspace_context",
"tags": [],
"reasons": {}
},
{
"tool": "read_project_docs",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"read_pr\""
]
}
},
{
"tool": "update_project_docs",
"tags": [],
"reasons": {}
},
{
"tool": "delete_project_docs_section",
"tags": [],
"reasons": {}
},
{
"tool": "get_work_item",
"tags": [],
"reasons": {}
},
{
"tool": "add_test_case",
"tags": [],
"reasons": {}
},
{
"tool": "delete_test_case",
"tags": [],
"reasons": {}
},
{
"tool": "mark_test_case",
"tags": [],
"reasons": {}
},
{
"tool": "list_qa_pending",
"tags": [],
"reasons": {}
},
{
"tool": "list_qa_rejections",
"tags": [],
"reasons": {}
},
{
"tool": "reset_qa",
"tags": [],
"reasons": {}
},
{
"tool": "plan_exact_design_extraction",
"tags": [],
"reasons": {}
},
{
"tool": "extract_exact_design_document",
"tags": [],
"reasons": {}
},
{
"tool": "check_penpot_token_backend",
"tags": [],
"reasons": {}
},
{
"tool": "capture_page_to_figma",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "2d490172fbc548d37a69ce6fae614650d05483e6354b89e3ab0e756cef4eb979",
"stats": {
"tools": 35,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 2,
"medium": 1,
"low": 0,
"info": 2
}
}
}