Chrome Dev — 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": "chrome-dev-mcp",
"source": {
"kind": "package",
"origin": "chrome-dev-mcp"
},
"server": {
"name": "chrome-dev-mcp"
}
},
"grade": "B",
"score": {
"score": 84,
"threatScore": 85,
"grade": "B",
"band": "B",
"categorySubtotals": {
"injection": 15.4,
"exfiltration": 0,
"permissions": 0,
"supply-chain": 0,
"network": 0,
"hygiene": 0
},
"vector": [
{
"kind": "threat",
"ruleId": "MTC-INJ-SECRECY-1",
"category": "injection",
"severity": "high",
"confidence": "strong",
"rawWeight": 22,
"confidenceMult": 0.7,
"diminishingFactor": 1,
"appliedPenalty": 15.4
},
{
"kind": "client",
"term": "capability-exposure",
"level": "minimal",
"label": "capability blast radius (minimal) — client exposure if the model is manipulated",
"appliedPenalty": 0
},
{
"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": "minimal",
"reasons": [],
"tags": []
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": true,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"Tools were statically extracted from the published source (21 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-INJ-SECRECY-1",
"title": "Secrecy directive (conceal action from the user)",
"category": "injection",
"severity": "high",
"confidence": "strong",
"description": "Secrecy directive (conceal action from the user) detected in the description of tool \"list_tabs\". Instruction-like content in tool metadata is executed by the model, not the human, and is the primary tool-poisoning vector.",
"remediation": "Tool descriptions should describe behavior, not instruct the assistant. Treat imperative / secrecy / sequencing language in metadata as hostile.",
"location": {
"kind": "tool",
"name": "list_tabs",
"field": "description"
},
"evidence": "do NOT tell the user",
"owasp": "LLM01:2025 Prompt Injection",
"data": {
"kind": "secrecy"
}
}
],
"toxicFlows": [],
"capabilities": [
{
"tool": "list_tabs",
"tags": [],
"reasons": {}
},
{
"tool": "switch_tab",
"tags": [],
"reasons": {}
},
{
"tool": "get_title",
"tags": [],
"reasons": {}
},
{
"tool": "get_url",
"tags": [],
"reasons": {}
},
{
"tool": "get_html",
"tags": [],
"reasons": {}
},
{
"tool": "evaluate_js",
"tags": [],
"reasons": {}
},
{
"tool": "get_computed_style",
"tags": [],
"reasons": {}
},
{
"tool": "screenshot",
"tags": [],
"reasons": {}
},
{
"tool": "get_inspected_element",
"tags": [],
"reasons": {}
},
{
"tool": "get_debugger_state",
"tags": [],
"reasons": {}
},
{
"tool": "get_scope_variables",
"tags": [],
"reasons": {}
},
{
"tool": "set_breakpoint",
"tags": [],
"reasons": {}
},
{
"tool": "remove_breakpoint",
"tags": [],
"reasons": {}
},
{
"tool": "list_breakpoints",
"tags": [],
"reasons": {}
},
{
"tool": "pause_execution",
"tags": [],
"reasons": {}
},
{
"tool": "resume_execution",
"tags": [],
"reasons": {}
},
{
"tool": "step_over",
"tags": [],
"reasons": {}
},
{
"tool": "step_into",
"tags": [],
"reasons": {}
},
{
"tool": "evaluate_at_frame",
"tags": [],
"reasons": {}
},
{
"tool": "step_out",
"tags": [],
"reasons": {}
},
{
"tool": "get_console_logs",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "a6ad790514a99d082d4f9facd7945cf69e2480472328737581a5d7a4d0ffadf0",
"stats": {
"tools": 21,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 1,
"medium": 0,
"low": 0,
"info": 0
}
}
}