Stealth Chrome — 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": "mcp-stealth-chrome",
"source": {
"kind": "package",
"origin": "mcp-stealth-chrome"
},
"server": {
"name": "mcp-stealth-chrome"
}
},
"grade": "A",
"score": {
"score": 93,
"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": "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": "high",
"reasons": [
"ingests untrusted external content (a prompt-injection entry point)",
"can send data / act on an external service",
"can execute shell commands or code"
],
"tags": [
"external-sink",
"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 (160 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-CAP-001",
"title": "Tool \"spawn_browser\" exposes command/code execution",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "Tool \"spawn_browser\" appears to run shell commands or evaluate code (keyword \"spawn\" in tool name). Arbitrary execution driven by model input is one of the most dangerous MCP capabilities; combined with any untrusted input it becomes RCE.",
"remediation": "Sandbox execution, allowlist commands/arguments, and never pass model output to a shell unescaped.",
"location": {
"kind": "tool",
"name": "spawn_browser"
},
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"tags": [
"code-exec"
]
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (src/mcp_stealth_chrome/server.py)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`src/mcp_stealth_chrome/server.py:1613`): 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": "src/mcp_stealth_chrome/server.py"
},
"evidence": "completed = subprocess.run( [\"open\", \"-a\", str(app)], capture_output",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "src/mcp_stealth_chrome/server.py",
"line": 1613,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (src/mcp_stealth_chrome/state.py)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`src/mcp_stealth_chrome/state.py:194`): 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": "src/mcp_stealth_chrome/state.py"
},
"evidence": "process r = subprocess.run( [\"tasklist\", \"/FI\", f\"PID eq {pid}\", \"/NH\", \"/FO\", \"CSV\"],",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "src/mcp_stealth_chrome/state.py",
"line": 194,
"nonRuntime": false
}
},
{
"ruleId": "MTC-FLOW-005",
"title": "Untrusted input can drive an external action",
"category": "exfiltration",
"severity": "medium",
"confidence": "strong",
"description": "Untrusted-input tools ([network_start, get_page_errors, scrape_page, wait_for_network_idle, web_search, scrape_markdown, smart_fetch]) co-exist with external-action tools ([upload_file, export_curl, spawn_browser, http_request_with_session, http_request]). 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": "network_start → upload_file"
},
"evidence": "untrusted [network_start, get_page_errors, scrape_page, wait_for_network_idle, web_search, scrape_markdown, smart_fetch] → sinks [upload_file, export_curl, spaw",
"owasp": "LLM06:2025 Excessive Agency",
"references": [],
"data": {
"untrusted": [
"network_start",
"get_page_errors",
"scrape_page",
"wait_for_network_idle",
"web_search",
"scrape_markdown",
"smart_fetch"
],
"sinks": [
"upload_file",
"export_curl",
"spawn_browser",
"http_request_with_session",
"http_request"
]
}
},
{
"ruleId": "MTC-CAP-005",
"title": "Mutating tool \"spawn_browser\" declares no destructiveHint",
"category": "hygiene",
"severity": "low",
"confidence": "heuristic",
"description": "Tool \"spawn_browser\" can mutate/egress but declares no destructiveHint. Clients that don't default to spec-safe behavior may not prompt before running it.",
"remediation": "Declare accurate annotations, and gate destructive tools on user confirmation regardless.",
"location": {
"kind": "tool",
"name": "spawn_browser"
},
"data": {
"tags": [
"code-exec"
]
}
}
],
"toxicFlows": [
{
"id": "flow-1",
"severity": "medium",
"confidence": "strong",
"untrustedInput": [
"network_start",
"get_page_errors",
"scrape_page",
"wait_for_network_idle",
"web_search",
"scrape_markdown",
"smart_fetch"
],
"sensitiveSource": [],
"externalSink": [
"upload_file",
"export_curl",
"spawn_browser",
"http_request_with_session",
"http_request"
],
"selfContained": false,
"description": "Untrusted input can drive an external action even though no sensitive source is exposed."
}
],
"capabilities": [
{
"tool": "browser_launch",
"tags": [],
"reasons": {}
},
{
"tool": "browser_close",
"tags": [],
"reasons": {}
},
{
"tool": "browser_recover",
"tags": [],
"reasons": {}
},
{
"tool": "navigate",
"tags": [],
"reasons": {}
},
{
"tool": "tab_focus",
"tags": [],
"reasons": {}
},
{
"tool": "request_human_help",
"tags": [],
"reasons": {}
},
{
"tool": "wait_for_human",
"tags": [],
"reasons": {}
},
{
"tool": "go_back",
"tags": [],
"reasons": {}
},
{
"tool": "go_forward",
"tags": [],
"reasons": {}
},
{
"tool": "reload",
"tags": [],
"reasons": {}
},
{
"tool": "browser_snapshot",
"tags": [],
"reasons": {}
},
{
"tool": "screenshot",
"tags": [],
"reasons": {}
},
{
"tool": "get_text",
"tags": [],
"reasons": {}
},
{
"tool": "get_html",
"tags": [],
"reasons": {}
},
{
"tool": "get_url",
"tags": [],
"reasons": {}
},
{
"tool": "save_pdf",
"tags": [],
"reasons": {}
},
{
"tool": "click",
"tags": [],
"reasons": {}
},
{
"tool": "click_text",
"tags": [],
"reasons": {}
},
{
"tool": "click_role",
"tags": [],
"reasons": {}
},
{
"tool": "assert_clickable",
"tags": [],
"reasons": {}
},
{
"tool": "hover",
"tags": [],
"reasons": {}
},
{
"tool": "fill",
"tags": [],
"reasons": {}
},
{
"tool": "type_text",
"tags": [],
"reasons": {}
},
{
"tool": "press_key",
"tags": [],
"reasons": {}
},
{
"tool": "select_option",
"tags": [],
"reasons": {}
},
{
"tool": "check",
"tags": [],
"reasons": {}
},
{
"tool": "uncheck",
"tags": [],
"reasons": {}
},
{
"tool": "upload_file",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"upload_file\""
]
}
},
{
"tool": "mouse_click_xy",
"tags": [],
"reasons": {}
},
{
"tool": "mouse_move",
"tags": [],
"reasons": {}
},
{
"tool": "drag_and_drop",
"tags": [],
"reasons": {}
},
{
"tool": "wait_for",
"tags": [],
"reasons": {}
},
{
"tool": "wait_for_change",
"tags": [],
"reasons": {}
},
{
"tool": "wait_for_navigation",
"tags": [],
"reasons": {}
},
{
"tool": "wait_for_url",
"tags": [],
"reasons": {}
},
{
"tool": "wait_for_response",
"tags": [],
"reasons": {}
},
{
"tool": "tab_list",
"tags": [],
"reasons": {}
},
{
"tool": "tab_new",
"tags": [],
"reasons": {}
},
{
"tool": "tab_select",
"tags": [],
"reasons": {}
},
{
"tool": "tab_close",
"tags": [],
"reasons": {}
},
{
"tool": "cookie_list",
"tags": [],
"reasons": {}
},
{
"tool": "cookie_set",
"tags": [],
"reasons": {}
},
{
"tool": "cookie_delete",
"tags": [],
"reasons": {}
},
{
"tool": "cookie_import",
"tags": [],
"reasons": {}
},
{
"tool": "cookie_export",
"tags": [],
"reasons": {}
},
{
"tool": "localstorage_get",
"tags": [],
"reasons": {}
},
{
"tool": "localstorage_set",
"tags": [],
"reasons": {}
},
{
"tool": "localstorage_clear",
"tags": [],
"reasons": {}
},
{
"tool": "sessionstorage_get",
"tags": [],
"reasons": {}
},
{
"tool": "sessionstorage_set",
"tags": [],
"reasons": {}
},
{
"tool": "sessionstorage_clear",
"tags": [],
"reasons": {}
},
{
"tool": "cache_clear",
"tags": [],
"reasons": {}
},
{
"tool": "indexeddb_list",
"tags": [],
"reasons": {}
},
{
"tool": "indexeddb_delete",
"tags": [],
"reasons": {}
},
{
"tool": "evaluate",
"tags": [],
"reasons": {}
},
{
"tool": "inject_init_script",
"tags": [],
"reasons": {}
},
{
"tool": "inspect_element",
"tags": [],
"reasons": {}
},
{
"tool": "get_attribute",
"tags": [],
"reasons": {}
},
{
"tool": "query_selector_all",
"tags": [],
"reasons": {}
},
{
"tool": "get_links",
"tags": [],
"reasons": {}
},
{
"tool": "list_frames",
"tags": [],
"reasons": {}
},
{
"tool": "frame_evaluate",
"tags": [],
"reasons": {}
},
{
"tool": "batch_actions",
"tags": [],
"reasons": {}
},
{
"tool": "fill_form",
"tags": [],
"reasons": {}
},
{
"tool": "navigate_and_snapshot",
"tags": [],
"reasons": {}
},
{
"tool": "get_viewport_size",
"tags": [],
"reasons": {}
},
{
"tool": "set_viewport_size",
"tags": [],
"reasons": {}
},
{
"tool": "scroll",
"tags": [],
"reasons": {}
},
{
"tool": "scroll_to",
"tags": [],
"reasons": {}
},
{
"tool": "dialog_handle",
"tags": [],
"reasons": {}
},
{
"tool": "dialog_auto_handle",
"tags": [],
"reasons": {}
},
{
"tool": "accessibility_snapshot",
"tags": [],
"reasons": {}
},
{
"tool": "console_start",
"tags": [],
"reasons": {}
},
{
"tool": "console_get",
"tags": [],
"reasons": {}
},
{
"tool": "network_start",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "network_get",
"tags": [],
"reasons": {}
},
{
"tool": "server_status",
"tags": [],
"reasons": {}
},
{
"tool": "get_page_errors",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"get_page\""
]
}
},
{
"tool": "fingerprint_audit",
"tags": [],
"reasons": {}
},
{
"tool": "export_curl",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"curl\""
]
}
},
{
"tool": "intercept_start",
"tags": [],
"reasons": {}
},
{
"tool": "intercept_log",
"tags": [],
"reasons": {}
},
{
"tool": "intercept_stop",
"tags": [],
"reasons": {}
},
{
"tool": "dry_run",
"tags": [],
"reasons": {}
},
{
"tool": "export_har",
"tags": [],
"reasons": {}
},
{
"tool": "detect_content_pattern",
"tags": [],
"reasons": {}
},
{
"tool": "extract_structured",
"tags": [],
"reasons": {}
},
{
"tool": "extract_table",
"tags": [],
"reasons": {}
},
{
"tool": "scrape_page",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"scrape\""
]
}
},
{
"tool": "storage_state_save",
"tags": [],
"reasons": {}
},
{
"tool": "storage_state_load",
"tags": [],
"reasons": {}
},
{
"tool": "solve_captcha",
"tags": [],
"reasons": {}
},
{
"tool": "verify_cf",
"tags": [],
"reasons": {}
},
{
"tool": "identity_pin",
"tags": [],
"reasons": {}
},
{
"tool": "identity_show",
"tags": [],
"reasons": {}
},
{
"tool": "fingerprint_rotate",
"tags": [],
"reasons": {}
},
{
"tool": "humanize_click",
"tags": [],
"reasons": {}
},
{
"tool": "humanize_type",
"tags": [],
"reasons": {}
},
{
"tool": "click_turnstile",
"tags": [],
"reasons": {}
},
{
"tool": "click_element_offset",
"tags": [],
"reasons": {}
},
{
"tool": "click_at_corner",
"tags": [],
"reasons": {}
},
{
"tool": "find_by_image",
"tags": [],
"reasons": {}
},
{
"tool": "click_at_image",
"tags": [],
"reasons": {}
},
{
"tool": "mouse_drift",
"tags": [],
"reasons": {}
},
{
"tool": "mouse_record",
"tags": [],
"reasons": {}
},
{
"tool": "mouse_replay",
"tags": [],
"reasons": {}
},
{
"tool": "spawn_browser",
"tags": [
"code-exec"
],
"reasons": {
"code-exec": [
"keyword \"spawn\" in tool name"
]
}
},
{
"tool": "list_instances",
"tags": [],
"reasons": {}
},
{
"tool": "instance_describe",
"tags": [],
"reasons": {}
},
{
"tool": "switch_instance",
"tags": [],
"reasons": {}
},
{
"tool": "close_instance",
"tags": [],
"reasons": {}
},
{
"tool": "close_all_instances",
"tags": [],
"reasons": {}
},
{
"tool": "list_chrome_profiles",
"tags": [],
"reasons": {}
},
{
"tool": "clone_chrome_profile",
"tags": [],
"reasons": {}
},
{
"tool": "describe_page",
"tags": [],
"reasons": {}
},
{
"tool": "smart_fill",
"tags": [],
"reasons": {}
},
{
"tool": "assert_text_present",
"tags": [],
"reasons": {}
},
{
"tool": "assert_url_matches",
"tags": [],
"reasons": {}
},
{
"tool": "assert_element_visible",
"tags": [],
"reasons": {}
},
{
"tool": "storage_snapshot",
"tags": [],
"reasons": {}
},
{
"tool": "storage_diff",
"tags": [],
"reasons": {}
},
{
"tool": "workflow_run",
"tags": [],
"reasons": {}
},
{
"tool": "detect_and_bypass",
"tags": [],
"reasons": {}
},
{
"tool": "paste_text",
"tags": [],
"reasons": {}
},
{
"tool": "auth_capture",
"tags": [],
"reasons": {}
},
{
"tool": "http_request_with_session",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"http_request\""
]
}
},
{
"tool": "wait_for_request",
"tags": [],
"reasons": {}
},
{
"tool": "click_and_wait",
"tags": [],
"reasons": {}
},
{
"tool": "form_introspect",
"tags": [],
"reasons": {}
},
{
"tool": "list_external_chrome",
"tags": [],
"reasons": {}
},
{
"tool": "attach_to_chrome",
"tags": [],
"reasons": {}
},
{
"tool": "detach",
"tags": [],
"reasons": {}
},
{
"tool": "performance_trace_start",
"tags": [],
"reasons": {}
},
{
"tool": "performance_trace_stop",
"tags": [],
"reasons": {}
},
{
"tool": "performance_metrics",
"tags": [],
"reasons": {}
},
{
"tool": "performance_timeline",
"tags": [],
"reasons": {}
},
{
"tool": "web_vitals",
"tags": [],
"reasons": {}
},
{
"tool": "emulate_network",
"tags": [],
"reasons": {}
},
{
"tool": "emulate_cpu",
"tags": [],
"reasons": {}
},
{
"tool": "emulate_device",
"tags": [],
"reasons": {}
},
{
"tool": "coverage_start",
"tags": [],
"reasons": {}
},
{
"tool": "coverage_stop",
"tags": [],
"reasons": {}
},
{
"tool": "memory_heap_snapshot",
"tags": [],
"reasons": {}
},
{
"tool": "wait_for_network_idle",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "console_clear",
"tags": [],
"reasons": {}
},
{
"tool": "http_request",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"http_request\""
]
}
},
{
"tool": "http_session_cookies",
"tags": [],
"reasons": {}
},
{
"tool": "session_warmup",
"tags": [],
"reasons": {}
},
{
"tool": "detect_anti_bot",
"tags": [],
"reasons": {}
},
{
"tool": "web_search",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"web_search\""
]
}
},
{
"tool": "scrape_markdown",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"scrape\""
]
}
},
{
"tool": "smart_fetch",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "deep_research",
"tags": [],
"reasons": {}
},
{
"tool": "search_page",
"tags": [],
"reasons": {}
},
{
"tool": "social_digest",
"tags": [],
"reasons": {}
},
{
"tool": "github_read",
"tags": [],
"reasons": {}
},
{
"tool": "youtube_read",
"tags": [],
"reasons": {}
},
{
"tool": "social_research",
"tags": [],
"reasons": {}
},
{
"tool": "solve_recaptcha_ai",
"tags": [],
"reasons": {}
},
{
"tool": "vision_locate",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "6d972527ab33417eedce938428a7eb5d3ffc9bc22a5486858991dad7c01210a6",
"stats": {
"tools": 160,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 3,
"medium": 1,
"low": 1,
"info": 0
}
}
}