Raw scan report

Extension Tools — 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.

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{
  "tool": {
    "name": "mcptrustchecker",
    "version": "1.13.0",
    "methodologyVersion": "mcptrustchecker-1.13"
  },
  "target": {
    "id": "@mcp-b/extension-tools",
    "source": {
      "kind": "package",
      "origin": "@mcp-b/extension-tools"
    },
    "server": {
      "name": "@mcp-b/extension-tools"
    }
  },
  "grade": "A",
  "score": {
    "score": 90,
    "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": "critical",
        "label": "capability blast radius (critical) — client exposure if the model is manipulated",
        "appliedPenalty": 10
      },
      {
        "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": "critical",
    "reasons": [
      "ingests untrusted external content (a prompt-injection entry point)",
      "can create, modify or delete files",
      "reads sensitive or local data",
      "has a read → egress path (a data-exfiltration surface)",
      "can execute shell commands or code",
      "untrusted-input, sensitive-source and egress co-exist across tools (toxic-flow surface)",
      "untrusted input can reach code execution"
    ],
    "tags": [
      "untrusted-input",
      "file-write",
      "code-exec",
      "sensitive-source"
    ]
  },
  "coverage": {
    "level": "source",
    "inputs": {
      "toolSurface": true,
      "implementationSource": true,
      "packageMetadata": true,
      "liveTransport": false
    },
    "caveats": [
      "Tools were statically extracted from the published source (200 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: extension_tool_accept_danger → extension_tool_get_tokens → extension_tool_clear_font. 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": "extension_tool_accept_danger → extension_tool_get_tokens → extension_tool_clear_font"
      },
      "owasp": "LLM02:2025 Sensitive Information Disclosure",
      "references": [],
      "data": {
        "untrusted": [
          "extension_tool_remove_downloads",
          "extension_tool_download_file",
          "extension_tool_pause_download",
          "extension_tool_resume_download",
          "extension_tool_cancel_download",
          "extension_tool_get_file_icon",
          "extension_tool_open_download",
          "extension_tool_show_download",
          "extension_tool_remove_file",
          "extension_tool_accept_danger",
          "extension_tool_set_ui_options"
        ],
        "sources": [
          "extension_tool_get_tokens"
        ],
        "sinks": [
          "extension_tool_eval_inspected_window",
          "extension_tool_get_font",
          "extension_tool_set_font",
          "extension_tool_clear_font"
        ],
        "path": [
          "extension_tool_accept_danger",
          "extension_tool_get_tokens",
          "extension_tool_clear_font"
        ],
        "edges": [
          {
            "from": "extension_tool_accept_danger",
            "to": "extension_tool_get_tokens",
            "kind": "agent-mediated"
          },
          {
            "from": "extension_tool_get_tokens",
            "to": "extension_tool_clear_font",
            "kind": "agent-mediated"
          }
        ],
        "wired": false
      }
    },
    {
      "ruleId": "MTC-CAP-001",
      "title": "Tool \"extension_tool_eval_inspected_window\" exposes command/code execution",
      "category": "permissions",
      "severity": "high",
      "confidence": "strong",
      "description": "Tool \"extension_tool_eval_inspected_window\" appears to run shell commands or evaluate code (keyword \"eval\" 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": "extension_tool_eval_inspected_window"
      },
      "owasp": "LLM05:2025 Improper Output Handling",
      "data": {
        "tags": [
          "code-exec"
        ]
      }
    },
    {
      "ruleId": "MTC-CAP-001",
      "title": "Tool \"extension_tool_get_font\" exposes command/code execution",
      "category": "permissions",
      "severity": "high",
      "confidence": "strong",
      "description": "Tool \"extension_tool_get_font\" appears to run shell commands or evaluate code (parameter \"script\"). 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": "extension_tool_get_font"
      },
      "owasp": "LLM05:2025 Improper Output Handling",
      "data": {
        "tags": [
          "code-exec"
        ]
      }
    },
    {
      "ruleId": "MTC-CAP-001",
      "title": "Tool \"extension_tool_set_font\" exposes command/code execution",
      "category": "permissions",
      "severity": "high",
      "confidence": "strong",
      "description": "Tool \"extension_tool_set_font\" appears to run shell commands or evaluate code (parameter \"script\"). 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": "extension_tool_set_font"
      },
      "owasp": "LLM05:2025 Improper Output Handling",
      "data": {
        "tags": [
          "code-exec"
        ]
      }
    },
    {
      "ruleId": "MTC-CAP-001",
      "title": "Tool \"extension_tool_clear_font\" exposes command/code execution",
      "category": "permissions",
      "severity": "high",
      "confidence": "strong",
      "description": "Tool \"extension_tool_clear_font\" appears to run shell commands or evaluate code (parameter \"script\"). 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": "extension_tool_clear_font"
      },
      "owasp": "LLM05:2025 Improper Output Handling",
      "data": {
        "tags": [
          "code-exec"
        ]
      }
    },
    {
      "ruleId": "MTC-CAP-007",
      "title": "Unconstrained URL/host parameter \"url\" on \"extension_tool_download_file\"",
      "category": "network",
      "severity": "medium",
      "confidence": "heuristic",
      "description": "Tool \"extension_tool_download_file\" takes a URL/host parameter \"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": "extension_tool_download_file",
        "field": "inputSchema.properties.url"
      },
      "owasp": "LLM06:2025 Excessive Agency",
      "data": {
        "param": "url"
      }
    },
    {
      "ruleId": "MTC-CAP-002",
      "title": "Tool \"extension_tool_remove_file_systems\" can modify the filesystem",
      "category": "permissions",
      "severity": "medium",
      "confidence": "strong",
      "description": "Tool \"extension_tool_remove_file_systems\" can write, overwrite or delete files (keyword \"remove_file\" in tool name). Verify it is scoped to a safe directory.",
      "remediation": "Constrain file operations to an explicit, non-sensitive root; reject path traversal.",
      "location": {
        "kind": "tool",
        "name": "extension_tool_remove_file_systems"
      },
      "data": {
        "tags": [
          "file-write"
        ]
      }
    },
    {
      "ruleId": "MTC-CAP-002",
      "title": "Tool \"extension_tool_remove_file\" can modify the filesystem",
      "category": "permissions",
      "severity": "medium",
      "confidence": "strong",
      "description": "Tool \"extension_tool_remove_file\" can write, overwrite or delete files (keyword \"remove_file\" in tool name). Verify it is scoped to a safe directory.",
      "remediation": "Constrain file operations to an explicit, non-sensitive root; reject path traversal.",
      "location": {
        "kind": "tool",
        "name": "extension_tool_remove_file"
      },
      "data": {
        "tags": [
          "untrusted-input",
          "file-write"
        ]
      }
    },
    {
      "ruleId": "MTC-CAP-006",
      "title": "Unconstrained command parameter \"script\" on \"extension_tool_get_font\"",
      "category": "permissions",
      "severity": "medium",
      "confidence": "heuristic",
      "description": "Tool \"extension_tool_get_font\" takes a command-shaped parameter \"script\" with no enum/pattern constraint. Free-form, model- or attacker-controlled arguments reaching a shell is the command-injection precondition.",
      "remediation": "Constrain the parameter (enum/pattern), or build the command from a fixed template with escaped args.",
      "location": {
        "kind": "tool",
        "name": "extension_tool_get_font",
        "field": "inputSchema.properties.script"
      },
      "owasp": "LLM05:2025 Improper Output Handling",
      "data": {
        "param": "script"
      }
    },
    {
      "ruleId": "MTC-CAP-006",
      "title": "Unconstrained command parameter \"script\" on \"extension_tool_set_font\"",
      "category": "permissions",
      "severity": "medium",
      "confidence": "heuristic",
      "description": "Tool \"extension_tool_set_font\" takes a command-shaped parameter \"script\" with no enum/pattern constraint. Free-form, model- or attacker-controlled arguments reaching a shell is the command-injection precondition.",
      "remediation": "Constrain the parameter (enum/pattern), or build the command from a fixed template with escaped args.",
      "location": {
        "kind": "tool",
        "name": "extension_tool_set_font",
        "field": "inputSchema.properties.script"
      },
      "owasp": "LLM05:2025 Improper Output Handling",
      "data": {
        "param": "script"
      }
    },
    {
      "ruleId": "MTC-CAP-006",
      "title": "Unconstrained command parameter \"script\" on \"extension_tool_clear_font\"",
      "category": "permissions",
      "severity": "medium",
      "confidence": "heuristic",
      "description": "Tool \"extension_tool_clear_font\" takes a command-shaped parameter \"script\" with no enum/pattern constraint. Free-form, model- or attacker-controlled arguments reaching a shell is the command-injection precondition.",
      "remediation": "Constrain the parameter (enum/pattern), or build the command from a fixed template with escaped args.",
      "location": {
        "kind": "tool",
        "name": "extension_tool_clear_font",
        "field": "inputSchema.properties.script"
      },
      "owasp": "LLM05:2025 Improper Output Handling",
      "data": {
        "param": "script"
      }
    },
    {
      "ruleId": "MTC-CAP-005",
      "title": "Mutating tool \"extension_tool_remove_file_systems\" declares no destructiveHint",
      "category": "hygiene",
      "severity": "low",
      "confidence": "heuristic",
      "description": "Tool \"extension_tool_remove_file_systems\" 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": "extension_tool_remove_file_systems"
      },
      "data": {
        "tags": [
          "file-write"
        ]
      }
    },
    {
      "ruleId": "MTC-CAP-005",
      "title": "Mutating tool \"extension_tool_eval_inspected_window\" declares no destructiveHint",
      "category": "hygiene",
      "severity": "low",
      "confidence": "heuristic",
      "description": "Tool \"extension_tool_eval_inspected_window\" 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": "extension_tool_eval_inspected_window"
      },
      "data": {
        "tags": [
          "code-exec"
        ]
      }
    },
    {
      "ruleId": "MTC-CAP-005",
      "title": "Mutating tool \"extension_tool_remove_file\" declares no destructiveHint",
      "category": "hygiene",
      "severity": "low",
      "confidence": "heuristic",
      "description": "Tool \"extension_tool_remove_file\" 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": "extension_tool_remove_file"
      },
      "data": {
        "tags": [
          "untrusted-input",
          "file-write"
        ]
      }
    },
    {
      "ruleId": "MTC-CAP-005",
      "title": "Mutating tool \"extension_tool_get_font\" declares no destructiveHint",
      "category": "hygiene",
      "severity": "low",
      "confidence": "heuristic",
      "description": "Tool \"extension_tool_get_font\" 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": "extension_tool_get_font"
      },
      "data": {
        "tags": [
          "code-exec"
        ]
      }
    },
    {
      "ruleId": "MTC-CAP-005",
      "title": "Mutating tool \"extension_tool_set_font\" declares no destructiveHint",
      "category": "hygiene",
      "severity": "low",
      "confidence": "heuristic",
      "description": "Tool \"extension_tool_set_font\" 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": "extension_tool_set_font"
      },
      "data": {
        "tags": [
          "code-exec"
        ]
      }
    },
    {
      "ruleId": "MTC-CAP-005",
      "title": "Mutating tool \"extension_tool_clear_font\" declares no destructiveHint",
      "category": "hygiene",
      "severity": "low",
      "confidence": "heuristic",
      "description": "Tool \"extension_tool_clear_font\" 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": "extension_tool_clear_font"
      },
      "data": {
        "tags": [
          "code-exec"
        ]
      }
    }
  ],
  "toxicFlows": [
    {
      "id": "flow-1",
      "severity": "critical",
      "confidence": "strong",
      "untrustedInput": [
        "extension_tool_remove_downloads",
        "extension_tool_download_file",
        "extension_tool_pause_download",
        "extension_tool_resume_download",
        "extension_tool_cancel_download",
        "extension_tool_get_file_icon",
        "extension_tool_open_download",
        "extension_tool_show_download",
        "extension_tool_remove_file",
        "extension_tool_accept_danger",
        "extension_tool_set_ui_options"
      ],
      "sensitiveSource": [
        "extension_tool_get_tokens"
      ],
      "externalSink": [
        "extension_tool_eval_inspected_window",
        "extension_tool_get_font",
        "extension_tool_set_font",
        "extension_tool_clear_font"
      ],
      "selfContained": false,
      "path": [
        "extension_tool_accept_danger",
        "extension_tool_get_tokens",
        "extension_tool_clear_font"
      ],
      "pathWired": false,
      "description": "A cross-tool exfiltration chain exists: extension_tool_accept_danger → extension_tool_get_tokens → extension_tool_clear_font."
    }
  ],
  "capabilities": [
    {
      "tool": "extension_tool_create_alarm",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_alarm",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_all_alarms",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_clear_alarm",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_clear_all_alarms",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_audio_devices",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_audio_mute",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_set_active_audio_devices",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_set_audio_mute",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_set_audio_device_properties",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_bookmark_operations",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_bookmark_parameters_description",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_remove_browsing_data",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_remove_appcache",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_remove_cache",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_remove_cache_storage",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_remove_cookies",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_remove_downloads",
      "tags": [
        "untrusted-input"
      ],
      "reasons": {
        "untrusted-input": [
          "keyword \"download\""
        ]
      }
    },
    {
      "tool": "extension_tool_remove_file_systems",
      "tags": [
        "file-write"
      ],
      "reasons": {
        "file-write": [
          "keyword \"remove_file\" in tool name"
        ]
      }
    },
    {
      "tool": "extension_tool_remove_form_data",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_remove_history",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_remove_indexed_db",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_remove_local_storage",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_remove_passwords",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_remove_service_workers",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_remove_web_sql",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_browsing_data_settings",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_set_certificates",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_report_signature",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_request_pin",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_stop_pin_request",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_listen_certificates_update_requested",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_listen_signature_requested",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_all_commands",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_cookies_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_set_cookies_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_clear_cookies_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_javascript_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_set_javascript_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_clear_javascript_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_images_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_set_images_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_clear_images_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_location_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_set_location_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_clear_location_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_notifications_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_set_notifications_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_clear_notifications_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_popups_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_set_popups_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_clear_popups_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_camera_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_set_camera_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_clear_camera_setting",
      "tags": [],
      "reasons": {}
    },
    {
      "tool": "extension_tool_get_microphone_setting",
      "tags": [],
      "reasons": {}
    },
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