Cygnus Ssh — the complete, unedited output of the deterministic mcptrustchecker engine v1.9.0, scanned . Every finding, capability tag and score component below is exactly what the engine produced — no AI, no post-processing.
{
"tool": {
"name": "mcptrustchecker",
"version": "1.9.0",
"methodologyVersion": "mcptrustchecker-1.9"
},
"target": {
"id": "cygnus-ssh-mcp",
"source": {
"kind": "package",
"origin": "cygnus-ssh-mcp"
},
"server": {
"name": "cygnus-ssh-mcp"
}
},
"grade": "A",
"score": {
"score": 96,
"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": "moderate",
"label": "capability blast radius (moderate) — client exposure if the model is manipulated",
"appliedPenalty": 3
},
{
"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-1.9"
},
"capability": {
"level": "moderate",
"reasons": [
"can create, modify or delete files",
"reads sensitive or local data"
],
"tags": [
"sensitive-source",
"file-write"
]
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": true,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"Tools were statically extracted from the published source (46 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-006",
"title": "Reads a sensitive credential path or dumps the environment (src/cygnus_ssh_mcp/server.py)",
"category": "exfiltration",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`src/cygnus_ssh_mcp/server.py:319`): Reading private keys / cloud credentials, or serializing the whole environment, is a sensitive-data source that becomes exfiltration when combined with any egress. 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/cygnus_ssh_mcp/server.py"
},
"evidence": "key file (e.g., ~/.ssh/id_rsa)\")] = None, key_passphrase: Annotated[Optional[str], Field(description=\"Passphrase fo",
"owasp": "LLM02:2025 Sensitive Information Disclosure",
"data": {
"rule": "MTC-SRC-006",
"file": "src/cygnus_ssh_mcp/server.py",
"line": 319,
"nonRuntime": false
}
},
{
"ruleId": "MTC-CAP-002",
"title": "Tool \"ssh_dir_batch_delete_files\" can modify the filesystem",
"category": "permissions",
"severity": "medium",
"confidence": "strong",
"description": "Tool \"ssh_dir_batch_delete_files\" can write, overwrite or delete files (keyword \"delete_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": "ssh_dir_batch_delete_files"
},
"data": {
"tags": [
"file-write"
]
}
},
{
"ruleId": "MTC-CAP-005",
"title": "Mutating tool \"ssh_dir_batch_delete_files\" declares no destructiveHint",
"category": "hygiene",
"severity": "low",
"confidence": "heuristic",
"description": "Tool \"ssh_dir_batch_delete_files\" 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": "ssh_dir_batch_delete_files"
},
"data": {
"tags": [
"file-write"
]
}
},
{
"ruleId": "MTC-SUP-012",
"title": "Package has no license",
"category": "hygiene",
"severity": "info",
"confidence": "strong",
"description": "\"cygnus-ssh-mcp\" has no declared license. This is a legal/reuse concern, not a security finding.",
"location": {
"kind": "package",
"name": "cygnus-ssh-mcp"
}
}
],
"toxicFlows": [],
"capabilities": [
{
"tool": "list_tools",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_conn_is_connected",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_conn_connect",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_conn_add_host",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_host_update",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_conn_status",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_conn_host_info",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_host_use_config",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_host_list",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_host_remove",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_host_disconnect",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_conn_verify_sudo",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_task_status",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_task_kill",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_cmd_run",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_cmd_kill",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_cmd_check_status",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_cmd_output",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_cmd_clear_history",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_cmd_history",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_task_launch",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_dir_mkdir",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_dir_remove",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_dir_list_files_basic",
"tags": [
"sensitive-source"
],
"reasons": {
"sensitive-source": [
"keyword \"list_files\""
]
}
},
{
"tool": "ssh_file_stat",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_file_read",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_file_find_lines_with_pattern",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_file_get_context_around_line",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_file_replace_line",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_file_replace_line_multi",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_file_transfer",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_dir_transfer",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_file_insert_lines_after_match",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_file_delete_line_by_content",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_file_copy",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_file_write",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_file_move",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_dir_search_glob",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_dir_calc_size",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_dir_delete",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_dir_batch_delete_files",
"tags": [
"file-write"
],
"reasons": {
"file-write": [
"keyword \"delete_file\" in tool name"
]
}
},
{
"tool": "ssh_dir_list_advanced",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_dir_search_files_content",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_dir_copy",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_archive_create",
"tags": [],
"reasons": {}
},
{
"tool": "ssh_archive_extract",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "caf1b2b6380f8550d81cd651856e5618e4053dbe29ada5c6fc765a4380fd7872",
"stats": {
"tools": 46,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 1,
"medium": 1,
"low": 1,
"info": 1
}
}
}