Legion — 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": "legion-mcp",
"source": {
"kind": "package",
"origin": "legion-mcp"
},
"server": {
"name": "legion-mcp"
}
},
"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-1.9"
},
"capability": {
"level": "high",
"reasons": [
"ingests untrusted external content (a prompt-injection entry point)",
"can execute shell commands or code"
],
"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 (48 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 (src/legion_mcp/proxy/cognitive_extractor.py)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`src/legion_mcp/proxy/cognitive_extractor.py:494`): 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/legion_mcp/proxy/cognitive_extractor.py"
},
"evidence": "process = subprocess.Popen( cmd, stdin=subprocess.PIPE, st",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "src/legion_mcp/proxy/cognitive_extractor.py",
"line": 494,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (src/legion_mcp/proxy_manager.py)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`src/legion_mcp/proxy_manager.py:122`): 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/legion_mcp/proxy_manager.py"
},
"evidence": "try: result = subprocess.run( [\"lsof\", \"-ti\", f\":{port}\"], capture_output=True, text=T",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "src/legion_mcp/proxy_manager.py",
"line": 122,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (src/legion_mcp/tools/delegation.py)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`src/legion_mcp/tools/delegation.py:919`): 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/legion_mcp/tools/delegation.py"
},
"evidence": ") process = subprocess.Popen( cmd, stdin=subprocess.PIPE, st",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "src/legion_mcp/tools/delegation.py",
"line": 919,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SUP-012",
"title": "Package has no license",
"category": "hygiene",
"severity": "info",
"confidence": "strong",
"description": "\"legion-mcp\" has no declared license. This is a legal/reuse concern, not a security finding.",
"location": {
"kind": "package",
"name": "legion-mcp"
}
}
],
"toxicFlows": [],
"capabilities": [
{
"tool": "authenticateUser",
"tags": [],
"reasons": {}
},
{
"tool": "getProjects",
"tags": [],
"reasons": {}
},
{
"tool": "createKnowledge",
"tags": [],
"reasons": {}
},
{
"tool": "createCode",
"tags": [],
"reasons": {}
},
{
"tool": "createExpertise",
"tags": [],
"reasons": {}
},
{
"tool": "addExpertiseChunk",
"tags": [],
"reasons": {}
},
{
"tool": "listExpertise",
"tags": [],
"reasons": {}
},
{
"tool": "getExpertise",
"tags": [],
"reasons": {}
},
{
"tool": "updateExpertise",
"tags": [],
"reasons": {}
},
{
"tool": "recordLesson",
"tags": [],
"reasons": {}
},
{
"tool": "whoAmI",
"tags": [],
"reasons": {}
},
{
"tool": "activateWorkflow",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "createWorkflow",
"tags": [],
"reasons": {}
},
{
"tool": "updateWorkflow",
"tags": [],
"reasons": {}
},
{
"tool": "deleteWorkflow",
"tags": [],
"reasons": {}
},
{
"tool": "listWorkflows",
"tags": [],
"reasons": {}
},
{
"tool": "linkAgentSkill",
"tags": [],
"reasons": {}
},
{
"tool": "unlinkAgentSkill",
"tags": [],
"reasons": {}
},
{
"tool": "createAgent",
"tags": [],
"reasons": {}
},
{
"tool": "deleteAgent",
"tags": [],
"reasons": {}
},
{
"tool": "updateAgent",
"tags": [],
"reasons": {}
},
{
"tool": "createEngagement",
"tags": [],
"reasons": {}
},
{
"tool": "getEngagement",
"tags": [],
"reasons": {}
},
{
"tool": "getEntry",
"tags": [],
"reasons": {}
},
{
"tool": "listEngagements",
"tags": [],
"reasons": {}
},
{
"tool": "updateEngagement",
"tags": [],
"reasons": {}
},
{
"tool": "addEntry",
"tags": [],
"reasons": {}
},
{
"tool": "updateEntry",
"tags": [],
"reasons": {}
},
{
"tool": "searchEntries",
"tags": [],
"reasons": {}
},
{
"tool": "resumeEngagement",
"tags": [],
"reasons": {}
},
{
"tool": "createTask",
"tags": [],
"reasons": {}
},
{
"tool": "getTask",
"tags": [],
"reasons": {}
},
{
"tool": "listTasks",
"tags": [],
"reasons": {}
},
{
"tool": "updateTask",
"tags": [],
"reasons": {}
},
{
"tool": "assignTask",
"tags": [],
"reasons": {}
},
{
"tool": "completeTask",
"tags": [],
"reasons": {}
},
{
"tool": "linkArtifact",
"tags": [],
"reasons": {}
},
{
"tool": "delegate_to_agent",
"tags": [],
"reasons": {}
},
{
"tool": "get_delegation_status",
"tags": [],
"reasons": {}
},
{
"tool": "get_delegation_result",
"tags": [],
"reasons": {}
},
{
"tool": "list_delegations",
"tags": [],
"reasons": {}
},
{
"tool": "cancel_delegation",
"tags": [],
"reasons": {}
},
{
"tool": "getIngestionStatus",
"tags": [],
"reasons": {}
},
{
"tool": "listIngestions",
"tags": [],
"reasons": {}
},
{
"tool": "start_proxy",
"tags": [],
"reasons": {}
},
{
"tool": "stop_proxy",
"tags": [],
"reasons": {}
},
{
"tool": "proxy_status",
"tags": [],
"reasons": {}
},
{
"tool": "whatIKnow",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "a89c415428befe90a893cdf300ba9f149e7ea48f2e6ce2791095b1a6bb9fe731",
"stats": {
"tools": 48,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 3,
"medium": 0,
"low": 0,
"info": 1
}
}
}