Stackchan — 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": "stackchan-mcp",
"source": {
"kind": "package",
"origin": "stackchan-mcp"
},
"server": {
"name": "stackchan-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-1.13"
},
"capability": {
"level": "high",
"reasons": [
"can execute shell commands or code"
],
"tags": [
"code-exec"
]
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": true,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"Tools were statically extracted from the published source (49 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 (stackchan_mcp/cli.py)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`stackchan_mcp/cli.py:236`): 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": "stackchan_mcp/cli.py"
},
"evidence": "try: result = subprocess.run( [\"lsof\", f\"-iTCP:{port}\", \"-sTCP:LISTEN\", \"-Fpcn\"], capt",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "stackchan_mcp/cli.py",
"line": 236,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (stackchan_mcp/ownership.py)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`stackchan_mcp/ownership.py:128`): 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": "stackchan_mcp/ownership.py"
},
"evidence": "try: result = subprocess.run( [\"ps\", \"-o\", \"lstart=\", \"-p\", str(pid)], capture_output=",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "stackchan_mcp/ownership.py",
"line": 128,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SUP-012",
"title": "Package has no license",
"category": "hygiene",
"severity": "info",
"confidence": "strong",
"description": "\"stackchan-mcp\" has no declared license. This is a legal/reuse concern, not a security finding.",
"location": {
"kind": "package",
"name": "stackchan-mcp"
}
}
],
"toxicFlows": [],
"capabilities": [
{
"tool": "get_status",
"tags": [],
"reasons": {}
},
{
"tool": "get_device_info",
"tags": [],
"reasons": {}
},
{
"tool": "take_photo",
"tags": [],
"reasons": {}
},
{
"tool": "set_volume",
"tags": [],
"reasons": {}
},
{
"tool": "set_brightness",
"tags": [],
"reasons": {}
},
{
"tool": "move_head",
"tags": [],
"reasons": {}
},
{
"tool": "stackchan_follow_pose_stream",
"tags": [],
"reasons": {}
},
{
"tool": "stackchan_follow_led_stream",
"tags": [],
"reasons": {}
},
{
"tool": "get_head_angles",
"tags": [],
"reasons": {}
},
{
"tool": "gpio_test",
"tags": [],
"reasons": {}
},
{
"tool": "uart_diag",
"tags": [],
"reasons": {}
},
{
"tool": "check_vm_en",
"tags": [],
"reasons": {}
},
{
"tool": "gateway_config_get",
"tags": [],
"reasons": {}
},
{
"tool": "gateway_config_set",
"tags": [],
"reasons": {}
},
{
"tool": "get_touch_sensor_enabled",
"tags": [],
"reasons": {}
},
{
"tool": "set_touch_sensor_enabled",
"tags": [],
"reasons": {}
},
{
"tool": "set_avatar",
"tags": [],
"reasons": {}
},
{
"tool": "set_mouth",
"tags": [],
"reasons": {}
},
{
"tool": "set_mouth_sequence",
"tags": [],
"reasons": {}
},
{
"tool": "set_blink",
"tags": [],
"reasons": {}
},
{
"tool": "set_servo_torque",
"tags": [],
"reasons": {}
},
{
"tool": "set_auto_torque_release",
"tags": [],
"reasons": {}
},
{
"tool": "get_touch_state",
"tags": [],
"reasons": {}
},
{
"tool": "set_led",
"tags": [],
"reasons": {}
},
{
"tool": "set_all_leds",
"tags": [],
"reasons": {}
},
{
"tool": "set_leds",
"tags": [],
"reasons": {}
},
{
"tool": "clear_leds",
"tags": [],
"reasons": {}
},
{
"tool": "port_b_ws2812_init",
"tags": [],
"reasons": {}
},
{
"tool": "port_b_ws2812_set_pixel",
"tags": [],
"reasons": {}
},
{
"tool": "port_b_ws2812_set_strip",
"tags": [],
"reasons": {}
},
{
"tool": "port_b_ws2812_refresh",
"tags": [],
"reasons": {}
},
{
"tool": "port_b_ws2812_clear",
"tags": [],
"reasons": {}
},
{
"tool": "port_c_ws2812_init",
"tags": [],
"reasons": {}
},
{
"tool": "port_c_ws2812_set_pixel",
"tags": [],
"reasons": {}
},
{
"tool": "port_c_ws2812_set_strip",
"tags": [],
"reasons": {}
},
{
"tool": "port_c_ws2812_refresh",
"tags": [],
"reasons": {}
},
{
"tool": "port_c_ws2812_clear",
"tags": [],
"reasons": {}
},
{
"tool": "say",
"tags": [],
"reasons": {}
},
{
"tool": "listen",
"tags": [],
"reasons": {}
},
{
"tool": "beat_mode_start",
"tags": [],
"reasons": {}
},
{
"tool": "beat_mode_stop",
"tags": [],
"reasons": {}
},
{
"tool": "beat_mode_update",
"tags": [],
"reasons": {}
},
{
"tool": "beat_meta_snapshot",
"tags": [],
"reasons": {}
},
{
"tool": "beat_clip_save",
"tags": [],
"reasons": {}
},
{
"tool": "i2c_scan",
"tags": [],
"reasons": {}
},
{
"tool": "i2c_read",
"tags": [],
"reasons": {}
},
{
"tool": "i2c_write",
"tags": [],
"reasons": {}
},
{
"tool": "i2c_write_read",
"tags": [],
"reasons": {}
},
{
"tool": "load_avatar_set",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "61a009e6045312ed164a3cd5dfb2a408ca13f82aee4c45840f187c33dedba112",
"stats": {
"tools": 49,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 2,
"medium": 0,
"low": 0,
"info": 1
}
}
}