Zulip — the complete, unedited output of the deterministic mcptrustchecker engine v1.8.0, scanned . Every finding, capability tag and score component below is exactly what the engine produced — no AI, no post-processing.
{
"tool": {
"name": "mcptrustchecker",
"version": "1.8.0",
"methodologyVersion": "mcptrustchecker-1.8"
},
"target": {
"id": "zulip-mcp-server",
"source": {
"kind": "package",
"origin": "zulip-mcp-server"
},
"server": {
"name": "zulip-mcp-server"
}
},
"grade": "A",
"score": {
"score": 90,
"threatScore": 98,
"grade": "A",
"band": "A",
"categorySubtotals": {
"injection": 0,
"exfiltration": 0,
"permissions": 0,
"supply-chain": 2.1,
"network": 0,
"hygiene": 0
},
"vector": [
{
"kind": "threat",
"ruleId": "MTC-SUP-011",
"category": "supply-chain",
"severity": "low",
"confidence": "strong",
"rawWeight": 3,
"confidenceMult": 0.7,
"diminishingFactor": 1,
"appliedPenalty": 2.1
},
{
"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": "none",
"label": "publisher verification (unlocatable) — no provenance and no public repository to inspect",
"appliedPenalty": 5
},
{
"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-1.8"
},
"capability": {
"level": "moderate",
"reasons": [
"ingests untrusted external content (a prompt-injection entry point)",
"can send data / act on an external service"
],
"tags": [
"untrusted-input",
"external-sink"
]
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": true,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"Tools were statically extracted from the published source (26 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-005",
"title": "Untrusted input can drive an external action",
"category": "exfiltration",
"severity": "medium",
"confidence": "strong",
"description": "Untrusted-input tools ([start_monitoring, get_unread_messages, discord_start_monitoring, discord_get_unread_messages, Zulip - Unread Messages Summary, Discord - Unread Messages Summary]) co-exist with external-action tools ([send_message, discord_send_message]). 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": "start_monitoring → send_message"
},
"evidence": "untrusted [start_monitoring, get_unread_messages, discord_start_monitoring, discord_get_unread_messages, Zulip - Unread Messages Summary, Discord - Unread Messa",
"owasp": "LLM06:2025 Excessive Agency",
"references": [],
"data": {
"untrusted": [
"start_monitoring",
"get_unread_messages",
"discord_start_monitoring",
"discord_get_unread_messages",
"Zulip - Unread Messages Summary",
"Discord - Unread Messages Summary"
],
"sinks": [
"send_message",
"discord_send_message"
]
}
},
{
"ruleId": "MTC-SUP-011",
"title": "Package has no source repository",
"category": "supply-chain",
"severity": "low",
"confidence": "strong",
"description": "\"zulip-mcp-server\" declares no repository URL, so its published artifact cannot be compared against reviewable source.",
"remediation": "Prefer packages that link to public, reviewable source.",
"location": {
"kind": "package",
"name": "zulip-mcp-server"
}
}
],
"toxicFlows": [
{
"id": "flow-1",
"severity": "medium",
"confidence": "strong",
"untrustedInput": [
"start_monitoring",
"get_unread_messages",
"discord_start_monitoring",
"discord_get_unread_messages",
"Zulip - Unread Messages Summary",
"Discord - Unread Messages Summary"
],
"sensitiveSource": [],
"externalSink": [
"send_message",
"discord_send_message"
],
"selfContained": false,
"description": "Untrusted input can drive an external action even though no sensitive source is exposed."
}
],
"capabilities": [
{
"tool": "start_monitoring",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"read_message\""
]
}
},
{
"tool": "stop_monitoring",
"tags": [],
"reasons": {}
},
{
"tool": "get_monitored_channels",
"tags": [],
"reasons": {}
},
{
"tool": "get_channel_history",
"tags": [],
"reasons": {}
},
{
"tool": "get_unread_messages",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"read_message\""
]
}
},
{
"tool": "send_message",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"send_message\""
]
}
},
{
"tool": "delete_message",
"tags": [],
"reasons": {}
},
{
"tool": "list_streams",
"tags": [],
"reasons": {}
},
{
"tool": "get_stream_topics",
"tags": [],
"reasons": {}
},
{
"tool": "list_users",
"tags": [],
"reasons": {}
},
{
"tool": "get_user_profile",
"tags": [],
"reasons": {}
},
{
"tool": "add_reaction",
"tags": [],
"reasons": {}
},
{
"tool": "find_user",
"tags": [],
"reasons": {}
},
{
"tool": "discord_find_user",
"tags": [],
"reasons": {}
},
{
"tool": "discord_start_monitoring",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"read_message\""
]
}
},
{
"tool": "discord_get_channel_history",
"tags": [],
"reasons": {}
},
{
"tool": "discord_get_unread_messages",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"read_message\""
]
}
},
{
"tool": "discord_send_message",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"send_message\""
]
}
},
{
"tool": "discord_delete_message",
"tags": [],
"reasons": {}
},
{
"tool": "discord_list_channels",
"tags": [],
"reasons": {}
},
{
"tool": "discord_get_monitored_channels",
"tags": [],
"reasons": {}
},
{
"tool": "discord_stop_monitoring",
"tags": [],
"reasons": {}
},
{
"tool": "Zulip - Unread Messages Summary",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"read_message\""
]
}
},
{
"tool": "Zulip - Monitoring Status",
"tags": [],
"reasons": {}
},
{
"tool": "Discord - Unread Messages Summary",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"read_message\""
]
}
},
{
"tool": "Discord - Monitoring Status",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "945f56df29d58959ec8590447361f8930e1fd8edc96b978b3194b99eb182df59",
"stats": {
"tools": 26,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 0,
"medium": 1,
"low": 1,
"info": 0
}
}
}