Ultimate Unreal Engine — 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": "ultimate-unreal-engine-mcp",
"source": {
"kind": "package",
"origin": "ultimate-unreal-engine-mcp"
},
"server": {
"name": "ultimate-unreal-engine-mcp"
}
},
"grade": "A",
"score": {
"score": 92,
"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": "none",
"label": "publisher verification (unlinked) — no provenance/repo link, but the shipped source was fully read",
"appliedPenalty": 2
},
{
"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": [
"reads sensitive or local data",
"has a read → egress path (a data-exfiltration surface)",
"can execute shell commands or code"
],
"tags": [
"sensitive-source",
"code-exec"
]
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": true,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"Tools were statically extracted from the published source (130 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-004",
"title": "Sensitive-source and external-sink co-exist",
"category": "exfiltration",
"severity": "high",
"confidence": "strong",
"description": "Tools that read sensitive data ([ue_read_config]) and tools that can send data out ([ue_spawn_actor]) are exposed together. An agent can move private data to the sink.",
"remediation": "Keep secret-reading and egress capabilities on separate, separately-approved servers.",
"location": {
"kind": "flow",
"name": "ue_read_config → ue_spawn_actor"
},
"evidence": "sources [ue_read_config] → sinks [ue_spawn_actor]",
"owasp": "LLM02:2025 Sensitive Information Disclosure",
"references": [],
"data": {
"sources": [
"ue_read_config"
],
"sinks": [
"ue_spawn_actor"
]
}
},
{
"ruleId": "MTC-CAP-001",
"title": "Tool \"ue_spawn_actor\" exposes command/code execution",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "Tool \"ue_spawn_actor\" appears to run shell commands or evaluate code (keyword \"spawn\" 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": "ue_spawn_actor"
},
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"tags": [
"code-exec"
]
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (dist/tools/editor/index.js)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`dist/tools/editor/index.js:123`): 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": "dist/tools/editor/index.js"
},
"evidence": "ibe('The actor class to spawn (e.g., AStaticMeshActor)'), location: z.object({ x: z.number()",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "dist/tools/editor/index.js",
"line": 123,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (dist/utils/execFileNoThrow.js)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`dist/utils/execFileNoThrow.js:8`): 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": "dist/utils/execFileNoThrow.js"
},
"evidence": "{ execFile } from 'node:child_process'; /** * Invoke a subprocess using array-form execFile and return its output. * N",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "dist/utils/execFileNoThrow.js",
"line": 8,
"nonRuntime": false
}
},
{
"ruleId": "MTC-CAP-005",
"title": "Mutating tool \"ue_spawn_actor\" declares no destructiveHint",
"category": "hygiene",
"severity": "low",
"confidence": "heuristic",
"description": "Tool \"ue_spawn_actor\" 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": "ue_spawn_actor"
},
"data": {
"tags": [
"code-exec"
]
}
},
{
"ruleId": "MTC-CAP-008",
"title": "Unconstrained path parameter \"config_file\" on \"ue_read_config\"",
"category": "permissions",
"severity": "low",
"confidence": "heuristic",
"description": "Tool \"ue_read_config\" takes a path parameter \"config_file\" with no constraint. Without a canonicalize-and-contain check (not visible statically), this permits ../ traversal outside the intended root.",
"remediation": "Resolve and verify the path stays within an allowed root; reject traversal sequences.",
"location": {
"kind": "tool",
"name": "ue_read_config",
"field": "inputSchema.properties.config_file"
},
"data": {
"param": "config_file"
}
},
{
"ruleId": "MTC-SUP-011",
"title": "Package declares no source repository",
"category": "supply-chain",
"severity": "info",
"confidence": "strong",
"description": "\"ultimate-unreal-engine-mcp\" 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": "ultimate-unreal-engine-mcp"
}
}
],
"toxicFlows": [
{
"id": "flow-1",
"severity": "high",
"confidence": "strong",
"untrustedInput": [],
"sensitiveSource": [
"ue_read_config"
],
"externalSink": [
"ue_spawn_actor"
],
"selfContained": false,
"path": [
"ue_read_config",
"ue_spawn_actor"
],
"pathWired": false,
"description": "A sensitive-source → external-sink chain exists: ue_read_config → ue_spawn_actor."
}
],
"capabilities": [
{
"tool": "ue_inspect_behavior_tree",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_state_tree",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_blackboard",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_eqs",
"tags": [],
"reasons": {}
},
{
"tool": "ue_query_navmesh",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_animation_assets",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_anim_blueprint",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_montage",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_blend_space",
"tags": [],
"reasons": {}
},
{
"tool": "ue_read_retarget_mappings",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_sound_assets",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_metasound",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_sound_cue",
"tags": [],
"reasons": {}
},
{
"tool": "ue_query_audio_insights",
"tags": [],
"reasons": {}
},
{
"tool": "ue_read_blueprint",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_blueprints",
"tags": [],
"reasons": {}
},
{
"tool": "ue_read_blueprint_graph",
"tags": [],
"reasons": {}
},
{
"tool": "ue_create_blueprint",
"tags": [],
"reasons": {}
},
{
"tool": "ue_add_blueprint_node",
"tags": [],
"reasons": {}
},
{
"tool": "ue_connect_blueprint_pins",
"tags": [],
"reasons": {}
},
{
"tool": "ue_add_blueprint_variable",
"tags": [],
"reasons": {}
},
{
"tool": "ue_set_blueprint_default",
"tags": [],
"reasons": {}
},
{
"tool": "ue_cpp_exposed_members",
"tags": [],
"reasons": {}
},
{
"tool": "ue_find_blueprint_subclasses",
"tags": [],
"reasons": {}
},
{
"tool": "ue_trace_cpp_in_blueprints",
"tags": [],
"reasons": {}
},
{
"tool": "ue_build",
"tags": [],
"reasons": {}
},
{
"tool": "ue_get_build_errors",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_geometry_collection",
"tags": [],
"reasons": {}
},
{
"tool": "ue_reset_destruction",
"tags": [],
"reasons": {}
},
{
"tool": "ue_read_cloth_params",
"tags": [],
"reasons": {}
},
{
"tool": "ue_manage_physics_cache",
"tags": [],
"reasons": {}
},
{
"tool": "ue_read_collision",
"tags": [],
"reasons": {}
},
{
"tool": "ue_set_collision",
"tags": [],
"reasons": {}
},
{
"tool": "ue_manage_physical_material",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_physics_asset",
"tags": [],
"reasons": {}
},
{
"tool": "ue_read_config",
"tags": [
"sensitive-source"
],
"reasons": {
"sensitive-source": [
"keyword \"read_config\""
]
}
},
{
"tool": "ue_write_config",
"tags": [],
"reasons": {}
},
{
"tool": "ue_read_uproject",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_plugins",
"tags": [],
"reasons": {}
},
{
"tool": "ue_read_cpp_class",
"tags": [],
"reasons": {}
},
{
"tool": "ue_get_class_hierarchy",
"tags": [],
"reasons": {}
},
{
"tool": "ue_trace_includes",
"tags": [],
"reasons": {}
},
{
"tool": "ue_find_class_file",
"tags": [],
"reasons": {}
},
{
"tool": "ue_generate_class",
"tags": [],
"reasons": {}
},
{
"tool": "ue_add_property",
"tags": [],
"reasons": {}
},
{
"tool": "ue_add_function",
"tags": [],
"reasons": {}
},
{
"tool": "ue_add_include",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_actors",
"tags": [],
"reasons": {}
},
{
"tool": "ue_spawn_actor",
"tags": [
"code-exec"
],
"reasons": {
"code-exec": [
"keyword \"spawn\" in tool name"
]
}
},
{
"tool": "ue_set_actor_property",
"tags": [],
"reasons": {}
},
{
"tool": "ue_create_data_asset",
"tags": [],
"reasons": {}
},
{
"tool": "ue_create_curve",
"tags": [],
"reasons": {}
},
{
"tool": "ue_transform_actor",
"tags": [],
"reasons": {}
},
{
"tool": "ue_delete_actor",
"tags": [],
"reasons": {}
},
{
"tool": "ue_query_assets",
"tags": [],
"reasons": {}
},
{
"tool": "ue_trace_references",
"tags": [],
"reasons": {}
},
{
"tool": "ue_read_level_layout",
"tags": [],
"reasons": {}
},
{
"tool": "ue_get_component_bounds",
"tags": [],
"reasons": {}
},
{
"tool": "ue_rebuild",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_abilities",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_gameplay_effect",
"tags": [],
"reasons": {}
},
{
"tool": "ue_read_attribute_set",
"tags": [],
"reasons": {}
},
{
"tool": "ue_query_gameplay_tags",
"tags": [],
"reasons": {}
},
{
"tool": "ue_import_fbx",
"tags": [],
"reasons": {}
},
{
"tool": "ue_import_usd",
"tags": [],
"reasons": {}
},
{
"tool": "ue_export_mesh",
"tags": [],
"reasons": {}
},
{
"tool": "ue_batch_import",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_input_actions",
"tags": [],
"reasons": {}
},
{
"tool": "ue_create_input_action",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_input_contexts",
"tags": [],
"reasons": {}
},
{
"tool": "ue_add_input_binding",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_known_issues",
"tags": [],
"reasons": {}
},
{
"tool": "ue_add_known_issue",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_livelink_sources",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_livelink_subjects",
"tags": [],
"reasons": {}
},
{
"tool": "ue_control_livelink_subject",
"tags": [],
"reasons": {}
},
{
"tool": "ue_preview_livelink_data",
"tags": [],
"reasons": {}
},
{
"tool": "ue_material_params",
"tags": [],
"reasons": {}
},
{
"tool": "ue_create_material_instance",
"tags": [],
"reasons": {}
},
{
"tool": "ue_set_material_param",
"tags": [],
"reasons": {}
},
{
"tool": "ue_actor_materials",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_scene_states",
"tags": [],
"reasons": {}
},
{
"tool": "ue_trigger_scene_transition",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_transition_logic",
"tags": [],
"reasons": {}
},
{
"tool": "ue_manage_remote_control",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_render_queue",
"tags": [],
"reasons": {}
},
{
"tool": "ue_add_render_job",
"tags": [],
"reasons": {}
},
{
"tool": "ue_control_render_queue",
"tags": [],
"reasons": {}
},
{
"tool": "ue_configure_render_output",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_replication",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_replicated_properties",
"tags": [],
"reasons": {}
},
{
"tool": "ue_read_net_driver",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_session",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_pcg_graphs",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_pcg_graph",
"tags": [],
"reasons": {}
},
{
"tool": "ue_execute_pcg_graph",
"tags": [],
"reasons": {}
},
{
"tool": "ue_query_pcg_results",
"tags": [],
"reasons": {}
},
{
"tool": "ue_select_actors",
"tags": [],
"reasons": {}
},
{
"tool": "ue_get_selection",
"tags": [],
"reasons": {}
},
{
"tool": "ue_duplicate_actors",
"tags": [],
"reasons": {}
},
{
"tool": "ue_convert_actor",
"tags": [],
"reasons": {}
},
{
"tool": "ue_create_sequence",
"tags": [],
"reasons": {}
},
{
"tool": "ue_list_sequence_tracks",
"tags": [],
"reasons": {}
},
{
"tool": "ue_add_sequence_track",
"tags": [],
"reasons": {}
},
{
"tool": "ue_add_keyframe",
"tags": [],
"reasons": {}
},
{
"tool": "ue_sequence_playback",
"tags": [],
"reasons": {}
},
{
"tool": "ue_validate_asset",
"tags": [],
"reasons": {}
},
{
"tool": "ue_validate_folder",
"tags": [],
"reasons": {}
},
{
"tool": "ue_validate_project",
"tags": [],
"reasons": {}
},
{
"tool": "ue_check_blueprint",
"tags": [],
"reasons": {}
},
{
"tool": "ue_editor_state",
"tags": [],
"reasons": {}
},
{
"tool": "ue_pie_start",
"tags": [],
"reasons": {}
},
{
"tool": "ue_pie_stop",
"tags": [],
"reasons": {}
},
{
"tool": "ue_pie_logs",
"tags": [],
"reasons": {}
},
{
"tool": "ue_pie_game_state",
"tags": [],
"reasons": {}
},
{
"tool": "ue_viewport_screenshot",
"tags": [],
"reasons": {}
},
{
"tool": "ue_viewport_camera",
"tags": [],
"reasons": {}
},
{
"tool": "ue_viewport_render_mode",
"tags": [],
"reasons": {}
},
{
"tool": "ue_viewport_hires_screenshot",
"tags": [],
"reasons": {}
},
{
"tool": "ue_visual_review",
"tags": [],
"reasons": {}
},
{
"tool": "ue_look_at",
"tags": [],
"reasons": {}
},
{
"tool": "ue_orbit_review",
"tags": [],
"reasons": {}
},
{
"tool": "ue_iterate_scene",
"tags": [],
"reasons": {}
},
{
"tool": "ue_fly_through",
"tags": [],
"reasons": {}
},
{
"tool": "ue_focus_actor",
"tags": [],
"reasons": {}
},
{
"tool": "ue_cleanup_screenshots",
"tags": [],
"reasons": {}
},
{
"tool": "ue_read_world_partition",
"tags": [],
"reasons": {}
},
{
"tool": "ue_manage_data_layers",
"tags": [],
"reasons": {}
},
{
"tool": "ue_inspect_streaming_sources",
"tags": [],
"reasons": {}
},
{
"tool": "ue_trigger_hlod_generation",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "ae233edeea0c0e716c556d1971cd3b29f79308ce6c39d2fcc6077282bcf67cac",
"stats": {
"tools": 130,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 4,
"medium": 0,
"low": 2,
"info": 1
}
}
}