Complete UE5 agent runtime — give AI coding agents full control of Unreal Engine 5: Blueprints, materials, sequencer, MRQ, World Partition, cook/package. Dual harness for Claude Code and GitHub Copilot.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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PoBruno
Source: github_code
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Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
When Vitest UI server is listening, arbitrary file can be read and executed
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
UE_EDITOR_CMDUE_HEALTH_TIMEOUT_MSUE_PORTUE_PROJECT_DIRTool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
187/187 tools missing one or more hints — find_actors_by_tag (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); find_actors_by_class (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); find_actors_in_radius (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +184 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Tool inputs are validated
167/187 tool handlers declare input schemas (89%)
Declare an inputSchema with zod/joi/yup on every tool definition.
Tool handlers catch errors
179/187 tool handlers wrap calls in try/catch (96%)
Wrap each tool handler body in try/catch and return a structured error response.
README present
No README found
Add a README.md describing the server and its tools.
License file
No license file
Add a LICENSE file (MIT, Apache-2.0, etc.).
Tool test coverage
Only 45/187 tools referenced in tests (24%)
Write tests that reference each tool by name so every tool has at least one test.
Tests pass
npm test failed — tests do not pass
Make sure npm test runs cleanly. Common cause: missing build step or missing env vars.
Shell command execution
2 child_process calls — runs shell commands
Prefer library functions over shell-outs. If you must shell out, ensure all inputs are properly escaped.
Production dependencies are patched
0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.12.1 (high), @modelcontextprotocol/sdk@1.12.1 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Dev dependencies
1 critical/high in dev-only deps (does not ship to users)
Upgrade dev dependencies when convenient.
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