yes-ue-mcp: Native C++ Model Context Protocol (MCP) plugin for Unreal Engine 5.4+

by softdaddy-o · MCP Server · ★ 88

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Featured in: Blender, Unity & Godot MCP

Security audit verdict: SAFE · quality 50/100

None of the 42 rules matched — no credential harvesting, no data exfiltration, no curl-pipe-shell installer. Scanned against 42 published rules built on the SlowMist agent-security taxonomy, refreshed every 8 hours.

The quality score combines nine heuristic checks of the repo and its README: completeness, clarity, specificity, examples, structure, agent readiness, step-by-step content, instruction quality and security notes. It rates how well the project explains itself to an agent, not the code.

Quick Facts

Stars88
Forks22
LanguageC++
CategoryMCP Server
LicenseMIT
Quality Score50/100
Open Issues1
Last Updated2026-03-16
Created2025-12-16
Platformsmcp
Est. Tokens~38k

About yes-ue-mcp

yes-ue-mcp DEPRECATED — This project has been superseded by soft-ue-cli. Migration Install the new CLI: soft-ue-cli provides 50+ commands for controlling Unreal Engine from AI coding agents like Claude Code — including everything yes-ue-mcp offered plus Blueprint editing, PIE control, performance profiling, StateTree manipulation, and more. See the soft-ue-cli README for full documentation.

Compatible Skills

These tools work well together with yes-ue-mcp for enhanced workflows:

  • ue-llm-toolkit — semantic(0.37)+complementary+same_lang+similar_pop (53%)
  • ue5-mcp — semantic(0.56)+same_lang+similar_pop+shared_platform (50%)
  • Unreal_mcp — semantic(0.72)+same_lang+shared_platform (45%)

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How this security grade is produced

Grades come from a rule-based scan built on the SlowMist agent-security taxonomy: 42 published rules, covering credential harvesting, data exfiltration, curl | sh installers and more. It is a first-layer scan, not a manual audit — we say so rather than overstate it.

The scale of the problem is documented independently: Liu et al. (2026), in a study of 31,132 agent skills, report that 26.1% contain security vulnerabilities. Our own full-catalog census is published as a citable open dataset.

Sources & who's responsible:

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