unity-mcp
⚠ Stale — 204d agounity-mcp (MCP for Unity) is a Unity Editor extension that runs a local MCP/HTTP server on the user machine and exposes a rich set of “tools” and “resources” so AI assistants can inspect and modify Unity projects (assets, scenes, scripts, editor actions) and automate workflows.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Network exposure is fail-closed by default: local loopback-only binding for HTTP local, explicit opt-in required for LAN binding and for plain HTTP remote. README mentions telemetry is anonymous and privacy-focused with an opt-out. However, no user authentication/authorization model (tokens/scopes) is described for the MCP server, so security relies heavily on local-only access and network settings. Dependency/version/CVE status is not stated in the provided content.
⚡ Reliability
Best When
You want an AI-driven, local developer workflow where the Unity editor is already trusted and the AI is assisting with editor automation on the same machine.
Avoid When
You need multi-tenant or cross-user access, strong identity-based authorization, or fully unattended remote execution over untrusted networks.
Use Cases
- • Let an AI assistant create and edit Unity scenes (game objects, components, materials, textures)
- • Automate Unity editor tasks (builds, package management, menu actions, running tests)
- • Assist with script authoring and edits via code tools and optional Roslyn-based validation
- • Multi-instance Unity editor control by routing subsequent tool calls to a selected instance
- • Verifying Unity API usage by reflecting live C# APIs and fetching Unity documentation
Not For
- • Production remote control of Unity over the public internet without careful network hardening
- • Use cases requiring strong formal authentication/authorization between multiple users (it is local by default)
- • Environments where running arbitrary editor actions from an LLM tool layer is not acceptable
Interface
Authentication
README describes network defaults (fail-closed loopback by default; remote requires https and explicit opt-in for insecure/in-LAN binding) but does not describe user-level auth, tokens, or scopes.
Pricing
No direct pricing for unity-mcp is stated; sponsorship and Coplay products are mentioned separately, but unity-mcp itself is MIT.
Agent Metadata
Known Gotchas
- ⚠ Statefulness: many tools change the Unity project/scene; repeated calls may have compounding effects
- ⚠ Long-running operations exist (async job tracking/polling); agent may need to poll using provided job endpoints rather than immediately retrying
- ⚠ Multi-instance routing requires selecting the active instance (set_active_instance) before subsequent actions
Alternatives
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Scores are editorial opinions as of 2026-03-29.