unity_uma_rebuild_global_library

THE RISK

High Risk

Rebuilding/repairing a global asset library triggers a reprocessing/reindexing operation in Unity. This is an Execute-category action as it runs an internal operation (rebuild/repair) that has side effects on the asset index state.

From the tool's definition 'Rebuild or repair the UMA Global Library (UMAAssetIndexer)'

Documented attack patterns abuse exactly the kind of access unity_uma_rebuild_global_library gives an agent:

HOW TO CONTROL UNITY_UMA_REBUILD_GLOBAL_LIBRARY

PolicyLayer is an MCP gateway — it sits between your AI agents and Unity MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for unity_uma_rebuild_global_library:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "unity_uma_rebuild_global_library": {
      "limits": [
        {
          "counter": "unity_uma_rebuild_global_library_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

unity_uma_rebuild_global_library stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Unity MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

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All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
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Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

What does the unity_uma_rebuild_global_library tool do? +

Rebuild or repair the UMA Global Library (UMAAssetIndexer). It is categorised as a Execute tool in the Unity MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on unity_uma_rebuild_global_library? +

Register the Unity MCP Server MCP server in PolicyLayer and add a rule for unity_uma_rebuild_global_library: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Unity MCP Server. Nothing to install.

What risk level is unity_uma_rebuild_global_library? +

unity_uma_rebuild_global_library is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit unity_uma_rebuild_global_library? +

Yes. Add a rate_limit block to the unity_uma_rebuild_global_library rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block unity_uma_rebuild_global_library completely? +

Set action: deny in the PolicyLayer policy for unity_uma_rebuild_global_library. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides unity_uma_rebuild_global_library? +

unity_uma_rebuild_global_library is provided by the Unity MCP Server MCP server (anklebreaker-studio/unity-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Unity MCP Server tool call.

Deterministic rules across all 324 Unity MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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// WHAT UNITY_UMA_REBUILD_GLOBAL_LIBRARY ON UNITY MCP SERVER DOES

// THE RISK

// HOW TO CONTROL UNITY_UMA_REBUILD_GLOBAL_LIBRARY

// EXPLORE