Trigger Verse compilation and return build status with any errors.
AI agents invoke verse_build to trigger actions in Uefn. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
Verse is Unreal Editor for Fortnite's scripting language. Triggering compilation is an Execute action—it runs code (the Verse compiler) and has side effects that depend on what code is present in the editor. While compilation itself is not inherently destructive, it executes external operations and could expose vulnerabilities if an agent compiles malicious Verse code.
From the tool's definition Trigger Verse compilation and return build status with any errors. The word "trigger" indicates initiation of an external operation (Verse compiler), whose effects depend on the code being compiled.
Documented attack patterns abuse exactly the kind of access verse_build gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Uefn, and nothing reaches the server without passing your rules. This is the rule we recommend for verse_build:
{
"version": "1",
"default": "deny",
"tools": {
"verse_build": {
"limits": [
{
"counter": "verse_build_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}verse_build 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.
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Trigger Verse compilation and return build status with any errors. It is categorised as a Execute tool in the Uefn MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Uefn MCP server in PolicyLayer and add a rule for verse_build: 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 Uefn. Nothing to install.
verse_build is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the verse_build 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.
Set action: deny in the PolicyLayer policy for verse_build. 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.
verse_build is provided by the Uefn MCP server (quangdang46/uefn-verse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Uefn, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
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