eval-expression

Evaluate ONE Luau expression on the active client and return its typeof plus an encoded value.

SERVERExecutor Mcp Roblox SOURCEokenjioxx/executor-mcp-roblox

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/executor-mcp-roblox/eval-expression.md

WHAT IT DOES

What eval-expression does on Executor Mcp Roblox

AI agents call eval-expression to retrieve information from Executor Mcp Roblox without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why eval-expression is rated Low

Even though eval-expression only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs eval-expression safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Executor Mcp Roblox, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For eval-expression, this is the rule to start with:

eval-expression Allowed

eval-expression is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "eval-expression": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Executor Mcp Roblox, apply this rule, and every eval-expression call is checked against it from then on.

FAQ

Questions about eval-expression

What does the eval-expression tool do? +

Evaluate ONE Luau expression on the active client and return its typeof plus an encoded value. It is categorised as a Read tool in the Executor Mcp Roblox MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on eval-expression? +

Register the Executor Mcp Roblox MCP server in PolicyLayer and add a rule for eval-expression: 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 Executor Mcp Roblox. Nothing to install.

What risk level is eval-expression? +

eval-expression is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit eval-expression? +

Yes. Add a rate_limit block to the eval-expression 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 eval-expression completely? +

Set action: deny in the PolicyLayer policy for eval-expression. 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 eval-expression? +

eval-expression is provided by the Executor Mcp Roblox MCP server (okenjioxx/executor-mcp-roblox). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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