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Roblox Executor MCP Server

Roblox Executor MCP Server

by okenjioxx
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

Check whether the current call originates from the executor

check-caller
Read-onlyIdempotent

Probe the active Roblox executor thread to confirm whether a direct MCP invocation is detected, helping verify behavior before installing a hook.

Instructions

Call Volt checkcaller in the active executor thread. This normally reports true for a direct MCP call and is most useful as a capability/behavior probe before installing a hook. Signature: { threadContext: number? }. Phase: observe; cost=medium; idempotency=read-only. Requires: active-client. Produces: structured-observation, operation-receipt. Safety: read-only. On failure: inspect tool-schema for exact fields, defaults, constraints, and an invocation example.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "check-caller"
  }
}

Input Schema

NameRequiredDescriptionDefault
threadContextNoOptional Roblox thread identity for this call; omit it to use the server default.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv2.0.0-spies.2

TDQS

A3.9/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare read-only, idempotent, non-destructive behavior, so the description adds useful context beyond that: active-client requirement, medium cost, produced artifacts, and failure guidance pointing to tool-schema. It does repeat the read-only annotation, which slightly limits its added value.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The purpose is front-loaded and the remaining operational details are compactly presented. Some fields (signature, idempotency=read-only, Safety: read-only) are redundant with structured data, but the text is not bloated.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple one-parameter probe with rich annotations and no output schema, the description covers requirements, outputs, cost, and failure handling. However, the produced observation ('structured-observation, operation-receipt') is vague and the return value is only implied by 'normally reports true.'

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, and the schema already documents threadContext as an optional Roblox thread identity with default behavior. The description only restates the signature without adding any semantic meaning beyond what the schema provides, so baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource: calling Volt checkcaller to determine whether the current call originates from the executor. It clearly distinguishes the probe's behavior ('normally reports true for a direct MCP call'), though it does not name a sibling alternative to contrast with.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives clear usage context: 'most useful as a capability/behavior probe before installing a hook.' This tells the agent when the tool is appropriate, but provides no explicit exclusions or alternative tools for different conditions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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