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Roblox Studio MCP Server

Roblox Studio MCP Server

by boshyxd
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
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mass_set_property

Set a single property on multiple instances simultaneously. Streamline workflows in Roblox Studio by applying batch property modifications with ease.

Instructions

Set the same property on multiple instances at once

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "paths": "<paths>",
      "propertyName": "<propertyName>",
      "propertyValue": "<propertyValue>"
    },
    "name": "mass_set_property"
  }
}

Input Schema

NameRequiredDescriptionDefault
pathsYesArray of instance paths to modify
propertyNameYesName of the property to set
propertyValueYesValue to set the property to (any type)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.1/5.0
Behavior2/5

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

No annotations are provided, so the description must disclose behavioral traits. It states it is a batch mutation but gives no information about atomicity, partial-failure behavior, permissions required, reversibility, or return values. This is a significant gap for a bulk write operation.

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 description is a single, concise sentence with no fluff or repetition. It efficiently conveys the core purpose, though it sacrifices detail for brevity. For a simple tool with a clear name, this is acceptable.

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

Completeness2/5

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

For a batch operation with no output schema and no annotations, the description is too sparse. It omits crucial context like error handling on individual paths, whether the operation is transactional, and what the return value indicates. This leaves the agent guessing about the tool's full behavior.

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 coverage is 100%, with descriptive names and types for all three parameters. The description adds little beyond the schema, merely rephrasing that the same property is applied to multiple instances. Baseline 3 is appropriate since the schema carries the semantic weight.

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 clearly states the action ('Set'), the resource ('property'), and the scope ('multiple instances'), which distinguishes it from single-instance 'set_property' and read-oriented 'mass_get_property'. It is specific and unambiguous, though it does not name the exact parameter semantics (e.g., using paths).

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

Usage Guidelines3/5

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

The description implies usage context: when you need to apply the same property value across multiple instances. However, it does not explicitly say when to prefer this over alternatives like 'set_property' (single) or mention any exclusions or prerequisites. This is minimal viable guidance.

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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