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Muhammad-Tanvirul-Islam-Shayeem

Roblox-MCP

by Muhammad-Tanvirul-Islam-Shayeem
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TypeScript
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Get data by code

get-data-by-code

Execute Luau code in the active Roblox client to retrieve raw Lua values. The code must return values; serialization is handled automatically.

Instructions

Execute Luau in the active Roblox client and return serialized raw Lua values. The code must return values; do not manually JSON-encode them.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
codeYesThe code to execute in the Roblox Game Client (MUST return one or more values). Return raw Lua values - do NOT manually serialize tables or use JSONEncode, the connector handles serialization automatically.
timeoutNoTimeout in milliseconds for the response (default: 15000, max: 120000). Increase for long-running operations like decompiling many modules.
threadContextNoThe thread identity to execute the code in (default: 8, normal game scripts run on 2)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.3/5.0
Behavior2/5

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

With no annotations, the description bears full burden for behavioral traits. It does not mention safety, side effects, error handling, or the potential for client crashes or state mutation. The description lacks warnings about executing arbitrary code.

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

Conciseness5/5

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

Two sentences with the first sentence front-loading the primary purpose. No wasted words; every sentence earns its place.

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

Completeness3/5

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

Adequate for a straightforward execution tool but missing details on return format (serialized raw Lua values) and error behavior. No output schema further increases need for completeness.

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%, so baseline is 3. The description adds marginal value by stating the execution context and serialization rule, but the schema already documents parameters thoroughly. No additional meaning beyond schema.

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

Purpose5/5

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

The description clearly states the verb (execute Luau), resource (active Roblox client), and outcome (return serialized values). It distinguishes from siblings like 'execute' and 'execute-file' by specifying Luau execution and serialized return.

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

Usage Guidelines2/5

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

No explicit guidance on when to use this tool versus alternatives like 'execute'. The only constraint is 'code must return values; do not manually JSON-encode', but no context on appropriate use cases or exclusions.

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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