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2021 Roblox Studio MCP Bridge

get_output_log

Retrieve recent Roblox Studio output log messages to debug Luau scripts or monitor errors. Set the limit parameter to control how many entries return.

Instructions

Retrieves recent messages from Studio's output log

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv1.5.6
    • removedInput schema / properties / limit / description
      Removed value: -"Maximum lines to retrieve (default: 50)"
  2. First observedv1.0.0

TDQS

C2.8/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full behavioral burden. 'Recent messages' hints at a scoped window, but nothing is said about ordering, pagination, whether it is read-only, or what happens when the log is empty — gaps that matter for a log retrieval tool.

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?

A single front-loaded sentence with no filler. It is efficient, though the extreme brevity leaves room for a clause of useful context that would not have hurt readability.

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?

The tool is simple (one optional parameter, no output schema, no annotations), so minimal description is defensible. Still, with no annotation coverage and no parameter documentation, an agent lacks enough to know scope, ordering, or how the limit is applied, leaving it only minimally viable.

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

Parameters2/5

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

Schema description coverage is 0% and the single 'limit' parameter (default 50) is never mentioned in the description. Despite 'limit' being fairly intuitive, the description adds no meaning about what it bounds or how it affects results, so it fails to compensate for the coverage gap.

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?

States a specific verb (retrieves) and resource (Studio's output log), which distinguishes it from siblings like get_tree, read_script, and script_grep. It is clear what the tool returns, though it does not explicitly name a sibling it is not.

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?

Provides no guidance on when to use this versus alternatives such as script_grep or read_script for debugging output. The reader must infer usage entirely from the name and resource.

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