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2021 Roblox Studio MCP Bridge

get_output_log

Fetches recent messages from the 2021 Roblox Studio output log to debug Luau scripts, track runtime errors, and monitor events.

Instructions

Retrieves recent messages from Studio's output log

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNoMaximum lines to retrieve (default: 50)

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?

With no annotations provided, the description carries the full behavioral burden and doesn't meet it. It doesn't say whether the log is consumed/cleared on read, the ordering of messages, how far back 'recent' reaches, or whether the call is side-effect free.

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?

One short, front-loaded sentence with zero filler. The verb-and-resource structure is immediately parseable.

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?

For a trivial one-optional-param read tool with full schema coverage, the description is minimally sufficient, but with no annotations and no output schema it could easily state ordering or recency semantics of the returned log lines.

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 single 'limit' parameter is fully documented in the schema (type, default, meaning), so the description need not add more. Baseline 3 is appropriate since the schema does the heavy lifting.

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 is clearly distinguishable from siblings like read_script, get_tree, or execute_luau. It stops short of any explicit sibling differentiation, so a 4 rather than a 5.

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?

There is no guidance on when to reach for this tool versus alternatives, no note on prerequisites (e.g., that it reads console output rather than script source), and no exclusions. The agent must infer the usage context entirely.

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