Roblox MCP

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

Without annotations, the description carries full burden but provides minimal behavioral disclosure. It mentions the [PRO] tier restriction, which is useful access control context. However, it fails to warn about side effects of playtest control actions (play/stop/inject scripts) or explain what 'automated test runner' entails regarding file system writes and execution risks.

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

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

The description is appropriately brief (two fragments) and front-loaded with the tool name. However, the structure is awkward—running together capabilities with inconsistent punctuation (colon vs. period) and bracket notation. Every word earns its place, but the telegraphic style harms readability.

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

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

For a 6-parameter tool with 12 distinct action modes—including script injection, playtest state mutation, and file writing—the description is inadequately thin. With no output schema and no annotations, the description should explain return values, error modes, and state implications of actions like 'run_test' which 'inject[s] test script' per the schema.

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

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

Schema description coverage is 100%, with comprehensive documentation for all 6 parameters (especially the complex 'action' enum with 12 modes). The description adds no parameter-specific guidance beyond the schema, warranting the baseline score.

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

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

The description lists specific capabilities (ping, connection, usage tier, place info, etc.) but fails to synthesize them into a coherent purpose. It presents a grab-bag of system operations without explaining why these belong together in one tool vs. siblings like workspace_state or manage_scripts. The 'System info' prefix is misleading since the tool includes mutating operations (play/stop/pause/resume).

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

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

No guidance provided on when to use this tool versus the 20+ sibling tools. For example, it doesn't clarify when to use 'services' action vs. query_instances, or 'studio_settings' vs. manage_properties. No mention of prerequisites, side effects, or workflow context.

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