vroid_launch

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

With no annotations provided, the description fully carries behavioral disclosure. It details idempotency, window parking on workspace 9, focusing and fullscreening, blocking behavior, cold start timing, and the caveat that the start screen may not be ready. This is comprehensive for a launch tool.

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 concise and logically sequenced: purpose first, then idempotency, workspace details, and timing caveat. Each sentence adds necessary information without fluff. Slightly longer than minimal but justified by the behavioral details.

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?

Given no annotations and an output schema present, the description covers essential launch behavior, blocking, and post-launch guidance. It does not explicitly state return values, but the output schema likely handles that. It also does not mention error handling, but that is not critical for a launcher.

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 coverage is 100% and both parameters have descriptive schema entries (restart warns about unsaved work, timeout defines wait). The description adds context around restart via idempotency but does not materially extend parameter meaning beyond the schema. Baseline 3 is appropriate.

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 opens with a specific verb and resource: 'Start VRoid Studio (Steam appid 1486350, Proton) and take control of it.' It distinguishes itself from siblings by describing idempotent behavior and workspace parking, making it clear this is the launcher, not any other action.

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?

The description gives explicit context: it can be reused if window exists, blocks for 30-90s on cold start, and instructs to take a screenshot before clicking. It names vroid_release as complementary, implying when not to use (though it does not explicitly exclude other tools). The guidance is clear and actionable, though slightly implicit about alternatives.

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