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

The description adds 'Consumes Wubble requests or credits', which aligns with the destructiveHint annotation and provides cost context. However, it does not detail side effects like asynchronous operation or required polling, which are beyond the annotations.

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 very concise at two sentences with no wasted words. However, it could benefit from slightly more detail without adding bulk.

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 the presence of an output schema, return values are covered, but the description omits critical context: the tool likely operates asynchronously (sibling wubble_wait_for_request suggests polling). No mention of request ID, processing time, or that this is a non-blocking operation.

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%, so the schema already fully describes parameters. The description adds no additional meaning to the prompt or lyrics fields, resulting in 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 clearly states the verb 'Generate' and resource 'Wubble song', distinguishing it from siblings like wubble_generate_instrumental or wubble_generate_lyrics. However, it does not elaborate on what constitutes a 'Wubble song' versus other generated audio types.

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 on when to use this tool over alternatives such as wubble_generate_instrumental or wubble_generate_lyrics. The mention of consuming requests/credits hints at cost but does not provide explicit usage context or exclusions.

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