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

No annotations are provided, so the description must carry the full burden. It does disclose that processing happens in the browser and that credits are consumed, but it doesn't explain what happens to the input file, whether the original is preserved, what output is produced, or any file/size constraints.

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 first sentence is front-loaded and clear, but the remaining sentences are dominated by credit/workspace business details rather than operational tool behavior. It is readable but not optimally concise for an agent.

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?

Even for a no-parameter tool, the description fails to explain how the audio input is provided, what speed range is supported, or what the output is. The pricing information is thorough, but the operational usage is under-specified.

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?

The input schema has zero parameters and 100% schema_description_coverage, so the baseline is 4. The description adds no parameter details, but no parameters exist to document; the core function is clearly stated.

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 and resource: 'Change audio playback speed without pitch distortion.' This distinguishes it from video speed tools and other audio processing siblings, though it doesn't explicitly name alternatives.

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 purpose statement implies when to use the tool (when audio speed needs changing), and the credit/workspace details provide usage constraints such as Day Pass exclusion and limited welcome credits. However, it doesn't explicitly discuss when to use this tool over sibling tools like mio_video_speed or mio_audio_denoise.

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