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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds genuine value beyond that by disclosing the response shape: numbered steps plus a link to a short video, which is not in any structured field.

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?

A single tight sentence with no filler, front-loaded with the deliverable ('step by step') and followed by the scope and video link. Nothing is redundant, though it is thin enough that a little more guidance would have fit.

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 one-parameter, read-only lookup with no output schema, the description covers what it returns and for which platforms, which is what an agent needs to invoke it correctly. The remaining gap is routing guidance against informational siblings, a minor omission at this complexity.

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 the enum already spells out each task value in detail, including the Windows-only note for 'post'. The description adds only the constraint that a call covers one task at a time and that both Windows and Android are supported, so the baseline of 3 applies.

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 states a specific verb and resource: returns step-by-step instructions for one Wuai task, plus a short video link. That distinguishes it from informational siblings like get_faq, about_snagcast, or whats_new, though it never names them explicitly.

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?

Usage is only implied by the phrase 'how to do one thing' — an agent can infer this is for 'how do I...' questions, but there is no explicit when-to-use, when-not, or routing to get_faq for conceptual questions versus step-by-step procedures.

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