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

With no annotations, the description carries the full burden, and it does disclose the interaction model (user types a sentence) and the observable outcome (WPM and accuracy reported). It does not cover whether state persists, whether results are stored, or how the card is triggered, but for a lightweight self-contained card this is adequate context.

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?

Two compact sentences, front-loaded with the tool's identity before the mechanics. Nothing is wasted, though the second sentence could have carried the locale information at no cost to length.

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?

The description covers the interaction and return values, which is the right emphasis given there is no output schema. However, with no annotations and an undocumented locale parameter that changes the test's language, it falls short of being fully complete for invocation.

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 0% and the description never mentions the sole parameter, locale. The enum values en/zh are self-explanatory in the schema, but the agent gets no explanation of what the locale controls (presumably the language of the prompt sentence), so the description does not compensate for the coverage gap.

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 names a specific verb+resource combination ('interactive typing-speed test card') and states what it produces (WPM and accuracy), so an agent can tell it apart from neighbors like reaction-test or quiz. It stops short of explicitly contrasting itself with those siblings, but the purpose is unambiguous.

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?

There is no statement of when to use this tool versus the many other interactive test cards in the sibling list (reaction-test, quiz, password-strength). Usage is only implied by the phrase 'interactive typing-speed test card,' with no prerequisites, exclusions, or alternatives named.

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