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

With no annotations, the description carries the transparency burden, but it only discloses that the query is discarded. It does not specify the return value, error behavior, or the fate of the many other accepted parameters, some of which have non-discard descriptions, creating confusion.

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 extremely short and front-loaded: two sentences, both informative. It could be slightly clearer about the parameter's disposal, but there is no redundancy or wasted text.

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 tool with nine optional parameters and no output schema, the description is too sparse. It omits the return format, does not explain the role of the unrelated parameters, and provides no guidance on selecting this tool over sibling tools. An agent would likely be unsure whether to supply any of the extra fields.

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?

Although every schema parameter has a description, several are unrelated to counting a query and are described with behaviors that suggest they do something (e.g., url 'normalize or cite', zone 'IANA timezone name'). The query parameter is clear, but the tool description adds no clarification about whether the other parameters are ignored, making the parameter list misleading.

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 action and target: 'Count characters in a search query.' This clearly conveys the primary purpose. The phrase 'Query discarded' adds slight ambiguity about whether the query itself is discarded or only the parameter after use.

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 when-to-use guidance is provided. The description does not mention alternatives, trade-offs, or conditions such as checking query length for API limits, nor does it reference related sibling tools.

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