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

The description notes that the query is 'discarded', giving a hint about data handling. However, it does not disclose behavior regarding the other parameters, whether network requests are made, or any side effects. With no annotations, this transparency is insufficient.

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 concise, consisting of two short sentences. It is well-structured and free of unnecessary content, achieving high efficiency.

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 complexity of 9 parameters, the description is grossly incomplete. It provides no context on why the tool accepts many unrelated fields (e.g., url, city, timezone) or how they relate to counting characters in a query. An agent would struggle to determine proper usage or expected behavior.

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 100%, so parameter descriptions are already provided. The tool description adds no extra semantic meaning beyond mentioning 'query', which aligns with the schema. It does not clarify whether other parameters are ignored or affect the result.

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 tool's function: count characters in a search query. The verb 'count characters' is specific and the resource 'search query' is unambiguous. However, it does not explicitly mention that other parameters are ignored, which could cause confusion given the schema has 9 fields.

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 usage guidance is provided. The description does not indicate when to use this tool versus alternatives like memory-key-count or hn-front-count, nor does it explain the relevance of the other schema parameters.

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