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

The description does disclose that the query is discarded, which is a useful side-effect note. However, with no annotations, it does not clarify that the other eight listed parameters are ignored or that no external side effects occur.

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?

At just two short sentences, the description is extremely concise and every word adds information. It states the action and the disposal of the query without padding.

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?

With nine optional parameters and no output schema, the description does not fully equip an agent to invoke the tool. It does not state the return type, how other parameters are treated, or what happens when no query is provided.

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 schema already documents all parameters, so the description does not need to repeat them. It does point to 'search query' as the relevant input, though the presence of many unrelated parameters in the schema remains confusing.

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—count characters in a search query—so an agent can grasp the tool's core purpose. It does not explicitly distinguish from sibling tools, but the verb and object are clear enough.

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 given for when to use this tool versus alternatives, nor how the query should be supplied. The only additional note is that the query is discarded, which is more about side effects than usage direction.

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