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

No annotations are provided, and the description does not disclose side effects, return values, error behavior, or whether the operation is read-only. The phrase 'Values discarded' is ambiguous and could be interpreted as a side effect rather than simply ignoring values.

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 very short and avoids fluff, but it is under-specified to the point of being unactionable. It does not provide enough information to be considered well-structured for an agent.

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 tool has nine parameters, no required fields, no output schema, and no annotations, the description is severely incomplete. It does not explain input mapping, expected return format, or edge cases, making it impossible for an agent to use confidently.

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 description does not explain how any of the nine parameters relate to the stated purpose of counting keys. The schema descriptions are contradictory to the tool's purpose (e.g., 'Git ref name', 'URL to normalize', 'IANA timezone name') and do not clarify which parameter holds the JSON object.

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 the operation clearly ('Count keys in a JSON object') but does not specify which input parameter or schema field contains the JSON object. The input schema has nine unrelated string parameters with no required fields, so an agent cannot determine what to pass.

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?

The description gives no guidance on when to use this tool versus alternatives, no prerequisites, and no context about expected input. It does not mention any sibling tools or conditions that would make this the appropriate choice.

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