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

No annotations are present. The description discloses that values are discarded but does not mention side effects, error behavior, or whether the operation is read-only or network-free.

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?

Description is a single concise sentence with no filler; it is immediately understandable.

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 tool has 9 optional parameters and no output schema; the description does not specify which parameter is used, how nested keys are treated, or what is returned (e.g., integer count, errors on invalid JSON).

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 descriptions cover 100% of parameters and are individually readable, but several (zone, query, feed) are unrelated to counting keys and no parameter is identified as the JSON object to inspect. The descriptions do not meaningfully connect to the tool purpose.

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?

States a clear purpose: count keys in a JSON object and discard values. The verb and resource are specific, but it does not identify which input parameter holds the JSON object or distinguish explicitly from validate-json.

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 guidance on when to use this tool versus sibling tools such as validate-json. It only states what it does, not when to choose it.

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