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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does disclose one useful behavior ('The body is discarded'), but it does not clarify whether all other schema fields (url, city, feed, host, ref, path) are ignored, what the return value looks like, or whether any 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?

The description is very short and front-loads the core action, with no filler. It could be slightly improved by naming the 'json' parameter, but as-is it is efficient and easy to scan.

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 seven parameters, no annotations, and no output schema, this description is too sparse. It does not explain how 'body' maps to the 'json' parameter, what the tool returns, why unrelated-looking fields exist, or how it should be used in context.

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 input schema already documents all seven parameters with descriptions, so the description does not need to repeat parameter details. However, the description uses 'body' while the schema calls the relevant field 'json', which is a minor ambiguity; no parameter meaning is added beyond the schema.

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 verb ('check') and a resource ('a body' as JSON), so the core purpose is clear and matches the tool name. It does not differentiate this validator from sibling validation tools like domain-shape or file-path-ok, but the basic purpose is unambiguous.

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?

There is no guidance on when to use this tool versus the many sibling tools, nor any mention of exclusions or prerequisites. A sentence like 'Use this when you need to verify JSON syntax; for URL/hostname shape, use normalize-url/domain-shape' would be needed.

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