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

With no annotations, the description carries the behavioral burden; it does disclose that the input is discarded, which signals a non-persistent side effect. However, it omits the return value, error behavior for invalid JSON, and whether any network side effects occur from the URL/feed/host parameters.

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?

Two short sentences, front-loaded with the core operation, and both sentences carry distinct information. There is no filler or repetition.

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 description is too sparse for a tool with seven optional-looking parameters and no output schema or annotations. It never explains why parameters like ref, url, city, feed, host, and path are relevant to validating a JSON body, nor what result the agent can expect.

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 every parameter with descriptions, so the tool description does not need to restate them; coverage is effectively 100%. The description adds no parameter-level nuance and even substitutes 'body' for the 'json' property, which could be ambiguous.

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 names a concrete action ('check') and resource ('body'), and the suffix 'The body is discarded' clarifies this is a pure validation operation. It is distinguishable from sibling validators by focusing specifically on JSON syntax, though the term 'body' is vaguer than the actual 'json' parameter.

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 choose validate-json over sibling validation tools such as domain-shape, github-repo-shape, or file-path-ok. The description does not mention alternatives, exclusions, or use cases beyond the generic validation.

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