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

With no annotations, the description must disclose behavioral traits. It states that 'the body is discarded', which communicates a non-retention behavior. However, it does not clarify side-effects (e.g., network calls), error handling for invalid JSON, or read-only status, and the term 'body' is not mapped to the schema's 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?

The description is concise with only two sentences and the main purpose is front-loaded. However, the second sentence adds marginal value beyond the schema's parameter descriptions, and the undefined 'body' term creates ambiguity that detracts from the clarity achieved by brevity.

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 8 parameters, no output schema, and no annotations, the description is under-specified. It does not explain which parameter holds the JSON to validate, what the tool returns (e.g., boolean, error), or how the other parameters relate to the validation, leaving an agent without enough context to invoke it correctly.

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 covers all 8 parameters with descriptions, so the schema already carries full parameter semantics. The description adds no new parameter-specific meaning; 'body' is not tied to any schema property, and the 'discarded' note mostly duplicates existing schema text.

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 gives a specific verb ('check') and a resource ('a body') with a clear success criterion ('valid JSON'). It differentiates from sibling shape validators (e.g., domain-shape, wiki-title-ok) by focusing on JSON content, though it does not name a sibling explicitly.

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 is provided on when to use this tool versus alternatives. The description does not mention any sibling tools, preconditions, or selection criteria, leaving the agent to infer usage solely from the tool name.

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