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

No annotations are provided, so the description must carry the full behavioral disclosure burden. It only notes that the body is discarded, which implies no persistence, but it does not explain the return value, error handling, or what happens to the nine optional parameters. This is a significant gap for a validation tool without annotations or an output schema.

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 a single, concise sentence that front-loads the key action and the side-effect fact. It wastes no words and is well structured for a straightforward validation tool.

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?

With 9 optional parameters, no output schema, and no annotations, the description is insufficiently complete. It does not clarify which parameter to pass as the body, what the result looks like, or how the many other parameters relate to the validation. The agent must rely entirely on the schema for these details, which the description fails to consolidate.

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 schema has 100% description coverage for all 9 parameters, so the baseline is 3. The description adds no additional parameter meaning and even introduces ambiguity by using 'body' rather than the schema's 'json' field. The parameter descriptions in the schema carry the actual semantic weight.

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 clearly states the tool's purpose: checking whether a body is valid JSON, with the verb 'check' and the resource 'body'. However, it does not explicitly differentiate itself from the sibling shape-check tools like domain-shape or file-path-ok, so it is clear but lacks sibling differentiation.

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 or when to prefer an alternative. There is no mention of conditions, prerequisites, or sibling tools, leaving the agent without routing information.

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