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 important trait: 'The body is discarded,' which signals non-persistence. However, it does not state what happens on success or failure, whether a boolean/result is returned, or any error behavior.

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 and front-loaded: the validation purpose comes first, followed by the discard behavior. It wastes no words, though the term 'body' is slightly ambiguous against the actual parameter names.

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?

This is a 9-parameter tool with no output schema and no annotations, so the description needs to provide substantial context. It fails to explain which parameter is the JSON body, why the other parameters exist, what the tool returns, or how the agent should interpret the result. The definition is too thin for confident invocation.

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 description coverage is 100%, so the input schema already documents every parameter, including 'JSON text to validate; discarded after the check.' The description adds no parameter-level meaning and does not clarify which parameter corresponds to 'body,' but the schema compensates for most of that gap.

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 action ('Check whether') and a clear resource ('a body is valid JSON'), which distinguishes it from the sibling shape-checking tools like domain-shape or wiki-title-ok. It does not explicitly differentiate from sibling tools, but the core 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 about when to prefer this tool over any alternative, nor any mention of exclusions or prerequisites. The description simply states what the tool does, leaving the agent to infer usage context from the name and schema.

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