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

There are no annotations, so the description carries the full behavioral burden. It only discloses that the body is discarded; it does not state what the tool returns, whether invalid JSON throws or returns a failure value, or how errors are surfaced. For a validation tool, the return/error contract is the central behavior and it is missing.

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 with no filler: the core purpose is front-loaded and the discard behavior is stated in a single clause. Every word earns its place.

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?

Despite a 9-parameter schema and no output schema, the description leaves return semantics completely unspecified and never reconciles the singular 'body' with the many schema fields. An agent can guess that `json` is the input, but it cannot know what a successful check returns or whether failure is an exception.

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 baseline is 3; each parameter already has a concrete description. The tool description adds only the generic word 'body,' which maps to the `json` parameter but does not clarify whether the other eight optional parameters are intentionally ignored.

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 the specific operation ('Check whether') and resource ('a body ... valid JSON'), and the JSON scope distinguishes it from sibling shape/ok tools such as domain-shape or browser-url-ok. The discard note reinforces that this is validation-only, not a transform or storage tool.

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 implies this is the tool to use when a JSON body needs a validity check, but it gives no explicit when-to-use/when-not-to-use guidance or alternatives. It does not say whether it handles only syntax validation or also schema validation, nor does it distinguish itself from related 'ok' and 'shape' siblings.

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