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

No annotations are provided, so the description must fully disclose behavior. It discloses that the body is 'discarded' (i.e., not retained), which is useful, but it omits other behavioral traits an agent might need, such as whether the tool makes network calls, requires auth, has side effects, or is a pure and safe read-only operation. The bare 'discarded' is not enough.

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 exactly two sentences: one stating the purpose, one stating the discard behavior. There is no filler, it is front-loaded with the primary verb, and every sentence adds information. This is the strong point of the definition.

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 tool accepts 9 optional parameters and has no output schema or annotations to clarify behavior. The description addresses only JSON validation and the discard behavior, not the purpose or semantics of the other eight fields, nor the return format/success criteria. It is not complete enough for an agent to confidently call it.

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 schema already documents all parameters. The description adds no extra parameter meaning beyond the schema; the word 'body' could map to `json` but is not explicitly tied to any parameter. Baseline 3 is appropriate.

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: check whether a body is valid JSON. It uses a specific verb ('check') and a specific resource ('JSON'), which matches the tool's name and the `json` parameter. It does not explicitly distinguish itself from sibling shape validators (e.g., `domain-shape`, `figma-url-shape`), but the JSON-focused intent is plain.

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 on when to use this tool versus alternatives. It does not say 'use for JSON validation' or 'use `validate-json` instead of `domain-shape` for URL checks.' The sibling tool names suggest related validators, but the description offers no direction.

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