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

No annotations are provided, so the description carries the full behavioral burden. It discloses that the body is discarded, which is useful, but it does not state the return value, whether validation errors are explained, or any additional side effects. This leaves behavior under-specified for an agent that needs to interpret the result.

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 primary behavior is front-loaded and the discard note is valuable. 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?

The schema is surprisingly broad with eight parameters and no output schema, yet the description gives no context for the unrelated-looking parameters and no explanation of what the caller should pass as the 'body.' An agent cannot confidently predict the response format or which parameter is the actual JSON input without deeper inspection.

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 already provides descriptions for all parameters, including 'json: JSON text to validate; discarded after the check,' so schema coverage is effectively complete. The description adds no parameter-level meaning beyond the schema and does not clarify why the other parameters like ref, url, city, feed, host, and path exist. The 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 states a specific verb ('check') and resource ('body') with a clear JSON focus, which distinguishes it from sibling shape/validation tools. It does not explicitly connect 'body' to the `json` parameter, so an agent must inspect the schema to map the description to the actual input.

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 use this tool versus alternatives such as domain-shape, file-path-ok, or wiki-title-ok. The description only implies the use case through the phrase 'valid JSON,' which is already obvious 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.