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

The description reveals only that the body is discarded, implying no persistent side effects, but it does not explain what happens with invalid JSON, return format, error behavior, or whether other parameter values affect validation. With no annotations, much behavioral information 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?

The description is very short and front-loaded with the core purpose. It avoids extraneous detail and wasted words, making it appropriately sized for a simple validate action.

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 description is incomplete for the tool's complexity. It does not explain what 'body' refers to, how the 9 parameters should be used, what output the caller should expect, or how validation errors are reported. An agent would struggle to invoke it correctly.

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?

Although 100% of schema parameters have descriptions, those descriptions are generic and largely irrelevant to JSON validation (e.g., city name, timezone, search text). The tool description adds no parameter guidance, and the schema descriptions do not clarify how parameters relate to the stated purpose.

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 statement 'Check whether a body is valid JSON' gives a clear action and target, but 'body' is ambiguous and the tool's 9 unrelated parameters do not clarify what body or JSON input is expected. It does not distinguish itself from sibling validation tools.

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?

No guidance is provided about when to use this tool instead of sibling validators like file-path-ok, browser-url-ok, or jira-key-shape. The description does not mention use cases, prerequisites, or alternatives.

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