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

The description explicitly states that the body is discarded, indicating a non-persistent, read-only operation. However, it does not clarify whether the tool has any side effects (e.g., logging) or permissions requirements, and no annotations are provided to fill this gap.

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 extremely concise, consisting of two short sentences with no redundant information. It is well-structured and easy to read.

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 an agent to correctly invoke the tool. It does not specify which parameter represents the JSON input, nor does it explain the expected output (e.g., validation result format). It lacks context about the tool's purpose beyond the literal check.

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 the schema has full descriptions for all parameters (100% coverage), the description adds no value and instead introduces confusion by using 'body' instead of pointing to the 'json' parameter. It does not clarify which of the nine parameters is relevant for the intended operation.

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 clear verb (check) and resource (JSON validity), but refers to a 'body' that does not correspond to any parameter in the schema. The presence of a 'json' parameter is not indicated, leaving the intended input ambiguous.

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 provides no guidance on when to use this tool over the many sibling tools (e.g., other validation tools). It does not mention any conditions, contexts, or alternatives.

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