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

With no annotations, the description carries the full burden but only discloses that the body is discarded. It does not mention return behavior, error handling, or even that the 'path' parameter performs no disk access, leaving important operational behavior invisible.

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 minimal and front-loaded: the primary action appears first, and the second sentence adds a concrete side-effect clue with zero filler. It is appropriately brief for a simple validator, though slightly under-specified.

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 9 optional parameters and no output schema, the description does not explain which parameter to provide or what the tool returns when the body is valid or invalid. The schema compensates somewhat, but the agent cannot confidently decide how to invoke the tool.

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 documents all 9 parameters with 100% coverage, including 'json' as the JSON text to validate. The description therefore adds no disambiguating meaning about which parameter is the body or how the params relate to the check, earning only the schema-coverage baseline.

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 core action—check whether a body is valid JSON—which distinguishes it from sibling URL/path/shape checkers. However, it does not specify which of the many parameters is 'the body', leaving the exact resource 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?

There is no guidance on when to call validate-json versus a sibling tool, which parameter(s) are appropriate, or what conditions select this tool. The only hint is that the body is discarded, which implies a validation-only call but does not direct the agent.

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