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

The description discloses that the body is discarded, but does not mention other potential side effects such as network requests, URL handling, or timezone interactions that the schema parameters imply. The behavior is under-specified.

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 to the point, but it sacrifices necessary detail. It is concise but not sufficiently informative to resolve the ambiguity created by the schema mismatch.

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 lacks an output schema, examples, or additional context. The description and schema are contradictory, and the tool cannot be used reliably without further clarification on how the parameters relate to the stated purpose.

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 every parameter has a description, the descriptions are inconsistent with the tool's purpose (e.g., 'url' is described as 'HTTPS URL to normalize or cite' and 'zone' as 'IANA timezone name'). Only 'json' aligns with the stated purpose, leaving the other parameters unexplained and confusing.

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 action (check if a body is valid JSON, discard it), but does not clarify what 'body' refers to. The input schema includes unrelated parameters (url, host, zone), making the tool's actual purpose 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?

No guidance is provided on when to use this tool versus alternatives. The sibling tools suggest overlapping functionality (e.g., normalize-url, status-catalog), but no differentiation is offered.

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