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

No annotations are provided, so the description must carry the full behavioral burden. 'Input discarded' hints at a side-effect-free or non-persistent operation, but the description does not say what is returned, what a success or failure looks like, or whether any input is actually validated in a meaningful way.

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 only five words, but it is cryptic rather than economical. It is under-specified for a nine-parameter tool, and the first phrase, 'TIS-620 byte band,' is not front-loaded with an understandable 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?

With nine optional string parameters, no annotations, and no output schema, the description is far too sparse. It does not explain the relationship between TIS-620 byte validation and parameters such as ref, url, city, feed, host, json, path, zone, and query.

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?

Schema description coverage is 100%, so the schema already documents all nine parameters. The description adds no additional parameter meaning beyond restating that input is discarded, which yields the baseline score of 3 for high schema coverage.

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 names a domain term, TIS-620, but does not state a clear verb or resource. 'Byte band' is opaque, and 'input discarded' does not describe what the tool does or how it differs from sibling validators such as browser-url-ok or validate-json.

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 use this tool, when not to use it, or which alternatives exist. The description gives no context for selecting it over the many sibling shape-check and validator tools.

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