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

With no annotations provided, the description carries the full burden of behavioral transparency. It fails to disclose what operations the tool performs, whether it accesses external resources, or what the output format is. The description is purely definitional and offers no behavioral information.

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 short, which is efficient in word count, but it is under-specified rather than concise. It lacks any functional content, so the brevity is not a virtue; it fails to earn its place because it provides zero actionable information.

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?

Given the tool has 9 parametersency, lacks an output schema, and sits among 29 siblings, the description is grossly incomplete. It does not explain how the tool works, what any parameter does in context, what it returns, or how it differs from alternatives. An agent has no way to correctly invoke this 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?

Although the schema description coverage is 100%, the description itself provides no additional meaning for any of the nine parameters. It does not even mention that parameters exist or hint at which ones are relevant. The agent cannot determine which parameter to use or how to construct a valid call.

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 'USPS state code MA.' is a tautology that merely restates the tool name 'st-ma' without indicating any action or purpose. It does not distinguish this tool from its 29 siblings, such as 'browser-url-ok' or 'validate-json', and provides no clue about what the tool does or how an agent might use it.

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 given on when to use this tool versus the many sibling tools. The description offers no context, prerequisites, or exclusions, leaving the agent to guess what inputs are appropriate and what the tool is for.

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