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

With no annotations provided, the description must fully disclose behavioral traits, but it provides none. The name 'st-pa' and description 'USPS state code PA' suggest a static lookup, yet the input schema allows many varied inputs (URLs, city names, IANA zones, JSON text) that hint at complex validation or transformation. The description neither explains this behavior nor warns about potential side effects (e.g., discarded values).

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 (one phrase), which could be seen as concise, but it's under-specified rather than efficiently informative. There is no structural issue like front-loading, but the lack of any substantive content means the conciseness is not earning its place; it's just minimal.

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 is highly complex with 9 diverse parameters and no output schema, yet the description does not explain its purpose, behavior, return values, or relationship to siblings. The schema descriptions hint at validation/normalization tasks, but the name and description mislead an agent into thinking it's a simple state-code constant. This is grossly inadequate for a 9-parameter 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 schema already documents each of the 9 parameters with descriptions (coverage 100%), so the baseline is 3. The description 'USPS state code PA' adds no additional meaning about how the parameters are used; it doesn't clarify which parameter interacts with the state code or how the tool processes them. It fails to add value beyond the schema.

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 PA' is a tautology of the name 'st-pa' and does not state what the tool actually does. It does not describe any action or resource it operates on, making it impossible for an agent to know what function to expect. It also fails to distinguish itself from the 29 sibling tools, all of which have similarly obscure names.

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 versus any of the siblings. The description and name only hint at a state code, but the tool takes 9 unrelated parameters (ref, url, city, feed, host, json, path, zone, query), suggesting it is a multi-purpose validator rather than a simple state lookup. No context is provided for when to invoke this tool.

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