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

With no annotations, the description carries the full burden of behavior disclosure, but it reveals nothing about side effects, return values, or what is checked or discarded. The only behavioral hints live in the schema parameter descriptions, not in the tool description.

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 text is short but under-specified: five words do not form a full description and fail to earn their place. This is tautological brevity rather than effective structured conciseness.

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 has nine optional parameters, no output schema, no annotations, and a large sibling tool set; a minimal description cannot make its behavior or result handling complete enough for an agent. Critical details about which input to use, what 'OK' means as a result, and how to interpret the response are absent.

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 and the baseline is 3. The description adds no parameter meaning; its mention of a USPS state code does not map to any schema property, but it does not directly corrupt the schema's parameter documentation.

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 is a noun fragment, 'USPS state code OK,' with no verb and no stated resource. It does not say what the tool does or how it differs from sibling ok/check tools. At best it names a token (Oklahoma's state code) rather than describing an operation.

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 about when to invoke st-ok versus sibling validators such as browser-url-ok, file-path-ok, or wiki-title-ok. No exclusions, prerequisites, or selection conditions are mentioned.

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