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 disclosure. It reveals the shape of returned fields (source URL and statute) but says nothing about read-only semantics, result ordering, whether all counties are returned or only those with statutes, or how missing data is handled.

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?

It is a single short fragment with zero padding, which is efficient, but the terseness crosses into under-specification rather than disciplined conciseness. There is no structure beyond a noun phrase.

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?

For a simple one-parameter lookup with no output schema and no annotations, the description covers the essential fact an agent needs: what entity is returned and which accompanying fields. The gaps are secondary (error behavior, coverage completeness) rather than blocking.

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 single parameter is fully documented in the schema as a two-letter state code with an example, so the schema does the heavy lifting. The description adds no further meaning about the parameter (e.g. behavior for unknown codes or whether DC/territories are valid) beyond what the schema already states.

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 the resource (counties) and the scope (within a state), which distinguishes it from list_states, but it is a bare noun phrase with no verb, leaving whether it lists, looks up, or filters counties to inference. The stated return fields (source URL and statute) hint at the operation, but the purpose is never asserted explicitly.

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 when-to-use guidance, no mention of related tools such as list_states, and no prerequisites or constraints (e.g. what happens with an invalid or unsupported state code). The agent is left to infer usage context entirely.

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