List published Oracle counties

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 discloses that the tool returns every county, identifies the catalog as canonical, lists the included fields, and notes that placesTableUrl is nullable. This is strong transparency for a zero-parameter read-only list operation, though it does not mention sorting, pagination, or response size.

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 two sentences and every sentence earns its place. The first sentence states what the tool returns; the second sentence gives usage guidance. It is front-loaded with the core behavior and contains no filler.

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 zero-parameter, no-output-schema list tool, the description is complete. It explains what the returned data contains, mentions nullable fields, and provides a concrete use case. No additional context is needed for an agent to invoke this tool correctly.

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?

There are zero parameters, and schema coverage is 100% with no properties. The baseline for zero parameters is 4, and the description appropriately adds no parameter-specific semantics because none exist.

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 clearly states the tool returns every county in Oracle's canonical published-county catalog, enumerating the contained fields. It distinguishes itself from sibling tools by focusing specifically on the published-county catalog list, which none of the siblings do.

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?

The description explicitly says to use this tool to discover newly published counties and places availability instead of maintaining a hard-coded list. This gives the agent a clear decision rule for when this tool is appropriate, even though no sibling tool is named as an alternative.

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