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

Annotations already declare readOnlyHint=true, idempotentHint=true, and openWorldHint=false, so safety is covered. The description adds genuine domain behavior beyond that: the county clerk designates the two newspapers, and in Manhattan/Brooklyn/Queens/the Bronx the clerk assigns newspapers per LLC rather than the list being fixed. It does not say what happens for an unrecognized county name, which keeps it from a 5.

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?

Return contents are front-loaded, followed by usage triggers and then exclusions, which is the right order. The borough list appears once as a parenthetical mapping and the NYC assignment rule is restated in the following sentence, a minor redundancy that costs it a point.

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?

With no output schema, the description carries the burden of describing return values and does so explicitly (newspapers, clerk contact, county mapping). Combined with the full routing guidance and single fully-documented parameter, an agent has everything needed to call this 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?

Schema coverage is 100% and the parameter description already lists example values, so the baseline is 3. The description earns extra credit by supplying the borough-to-county equivalence mapping (Manhattan=New York County, Brooklyn=Kings, Staten Island=Richmond), which tells the agent what values are semantically valid beyond the schema's examples.

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?

States a specific verb and resource ("Returns a county's publication details") and then enumerates the three return components: newspapers on the Comptroller's list, clerk contact info, and borough-to-county mapping. An agent can distinguish this from every sibling without opening the schema.

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?

Gives explicit when-to-use triggers ("which newspapers a county uses, how to reach the county clerk, or which county a borough is") and three explicit exclusions with named alternatives for pricing, requirements, and process steps. This is the strongest possible routing guidance.

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