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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered; the description adds real substance beyond that — that the county-change route includes the filing being handled for the customer, what the price covers, and that borough aliases are accepted. It stops short of stating freshness of pricing or any rate/quote caveats, 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?

Front-loaded with the core outcome, then pricing routes, then the routing rule. The middle sentences are dense and slightly run-on, but every sentence carries either scope, behavior, or routing information.

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?

No output schema exists, and the description does address what comes back ('with what the price includes'). For a 3-parameter read-only pricing lookup that is close to sufficient; only price freshness/validity is left unaddressed.

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%, so the baseline is 3, but the description adds meaning the schema does not: that the two priced routes hinge on the county argument, that compare_to is a second county used for comparison, and that borough names (Brooklyn, Staten Island) are accepted even though they are not counties.

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 ... all-in price to complete New York LLC publication') with the scope narrowed to a county and LLC type. It explicitly separates itself from lookup_new_york_llc, so an agent can route without opening either 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 an explicit positive trigger ('Use for any cost question') and an explicit exclusion with the alternative named ('If the user names a specific LLC, use lookup_new_york_llc instead'). The two pricing routes are also described as conditions, not just outputs.

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