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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and closed-world, so the safety profile is fully covered. The description adds one genuinely new behavioral fact, that the tool is free, which is useful for routing, but says nothing about response shape, pagination, or freshness of the price data.

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?

Two short sentences with no filler, and the subject (price and scope of the C-10 check) is front-loaded. The trailing 'This tool is free' is short and useful, though it could be folded into a more informative routing statement.

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 parameters and an output schema present, the description need not explain return values. It covers the one thing an agent needs to choose this tool: that it yields C-10 price/scope information at no cost. The unresolved overlap with check_c10_license is the main remaining gap.

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 tool takes zero parameters, so there is nothing for the description to disambiguate; baseline 4 applies. It correctly implies no input is needed to see the C-10 check pricing.

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 concrete verb and resource ('Show the price and scope of the California C-10 check'), so the agent knows it returns pricing/scope data rather than license status. It does not, however, explain how it differs from the sibling check_c10_license, and the plural name ('check prices') sits awkwardly against the description's single C-10 scope.

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 only usage signal is 'This tool is free', which hints at a cost-driven reason to prefer it, but there is no explicit when-to-use, when-not-to-use, or reference to the sibling check_c10_license. The agent must infer the relationship between the two tools on its own.

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