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

Annotations already cover readOnly/idempotent/non-destructive/openWorld, so the description is free to add higher-value context — and it does: freshness ('the date BackPR checked them'), provenance (source links, published copies of state law), completeness caveats ('facts BackPR couldn't confirm'), and a scope disclaimer. That is materially more than the annotations provide.

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-loads the core action and purpose in the first sentence, then adds when-to-use and the disclaimer. The opening sentence is long and comma-heavy with the topic list, but every sentence carries information that isn't restated elsewhere.

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?

An output schema exists so return-shape detail is optional, yet the description still sketches the return (sections, checked date, URL, source links, unconfirmed facts). Combined with annotation-covered safety, an agent has what it needs; the only real gap is distinguishing this from sibling tools like list_states_by_rule.

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 description coverage is 100% and the topic enum is fully documented in the schema, including all seven values. The description's list of rule areas mirrors the enum rather than adding new meaning (no syntax, aliasing, or default nuance beyond what the schema says). Baseline 3 applies.

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 ('Look up one US state's rules for youth programs') and enumerates the covered rule domains, so the agent knows exactly what comes back. The 'one US state' framing implicitly separates it from the sibling list_states_by_rule, but no sibling is named explicitly, so a 4 rather than 5.

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 a clear triggering scenario: 'Use it when someone asks what a state requires of a childcare center, camp or after-school program.' It also implicitly excludes legal-advice use via 'General information, not legal advice.' No named alternatives or explicit when-not beyond that, so not a 5.

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