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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered by structured data. The description adds little behavioral context beyond a 'not legal advice' caveat; it does not mention scope limits (e.g., US states only) or how exhaustive the rule matching is. With annotations doing the heavy lifting, a 3 is appropriate.

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 core mapping statement is front-loaded in a single dense sentence, with the disclaimer trailing it. Nothing is bloated, though the parenthetical enumeration is somewhat redundant against the schema's enum list and the disclaimer sits awkwardly in the same breath as the functional description.

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-value explanation is not needed, and the annotations cover the safety profile. What remains slightly thin is jurisdictional scope (the schema hints at US states/DC but the description never says it) and whether the two content inputs are combinable. For a read-only four-parameter checker, this is close to complete.

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 75%, so the schema already documents state, ad_text and elements, including the explicit note that omitting elements relies on ad_text alone. The description's parenthetical list (testimonials, past results, expert claims, actors, Spanish, AI) loosely mirrors the enum values but does not map cleanly to all ten enum members. response_format has no description in either place, leaving one gap.

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 states a specific operation — mapping an ad's content or text to the state lawyer-ad rules it implicates — with the resource ('one state's lawyer ad rules') clearly named. It is distinguishable from siblings like get_state_rules or search_rules by being a content-to-rule matcher rather than a rule lookup. It stops short of naming those siblings explicitly, so the differentiation is inferred rather than stated.

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 phrase 'from what it contains ... or its text' implies two input modes (declared elements vs. scanned ad copy), which is useful implied usage guidance. However, there is no explicit when-to-use guidance, no statement about when to prefer get_state_rules or get_ad_filing_requirements instead, and no guidance on whether ad_text and elements can be supplied together.

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