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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds useful provenance ('from Payotte's guides and their official sources') and clarifies that the scope is one rule across all states, but says nothing about output format or currency of the 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?

A single front-loaded sentence with the jurisdiction marker first and the topic scope immediately after; every clause carries information. Slightly dense parenthetical enumeration, but nothing is wasted.

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?

For a one-parameter, no-output-schema tool the description is nearly sufficient: it identifies the jurisdiction, the unit of comparison, the topic domain, and the data source. It omits only return-shape and freshness details, which are minor given the simple enum-driven input.

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 enum already enumerates all eight valid topics. The description merely repeats that same list, adding no syntax or interpretation beyond what the schema provides, so the baseline of 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 (compared) and resource (one property rule across Australian states and territories), and enumerates the eight comparable topics. The 'AUSTRALIA.' prefix implicitly separates it from compare_states_us/uk/in, but no sibling is named explicitly, so it stops short of a 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?

The description gives no when-to-use, when-not-to-use, or alternative routing. An agent must infer that this is the state-comparison tool versus the single-state tools (purchase_duty_au, guide_au) or the cross-country comparators purely from the name and topic list.

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