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

No annotations are provided, so the description carries the behavioral burden. It does disclose the 3¢ per-call cost, which is useful operational context, but it does not explicitly state that the operation is read-only or describe any rate limits or failure behavior.

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 description is compact and front-loads the core purpose followed by pricing, with no filler. It is appropriately concise for a simple tool, but it is sparse enough that some information is missing rather than merely condensed.

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?

Given the tool has one obvious parameter and an output schema, the description covers the essential purpose and cost. However, it lacks usage guidance and any behavioral caveats, so it is adequate but not fully complete for confident tool selection.

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 sole parameter sa4_name has no schema-level description (0% coverage) and the description adds no detail about accepted formats or how the name relates to the parent chain. The parameter is reasonably self-explanatory from its name, but the description adds no semantic value beyond the schema.

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 clearly states the tool's output: SA4's parent chain, composed of GCCSA and state. It is specific enough for an agent to know what data will be returned, though it lacks an explicit verb and does not distinguish itself from sibling profile tools.

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?

No guidance is given about when to use this tool versus alternatives like sa4_list, lga_profile, or suburbs_profile. The agent must infer usage from the name and the sibling list, which is insufficient in such a large tool family.

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