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

The annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the tool's safety profile is fully covered. The description adds only what the tool returns: regions, neighborhoods, and store counts. It adds nothing about ordering, sizes, or pagination, but with annotations covering the rest, that is a modest contribution.

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?

It is a single short sentence listing exactly the three things returned, with no filler or repetition of the title. It is front-loaded and ends without unnecessary padding.

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?

There is no output schema, so the description must say what comes back; it does, by naming regions, the neighborhood list, and store counts. The remaining gap is that it does not give the shape or ordering of the returned data, and that it does not explicitly position itself as the directory/coverage tool among restaurant-oriented siblings.

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 accepts zero parameters, and the description does not need to explain any parameter semantics. Baseline for a zero-parameter schema. Nothing in the description misrepresents an input.

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 names a specific resource and verb: it shows the regions covered, the neighborhood list, and store counts. That clearly separates it from the sibling tools, which all deal with individual restaurants or restaurant searches. However, it does not explicitly say that it is the reference/lookup tool rather than the restaurant-lookup tool.

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 guidance on when to call this tool or when to use a sibling instead. It contains no explicit cues such as 'use this to discover which regions are valid before calling find_restaurants_near', so the agent must infer the tool's role from its name and its Korean phrasing.

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