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

With no annotations, the description carries the full burden. It explains what the report includes and its audience, but it does not explicitly state whether the operation is read-only, data source, freshness, or any potential side effects or limitations. This leaves some ambiguity about the tool's behavior beyond its basic purpose.

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 concise and well-structured: a one-sentence summary, a list of included content, audience guidance, and an args block. Every sentence adds value, with no redundant or fluff content.

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 only one parameter and an output schema, the description covers the essential context. It would benefit from noting that the region should be a valid/known region (e.g., from get_regions), but overall it provides sufficient guidance for typical use.

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 schema only defines 'region' as a required string with no description. The description's Args section adds meaningful guidance by labeling it as a region name and providing concrete examples ('Москва', 'Ленинградская область'), which compensates for the 0% schema description coverage.

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 uses a specific verb and resource: 'Generate a comprehensive market report for a specific region.' It further clarifies the report contents (market size, price tiers, top players, etc.), distinguishing it from sibling analytics tools and providing a clear, specific purpose.

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?

It gives clear target audience and use cases: 'Perfect for investors, business development, and market entry analysis.' This implies when to use the tool, though it does not explicitly mention alternatives or when not to use it, so it falls short of a 5.

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