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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds the returned entity type (ИНН list) but says nothing about result volume or pagination — relevant for a daily nationwide registration listing that can be large — and adds no constraints beyond what annotations and schema provide.

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?

Two short sentences with zero padding; the core scope (date-registered ИП INNs) is front-loaded and the optional region filter follows immediately.

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 read-only, two-parameter listing tool with a fully documented schema, the description is adequate in scope but omits practical context an agent would want: whether results are paginated, roughly how many records to expect, and any date-range limitation. No output schema exists, so the return shape rests entirely on the single phrase 'Список ИНН'.

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 schema itself gives rich semantics, especially the region code explanation (КПП digits for organizations, ОГРНИП digits for ИП, not ИНН). The description only restates the region filter at a high level and contributes no additional parameter meaning, so baseline 3 is correct.

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 verb and resource: 'Список ИНН ИП, зарегистрированных в ЕГРИП за указанную дату' — the agent knows it retrieves INNs of sole proprietors registered on a date. It implicitly separates itself from new_organizations by naming ИП/ЕГРИП, but it never names any sibling (e.g. updated_entrepreneurs, new_organizations) to sharpen the distinction.

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?

Usage is implied by the 'registered on the given date' scope, and the second sentence signals optional region filtering. However, there is no explicit when-to-use guidance and no routing against close siblings such as updated_entrepreneurs or new_organizations.

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