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

Annotations already declare readOnlyHint=true, openWorldHint=true, destructiveHint=false, so the safety profile is covered. The description adds one genuinely useful behavioral clarification (the date is the extract date, not the registration date), but says nothing about result size, pagination, or ordering of the returned INN list.

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 tight sentence with the scope and the date-semantics caveat front-loaded; every clause carries information and nothing is 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?

For a simple read-only list endpoint with two fully documented parameters and no output schema, the description covers what the tool returns and the key date caveat. It is close to complete, with only the contrast against the 'new' siblings left to inference.

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 region semantics (2-digit code, КПП digits for orgs, ОГРНИП digits for ИП, default all regions) are fully documented in the schema. The description only restates that region filtering is optional, adding no meaning beyond the structured fields.

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 resource and scope: a list of ИП INN whose ЕГРИП extract changed on a given date, and usefully clarifies that the date is the extract date, not the registration date. It never names the sibling it contrasts with (new_entrepreneurs, updated_organizations), so an agent must infer 'updated' vs 'new' from the wording alone.

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 mentions that results can be filtered by region, which implies how to narrow a call, but gives no explicit when-to-use / when-not-to-use guidance and does not route the agent to new_entrepreneurs or updated_organizations.

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