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

Annotations already establish readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds real value beyond that: a hard cap of 20 results, the exact fields returned (price, region, auction form, deadline, link), and the default ordering. It does not mention pagination or rate limits, keeping it from a 5.

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?

Three sentences, all substantive, with the scope and return contract front-loaded before the default-ordering note. No filler, though the middle sentence is somewhat list-like and could be tightened.

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?

With no output schema, the description usefully compensates by enumerating returned fields and the result cap. Combined with annotations covering the read-only nature and a fully documented 10-parameter schema, an agent has enough to invoke it correctly; only cross-parameter interaction guidance is missing.

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 5 of 10 parameters are enums, so the schema already documents every field, including defaults for 'sort' and 'limit'. The description adds no syntax, format, or interaction details (e.g. combining query with region/channel) beyond what the schema provides, so the 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 ('Ищет лоты в каталоге торгов имуществом в России') and enumerates the domains covered (bankruptcy, state property, arrested/collateral, commercial). It also names the returned fields. It does not, however, differentiate itself from the sibling tools 'search' or 'get_lot', so it falls short of a 5.

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 only implied: the default sort (nearest bid deadline) hints at the primary browse use case, but there is no explicit when-to-use-this-vs-alternatives guidance against 'search', 'get_lot', or 'market_stats'. Nothing tells the agent when this catalog search is the wrong choice.

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