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

readOnlyHint=false already flags this as a mutation, so the description only needs to add context — and it does, disclosing the restriction that only items on Kalita's list are accepted and that a price lookup precedes the sale. It does not say whether the sale is reversible, what happens if the item is not on the list, or what a failed attempt returns.

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 compact sentence with the action front-loaded and the constraint appended. Slight loss for the terse 'сначала его цена, потом продажа' clause, which is ambiguous about whether the price call is mandatory or merely descriptive.

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 one-parameter mutation with no output schema, the definition covers purpose, the accepted-item restriction, and the two-step flow. The main remaining gap is the unstated dependency on the Kalita dialog being open and on how to discover the item id.

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 0% for the single item_id parameter, so the description must carry the load. It partially does by implying item_id must identify something on Kalita's list, but it never explains the identifier format or where to obtain a valid item_id (e.g. from inventory or game_kalita_open).

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 verb and resource ('Продать вещь Калите' – sell an item to Kalita) and adds a scope constraint ('берёт только вещи своего списка'). It does not name the neighbouring sell tools (game_shop_sell_resource, game_auction_sell, game_vendor_buy), so an agent must infer the distinction from the NPC name 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 phrasing 'сначала его цена, потом продажа' hints at a price-check-then-sell sequence, which is useful implied guidance. However, no explicit prerequisites are stated (e.g. whether game_kalita_open must be called first) and there is no statement of when not to use this versus another sell path.

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