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

Annotations only declare readOnlyHint=false, so the description carries the behavioral burden, and it supplies just the default quantity behavior. It does not say whether the sale is irreversible, how the price is determined, or what happens if the requested count exceeds the stack, all of which matter for a mutation tool.

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 front-loaded sentence with the action first and the default-quantity note second; nothing is wasted. The parenthetical 'b2-s1..8' token is unexplained, which slightly hurts otherwise efficient phrasing.

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?

No output schema and minimal annotations mean the description should explain the outcome of a sale and error conditions, but it does neither. For a two-parameter mutation tool with 0% schema coverage, the definition leaves out what the agent needs to predict results.

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%, so the description must compensate, and it does partially: it implies item_id is a resource identifier in the 'b2-s1..8' form and that count defaults to the full stack. The 'b2-s1..8' notation is cryptic and the count semantics (e.g., what happens with partial stacks) remain unexplained.

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+resource pair ('Продать магазину ресурс из рюкзака'), making it clearly a sell-to-shop operation on backpack inventory. It does not differentiate itself from sell-capable siblings such as game_auction_sell, game_kalita_sell, or game_vendor_buy, so an agent must infer which channel this tool represents.

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?

There is no when-to-use or when-not-to-use guidance; the phrase 'по умолчанию всю стопку' describes a parameter default rather than a usage condition. With several sibling selling tools available, the description gives no routing rule to pick this one.

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