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

Annotations already declare destructive, non-idempotent, open-world behavior, so the description's job is to add constraint detail. It does that well, disclosing that only adena and a few listed items can leave the character and that there is a daily cap — non-obvious limits an agent cannot get from the schema. It still omits failure behavior (e.g. what happens if the item is ineligible or the cap is hit).

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 short sentences, front-loaded with the action and followed by the item caveat and the cap. No filler; the mildly vague phrase 'a few listed items' is the only soft spot.

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 exists, so the description should cover what happens on call and on failure. It captures the key transferability and daily-cap constraints but leaves return behavior, error cases and the meaning of 'count' unexplained for a destructive two-parameter mutation.

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 coverage is 0%, so the description must carry parameter meaning; it explains that item_id 57 means adena and that only certain item_ids are transferable. It says nothing about 'count' (quantity semantics, upper bounds) and gives only one concrete item_id, leaving a partial gap.

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 target ('Put an item in the open trade window'), which clearly separates it from trade_accept, trade_confirm and trade_request. It stops short of explicitly naming sibling alternatives, so it is clear but not maximally differentiating.

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?

'open trade window' implies the window must already exist before calling, which is useful implied context. However, no explicit when-to-use / when-not-to-use rules or mention of the alternative tools are given.

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