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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered and the description is not required to restate it. It does add genuine behavioral context by disclosing provenance: values are computed from the game's ammo config and speed falloff, consistent with the dzpage.com comparison page, which tells the agent how much to trust the numbers.

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?

Two sentences, roughly 55 words, with the purpose and metric list front-loaded and the provenance note second. No filler, no restatement of the name, and every clause maps to a parameter or an output metric.

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 carries the burden of describing returns and does so by enumerating the compared metrics. It also bounds inputs (up to 6 weapons, given distances) and names the vest-dependent column. Only minor gaps remain, such as output ordering or fallback when a weapon/ammo class is invalid.

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 75% (distances_m has no description at all). The description compensates meaningfully: 'up to 6 firearms' reinforces the weapons bound, 'at given distances' ties distances_m to the damage-falloff computation, and 'with and without a vest' explains what the vest parameter controls. It still does not clarify the ':<ammo class>' syntax or the lang enum, which the schema handles.

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 (compare) and resource (DayZ firearms) and enumerates the exact metrics produced: damage per shot, hits-to-kill with/without vest, muzzle velocity, rate of fire, dispersion, magazine size. This is clearly distinguishable from siblings like search_items, get_item, or get_infected without opening any schema.

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 implied by the comparison framing and the 'up to 6' bound, so an agent can infer this is for head-to-head stat comparisons. However, there is no explicit when-to-use guidance, no statement of prerequisites, and no mention of alternatives such as search_items/get_item for single-weapon lookups.

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