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

No annotations are provided, so the description carries the full burden. It discloses nothing about read/write behavior, permissions, return format, or whether the data is aggregate or per-player, leaving the agent with no behavioral context.

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?

It is only two words, which is concise in length but under-specified rather than usefully concise. There is no front-loaded actionable context because there is almost no content at all.

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 three parameters, one required region, no annotations, and no output schema, the description is far too thin. An agent cannot determine what 'player languages' returns or how to use the required filters correctly.

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?

The schema documents period and region with enum descriptions, but min_tier has no description. The tool description adds no parameter meaning at all, so the 67% schema coverage gap remains uncompensated.

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 is essentially the tool name humanized: 'Player languages.' It does not state a verb, scope, or return type, so an agent cannot tell exactly what it does or how it differs from siblings such as clans_languages.

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 guidance on when to use this tool, when not to use it, or which sibling it replaces. The presence of clans_languages makes this omission especially costly because the agent has no way to choose between them from the description.

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