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

No annotations are provided, so the description carries full behavioral burden, and it discloses nothing: not what the comparison produces, not whether it is a read-only operation, not any rate or permission behaviour. Two words provide zero 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?

Two words are maximally front-loaded with no padding, so it is not verbose. However, this brevity is under-specification rather than genuine conciseness; the phrase conveys almost no information.

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 two-required-parameter comparison tool with no annotations and no output schema, the description should explain what is compared and roughly what comes back. It supplies none of that, leaving the agent unable to predict the result of invoking it.

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 100% – both tags (2-4 clan tags) and region (enum eu/na/asia) are fully documented in the schema itself. The description adds nothing beyond that, so the baseline 3 applies.

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?

"Compare clans" is essentially a restatement of the tool name clans_compare, with no added scope or detail. It does not distinguish this tool from the sibling og_clans_compare, nor does it say what aspect of clans is compared (stats, activity, members, etc.).

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 versus clans_by_tag, clans_top, or the identical-sounding og_clans_compare. No prerequisites, no exclusions, no context of any kind.

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