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

No annotations are provided, so the description carries the full behavioral burden, and it discloses nothing: not whether this is a read-only operation, whether it generates an image asset, what the response format is, or any limits. "OG card" hints at a rendered card but never confirms it.

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 short, but brevity here comes from under-specification rather than economy. There is not enough content to be front-loaded, and the one phrase present is opaque.

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 annotations and no output schema, the description is the only source of behavioral information, and it supplies none. An agent cannot tell whether to expect JSON comparison data, an image URL, or a rendered asset, nor how this differs from clans_compare.

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% with only two parameters, both documented in the schema (tags 2-4 clan tags; region enum). The description adds nothing beyond the schema, 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?

"Clans comparison OG card" largely restates the tool name (og_clans_compare) without a clear verb+resource statement. "OG card" is unexplained jargon, leaving it ambiguous whether the tool returns comparison data or renders a social-preview image.

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?

No guidance on when to use this versus the many sibling tools (clans_compare, clans_by_tag, og_clans_by_tag). No prerequisites, no exclusions, no indication of what distinguishes an 'OG' variant from the regular compare tool.

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