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

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=true, so the description doesn't need to repeat those. It adds the key requirement and the Korean-language constraint, which are useful behavioral context. However, it doesn't describe potential side effects or response behavior beyond that, so the additional transparency is limited.

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?

The description is a single, front-loaded sentence that places the key requirement first. It's concise with no filler, though it mixes Korean and English. It effectively communicates the core action in minimal words.

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 simple one-parameter tool, the description covers the key requirement, the parameter's meaning, and a language constraint. It relies on the schema for length limits and annotations for safety. However, it leaves ambiguity about whether the input must be Korean or the tool operates only on Korean bios, and it doesn't state success/failure behavior, which is a minor gap.

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 0%, so the description must compensate. It clarifies that the 'bio' parameter is the user's introduction and must be in Korean, adding semantic meaning beyond the schema's type and length constraints. Still, it doesn't explain the format or implications of the Korean-only requirement further.

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 clear action: '내 소개를 한국어로 바꾼다' (change my introduction to Korean), specifying the resource (bio) and a constraint (Korean only). This makes the purpose distinct, though it doesn't explicitly differentiate from sibling tools. No direct sibling competes for the same action.

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 tool versus alternatives is provided. The only usage hint is the key requirement, which is a prerequisite but not a selection criterion. There's no mention of conditions under which another tool should be chosen instead.

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