s3_get_bucket_size

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

No annotations are provided, so the description must fully disclose behavioral traits. It only states the function (calculate size) but omits details such as whether it is read-only, potential costs, handling of large buckets, or pagination. This leaves significant behavioral ambiguity.

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 extremely concise with only two lines. The first sentence front-loads the primary purpose, and the second lists parameters efficiently. No extraneous information is present.

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?

Given the presence of an output schema, the description doesn't need to cover return values. However, it fails to mention the unit of size (e.g., bytes) or any caveats about large buckets. For a simple tool it is somewhat complete, but lacks context that would help an agent anticipate behavior.

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?

With 0% schema coverage, the description partially compensates by explaining 'bucket: 버킷 이름' and 'prefix: 경로 접두사 (선택)'. This adds basic meaning beyond the schema's type-only definitions but lacks format details, constraints, or examples.

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 clearly states the tool calculates the total size of an S3 bucket or prefix, using the verb '계산' (calculate) and the resource 'S3 버킷(또는 prefix)'. This purpose is distinct from sibling tools like s3_list_buckets or s3_list_objects, though it does not explicitly contrast them.

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?

The description provides no guidance on when to use this tool versus alternatives. No context about prerequisites, limitations, or appropriate scenarios is given, leaving the agent without decision support.

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