ncloud_ncs_create_multipart_upload

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

Annotations only carry destructiveHint=false, so the description must disclose side effects; it does state that optional storage class/SSE/Object Lock headers 'apply to the final object' and that the operation yields an uploadId. However, it omits that an initiated upload remains as an in-progress entry that must be completed or aborted, which is relevant cleanup behavior for an agent managing uploads.

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 tightly packed sentences; the first front-loads the action, endpoint, and output, and the second covers optional header behavior. No filler or repetition.

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 multipart initiation with no output schema, the description covers the workflow position, the key returned value, and the optional header semantics. It falls slightly short of full completeness by not addressing abandoned-upload cleanup or when multipart is appropriate vs a single put_object.

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%, so baseline 3 applies. The description adds a small clarification that the optional storage class/SSE/Object Lock headers affect the final object, but it does not go beyond the schema's existing per-parameter documentation for the required parameters.

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?

Begins with a specific verb-resource pair ('Start a multipart upload'), names the exact REST endpoint (POST /{key}?uploads), and states the key output (uploadId). It also names the sibling tools that consume this uploadId, clearly differentiating it from ncloud_ncs_complete_multipart_upload and ncloud_ncs_upload_part.

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 positions this as the entry point of the multipart workflow by saying the returned uploadId is 'used by' the upload/copy/complete/abort siblings. This gives clear context for when to call it, although it does not explicitly state when to prefer it over ncloud_ncs_put_object or mention size thresholds.

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