Create an upload link for a DataLens bucket object

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

Annotations already state readOnlyHint=false, openWorldHint=true, idempotentHint=false, and destructiveHint=false. Beyond that, the description discloses important security behavior: the link is bearer-like ('works for whoever holds it'), time-limited ('for a time'), returned in the result, and should not be repeated. It also candidly notes the operation is experimental and not measured, which is valuable 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?

The description is two short sentences plus a brief caveat, and it front-loads the core purpose before operational guidance. There is little filler, though the phrasing is slightly indirect and could state the action more directly. Overall it is appropriately sized for a simple four-parameter tool.

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 four-parameter tool with full schema coverage and no output schema, the description covers the returned artifact and its handling, which is the most important missing piece. It does not mention required permissions or whether an existing object would be overwritten, but the annotations supply safety hints and the core contract is clear.

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 the schema already documents all four required parameters. The description adds no parameter-specific meaning, syntax, or constraints beyond what the schema provides. Baseline 3 is appropriate when the schema fully carries parameter semantics.

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 title and description together convey the purpose: creating a signed upload link for a bucket object. The description says 'A signed link to put one object into the bucket,' which is clear but phrased as a noun rather than an action verb. It also does not explicitly distinguish this from the sibling download URL tool, though the 'put' wording implies upload.

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 gives handling instructions for the produced link ('hand it to the person and do not repeat it'), which is useful operational guidance. However, it provides no guidance on when to choose this tool versus alternatives such as datalens_cloudenvironmentstorage_bucket_download_url_create or bucket_objects_list. There are no explicit when/when-not conditions.

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