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

Annotations already indicate the operation is not read-only and not idempotent. The description adds 'signed R2 URL,' which evokes a credentialed, potentially time-limited upload URL, but it does not disclose expiration, what state is created, or what happens after upload. There is no contradiction between description and annotations.

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 with no filler. It names the exact output ('signed R2 URL') and the intended purpose without redundant phrasing.

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?

The description is adequate for a relatively simple three-parameter tool, but it leaves workflow context implicit. With no output schema, it does not clarify the shape of the returned URL or its expiration semantics, and it does not relate the tool to confirm_asset_upload.

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 coverage is 100%, so the schema already explains all three parameters. The description adds no parameter-specific meaning beyond broadly referring to 'content assets,' so the baseline of 3 is appropriate.

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 names a specific action and resource: getting a signed R2 URL for uploading content assets. It is easy to distinguish from sibling tools like confirm_asset_upload because it targets the URL-generation step, not the confirmation step.

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 is given about when to prefer this tool over alternatives or about the surrounding workflow. There is no mention of the intended ordering such as 'use this before confirm_asset_upload' or any exclusion conditions.

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