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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions that links are time-limited and that a signature is required, but does not disclose potential side effects (e.g., no destructive action implied), error behaviors, or idempotency. This is adequate but not thorough.

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 sentences, conveying the purpose and prerequisite steps without any extraneous information. Every sentence earns its place—no fluff, efficient communication.

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 tool has 5 required parameters and a multi-step workflow, the description explains the prerequisite but omits details about return values (e.g., format of download links) and potential error conditions. The lack of output schema increases the need for description completeness, which is partially met.

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 baseline is 3. The description adds value by explaining the workflow: signing the challenge with the paying wallet before calling the tool. This contextual relationship between parameters (challenge, signature, buyer_wallet) goes beyond individual schema descriptions, justifying a 4.

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 explicitly states the tool retrieves time-limited download links for a specific digital product (bought and settled), with a clear action and resource. It distinguishes from siblings by referencing the prerequisite get_download_challenge tool, providing context for its specific role.

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 clear step-by-step usage instructions: first call get_download_challenge, sign the message, then call this tool with the challenge and signature. It does not explicitly exclude other scenarios, but the prerequisite is clearly stated, guiding appropriate use.

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