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

Annotations cover safety (readOnlyHint=false, destructiveHint=false, openWorldHint=true), but the description adds genuinely useful disclosure beyond them: listings are inactive unless active=true, active listings are immediately visible to buyers, and the call needs the user's Cotlet API key with access to this app. It does not describe what the response returns, which is the remaining gap.

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 sentence about inactive-by-default and active listings going live 'right away' appears twice almost verbatim, and the seller's concurrently. The opening and the confirmation/auth notes are front-loaded and useful, but the verbatim duplication is wasted space that should have been trimmed.

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?

No output schema exists, so the description must stand alone, and it covers the important invisible behaviors: default-inactive state, immediate visibility when active, price unit, confirmation-by-default, and the required API key scope. The only omission is what a successful creation returns (e.g., product ID).

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% with per-field descriptions for all 9 parameters, so the schema carries the parameter burden. The description's notes on price being in US cents and the file being a PDF/ZIP restate schema content rather than adding new semantics. Baseline 3 applies.

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?

States a specific verb and resource: 'Creates a Digital Download listing from the URL of a PDF or ZIP.' An agent knows exactly what is produced and from what input. It does not name siblings like update_product or set_product_status to sharpen the boundary, so it falls short of a 5.

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?

Gives useful behavioral context (confirm each call by default, active listings go live immediately) but never says when to choose this over set_product_status or update_product, nor any prerequisites like having the file already hosted at a URL. Usage is implied rather than contrasted with alternatives.

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