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

With no annotations, the description carries the burden well: it discloses the credit conversion rate, which tiers are purchasable now versus merely priced, and — unusually valuable — that purchase_data will fail with '503 not_yet_deliverable' on the unwired tiers, preventing a wasted call. It stops short of describing pagination or the shape of the returned list.

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?

Front-loaded with purpose and pricing, then the buyable/not-buyable distinction, then the precondition. Sentences are dense with product jargon (DePIN, DAG-manifold, mcp_unlimited) but each carries distinct information and none is filler.

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?

There is no output schema, so the description should ideally describe what a product listing contains; it covers pricing and entitlement status but not the fields returned per product. Given the zero-parameter surface and the strong behavioral coverage, it is close to complete for an agent's needs.

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?

The tool takes no parameters, so the baseline is 4. The description still adds meaning by explaining what the listed items are priced in and which entitlement states appear in the catalog.

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+resource ('Browse purchasable products') and immediately qualifies it with pricing ('$1 = 1 credit'), so the agent knows this is the catalog/price-listing tool rather than the acquisition tool. It never names a sibling to contrast with, but the wording is specific enough to separate it from list_datasets and purchase_data on its own.

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 an explicit ordering prerequisite ('Call after register_agent') and draws a clear buyable/not-buyable line, routing the agent to purchase_data for the actual transaction. It does not state when a different listing tool would be preferable, which keeps it short of a 5.

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