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

Annotations already establish read-only, idempotent, non-destructive, closed-world behavior. The description adds valuable context beyond them: no sign-in is required, buying occurs externally, and results include prices and product links.

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 tightly written sentences with no wasted text. The core purpose is front-loaded, followed by useful auth and purchase behavior.

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 simple read-only catalog tool with rich annotations, the description is complete enough: it explains what the store contains, that prices and links are returned, and that no sign-in is needed. The optional category filter is well covered by the schema.

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 category enum and its 'Only this category' meaning are already documented. The description lists the store categories but does not add syntax or filtering behavior beyond what the schema provides.

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 states a specific verb and resource: 'Show the public Frely Store'. It also enumerates the store's contents and scope, making it easy to distinguish from sibling tools such as frely_about, frely_list, list_devices, and models_list.

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?

It gives useful usage context by clarifying that the store is public, requires no sign-in, and that purchasing happens on the linked page. It does not explicitly compare this tool with sibling alternatives, so it stops short of full when/when-not routing.

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