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

Annotations already cover safety (readOnly, idempotent, non-destructive, closed-world), so the description's added value is in revealing payload composition — notably that install requirements come from a static check of the download rather than a live install, which hints at reliability limits. It doesn't cover behavior on unknown slugs, but that is minor.

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?

A single front-loaded sentence identifies the resource and scope before the long field list. The nested parenthetical at the end is dense but still parseable; nothing is wasted.

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?

With no output schema, the description carries the burden of describing returns and does so field by field, including the less obvious install-requirements section. Only error/empty-result behavior is left unstated, which is a small gap for a simple read tool.

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 only 50%: the required 'slug' has no schema description, and the description compensates by defining it as a product slug sourced from search_products. The 'locale' parameter is already fully documented by the schema enum, so the description correctly does not repeat it.

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 ('Details of one RPScripts product by slug') and enumerates exactly what the payload contains (description, frameworks, version, categories, price, purchasability, install requirements). It also distinguishes itself from the sibling search_products by naming it as the source of the slug.

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 parenthetical '(from search_products)' establishes the intended workflow: search first, then fetch details by slug. There is no explicit exclusion (e.g. 'do not use for browsing or keyword search'), but the single-product scope makes the alternative obvious.

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