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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds genuinely useful non-structural context: 'Credential-free public PlayStation Store data' tells the agent no auth is needed, and it describes the returned shelf/item structure.

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 return-shape sentence is dense but front-loaded and information-rich, followed by parameter semantics and the routing hint. No filler sentences; only the opening sentence is long.

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?

An output schema exists, so return values need not be explained further, and the description still summarizes them. Auth status, parameter meaning, and sibling routing are all covered; only explicit when-not guidance is absent.

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% but the schema descriptions are terse ('Language code', 'Store country code'). The description adds real meaning: cc selects the store region and therefore the price currency, and l accepts a locale like en-US whose primary language drives text. This exceeds the schema text.

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 ('Returns the PlayStation Store latest-releases landing page') and details the return shape (merchandising shelves plus a flattened de-duplicated item list). It explicitly distinguishes itself from the sibling playstation_browse, which serves the all-games grid.

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?

Names the alternative tool explicitly ('Use playstation_browse to browse the PlayStation Store all-games grid'), giving a clear routing rule for the most likely confusion. It does not state exclusions or when-not to use this tool, but the context is clear.

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