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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered; the description adds that the data is credential-free public data and how pagination works (next_page is set when more results exist). It omits page size or rate-limit behavior, but adds real context beyond the annotations.

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?

Dense but front-loaded: purpose first, then pagination, then parameter behavior, then the sibling pointer. Every sentence carries signal, though the parameter sentences run 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?

With an output schema present, return values need not be detailed, yet the description still characterizes the payload and facets. Pagination, region, language, and the search alternative are all covered, leaving only edge cases like page size unstated.

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 baseline is 3, but the description goes beyond the terse schema labels: cc is clarified as selecting both store region and price currency, l is clarified as accepting a code or locale (en or en-US) with the locale's primary language used for text, and page is tied to the next_page signal. This meaningfully enriches the parameter semantics.

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 a page of the PlayStation Store 'all games' grid) and enumerates what the items carry (price, platforms, media, filter facets with counts). It explicitly distinguishes itself from playstation_search, so an agent can route between browse and search without opening either schema.

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 sibling alternative playstation_search and the condition that selects it (when you want to search rather than browse the full grid). It doesn't address when to prefer playstation_category, playstation_latest, or playstation_deals over this grid, but the primary routing decision is covered.

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