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

annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds that results are paginated, which is mildly useful behavioral context, but says nothing about rate limits, result volume, or auth needs beyond what the schema and annotations already imply.

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?

Two short sentences with zero waste. The core scoping constraint ('without a keyword') is front-loaded and the alternative follows immediately.

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, and the schema fully documents all required parameters. The description supplies the essential routing information for a browse-by-category tool, so nothing an agent needs in order to call it correctly is missing.

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 description coverage is 100%, so all five parameters (Category, MediaType, Cursor, Country, Locale) are already documented in the schema, including MediaType's allowed values and Cursor's opaque pagination semantics. The description adds no parameter-level detail, so baseline 3 is correct.

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 ('Browse') and resource ('one paginated Microsoft Store category'), and explicitly distinguishes itself from microsoftstore_search ('without a keyword'). An agent can tell it apart from the search sibling 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?

Gives clear context ('browse one category without a keyword') and names an explicit alternative ('Use microsoftstore_search for query-based results'). It does not address when to prefer other siblings like microsoftstore_categories, charts, editorial, or spotlight, so it falls just short of full when/when-not coverage.

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