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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description usefully adds that ranking comes from a rule-based score excluding ads and ratings, and caps results at 5, but says nothing about ordering stability, missing-key behavior, or what a 'verified Korean UI' means operationally.

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 English portion is two front-loaded sentences with direct value (ranking method, result cap). The Korean sentence is a full duplicate that adds length without new information, keeping it out of 5 territory.

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 lookup with no output schema and four annotations, the description gives the essential framing: scope, ranking basis, and result count. Missing detail about the returned fields is acceptable since no output schema exists to define a contract.

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 67%: 'key' and 'korean_ui_only' are documented, while 'limit' has only bounds and a default. The description's 'Up to 5 results' restates the schema's maximum rather than explaining how limit interacts with ranking. Baseline 3 is appropriate given the schema does most of the work.

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 ('Find alternatives to an AI service') plus a scoping constraint ('within the same category'), which is enough to distinguish it from get_ai_service and search_ai_services. It does not explicitly contrast itself with the closest sibling, compare_category, so it falls short of a 5.

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 description implies the use case (given one service, find peers), but never states when to prefer it over compare_category or search_ai_services, nor any prerequisite such as needing a key from prior search results. Usage is inferable but not guided.

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