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

The description adds value beyond annotations (readOnlyHint, openWorldHint, destructiveHint) by detailing what information is returned and what is excluded. However, it does not mention any potential rate limits, authentication requirements, or error conditions, which would have made it fully transparent.

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 description is three sentences long, with the first sentence immediately stating purpose and return values. Every sentence contributes essential information without redundancy or fluff.

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?

Given the simple one-parameter tool with full schema coverage, an output schema, and clear annotations, the description covers all necessary aspects: what the tool does, what it returns, and constraints. No gaps are evident.

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?

The description reinforces the schema's parameter description for 'domain' by repeating the requirement for a single domain and clarifying it should not be a list or search query. This adds practical context beyond the schema's structured definition.

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?

The description clearly states the tool looks up a 'public Website Launches launch record for a single domain' and lists specific return fields. It explicitly distinguishes from search, list, discover, or export operations, making the purpose unmistakable.

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 provides explicit guidance: 'Single domain only; does not search, list, discover, or export websites.' It also advises only surfacing secondary details (hosting, registrar, location) if explicitly requested, which helps the AI agent decide when to use this tool versus alternatives.

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