check_multiple_domains

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

No annotations are provided, so the description carries the full burden. It mentions the tool returns 'results for all domains with summary statistics,' which adds some behavioral context about output. However, it lacks details on rate limits, error handling, authentication needs, or what 'availability' means (e.g., registration status). For a tool with no annotations, this is a significant gap in transparency.

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 highly concise and front-loaded, consisting of two sentences that efficiently convey the tool's purpose and output. Every sentence earns its place by providing essential information without waste, making it easy to understand quickly.

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 tool's moderate complexity (batch domain checking), no annotations, and no output schema, the description is minimally adequate. It covers the basic purpose and output format but lacks details on behavioral traits, error cases, or deeper context. With no output schema, it should ideally explain return values more, but it provides enough to be functional with clear gaps.

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 input schema has 100% description coverage, with the 'domains' parameter fully documented in the schema. The description adds marginal value by reinforcing the 'up to 50 domains' limit, which is already in the schema description. No additional parameter semantics are provided beyond what the schema covers, so the baseline score of 3 is appropriate.

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's purpose: 'Check availability for multiple domains at once' with a specific verb ('check') and resource ('domains'), and mentions the batch capability ('up to 50 domains'). It distinguishes from the sibling 'check_domain_availability' by emphasizing 'multiple domains at once,' but doesn't explicitly contrast them. The purpose is clear but lacks explicit sibling differentiation.

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 usage context by stating 'at once' and 'up to 50 domains,' suggesting it's for batch operations. However, it doesn't explicitly say when to use this tool versus the sibling 'check_domain_availability' (e.g., for single vs. multiple domains) or provide any exclusions or alternatives. Usage is implied but not clearly defined.

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