bach-whatsapp_number_validators

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. While 'verify' implies a read-only operation, the description omits rate limits, authentication requirements, error handling, or the structure/format of the returned status information.

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 consists of two efficient sentences: the first establishes purpose and scope, the second provides input requirements. There is no redundant or wasted text; every clause earns its place.

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 simplicity (single parameter) and lack of output schema, the description adequately covers inputs. However, with no annotations and no output schema, it should ideally describe what the tool returns (e.g., status object, boolean flags) or error behaviors to be complete.

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?

Although the schema has 100% coverage, the parameter description only provides an example value. The text adds critical semantic context by explicitly stating the number must be provided 'along with the corresponding country code,' clarifying the expected format beyond the schema's example.

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 verifies WhatsApp registration and determines business status using specific verbs ('Verify', 'determine'). It implicitly distinguishes from bulk_validation by referencing 'a given number' and from phone_number_validation siblings by mentioning WhatsApp Business detection, though it does not explicitly name sibling alternatives.

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?

Usage is implied by the tool name ('single_number') and phrasing ('a given number', 'a particular number'), suggesting this is for individual validation rather than bulk operations. However, there is no explicit guidance on when to choose this over validate_single_number_via_post_request or check_if_number_is_business_via_get_request.

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