contact_getClassInfo

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

No annotations are provided, and the description offers no behavioral details such as side effects, permissions, return format, or edge cases. The description essentially repeats the tool name and provides zero added value beyond the structured schema.

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 extremely short, but this is under-specification rather than conciseness. It lacks crucial information and does not earn its place as a useful guide for an agent.

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 complexity of WhatsApp contact management, the absence of output schema, annotations, and any substantive description makes this tool virtually unusable for an agent. The description is far too sparse for the context.

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 schema provides full coverage (100%) with descriptions and examples for both parameters, so the baseline is 3. The description itself adds nothing beyond the schema, though the unusual fact that contactId is not required is left unexplained.

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 'Get the contact' is vague and fails to explain what 'class info' means or how this differs from other contact tools like contact_getChat or client_getContactById. It restates the resource but does not specify the action's scope, making it hard to distinguish from siblings.

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?

There is no guidance on when to use this tool versus alternatives. With many similar contact-related sibling tools, the absence of usage context leaves the agent without direction for tool selection.

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