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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and closed-world behavior. The description adds useful context about what options are returned (owner numbers, flows, pages, entities, fields), but it does not describe the response shape, pagination, or any auth/rate-limit behavior. With annotations covering safety, this is adequate but not rich.

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 a single, compact sentence with no wasted words. It is front-loaded with the core resource, though the noun-phrase style is slightly less direct than a verb-led description.

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 one-parameter read tool, the description covers the main purpose and return categories. However, because there is no output schema, it should more fully explain the returned option structure or how to use the options; the current text leaves some 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?

Schema coverage is 100% and the single app_id parameter is fully documented in the schema. The description does not add any meaning beyond the schema, so the baseline of 3 applies.

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 identifies the resource (WhatsApp trigger options) and enumerates the option categories (numbers, flows, pages, entities, fields), making the tool's purpose clear. It does not explicitly contrast with sibling tools like list_whatsapp_triggers or create_whatsapp_trigger, so it stops 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?

There is no explicit when-to-use guidance, no mention of prerequisites, and no named alternatives. The phrase 'What a WhatsApp trigger can use' implies it is a discovery call, but an agent must infer that it should be used before creating or updating a trigger.

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