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

Beyond the annotations, it discloses two important real-world effects: an actual message will be sent and Meta may charge for it. The approval requirement and 24-hour-window behavior add further useful operational context, with no contradiction to the write-oriented, open-world annotations.

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?

Three short sentences front-load the operation and its key constraint, then cover component formatting and cost. Every sentence contributes useful selection or invocation information without filler.

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?

Together with the fully documented schema and annotations, the description provides enough information to select and invoke this external send safely, including approval, window, format, and billing considerations. Explicit sibling routing for template discovery and ordinary text messages would make it more 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?

Schema description coverage is 100%, so the structured fields already document all five parameters. Saying that components follows the Meta Cloud API format adds only modest guidance beyond the schema's existing description of optional header, body, and button parameters.

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 specifies the action and resource—sending an approved template—and the title supplies the WhatsApp context. The 24-hour-window note also distinguishes template messaging from ordinary session text messaging such as bridge_send_text.

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?

It gives concrete usage context: the template must be approved, and this method works outside the 24-hour window. It does not explicitly route agents to bridge_send_text for session messages or bridge_list_templates for discovering suitable templates.

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