update_phone_number_messaging_settings

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

With no annotations, the description carries the full burden of behavioral disclosure. It explains parameter value semantics (e.g., empty string unassigns a profile), but it does not disclose side effects, permissions, idempotency, or error behavior. The return value is only vaguely described as 'Dict[str, Any]', leaving significant gaps.

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 front-loaded with a clear summary and uses a consistent Args/Returns structure. It is reasonably concise, though the parameter list is inconsistent with the schema, which slightly reduces clarity.

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?

The tool has a nested object parameter, no output schema, and no annotations. The description does not clarify how to construct the 'request' object, nor does it mention preconditions, error cases, or related messaging profile/product concepts. The vague return type further limits completeness.

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 description adds semantics for messaging_profile_id and messaging_product, but these do not match the actual input schema, which only contains 'id' and an opaque 'request' object. The schema has 0% description coverage, and the description fails to explain that the real parameters are nested inside 'request', likely confusing the agent.

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 function: 'Update the messaging profile and/or messaging product of a phone number.' This is specific and distinguishes it from sibling tools like update_phone_number (which updates other properties) and update_messaging_profile (which updates the profile itself).

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?

No explicit guidance on when to use this tool versus alternatives. The description does not mention related tools or provide exclusions, leaving the agent to infer usage solely from the summary. It lacks any 'use this if...' or 'instead use...' details.

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