Clear SMS configuration

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

Descriptions adds value beyond annotations: specifies the effect (disabling SMS) and possible error (TN_NOT_OWNED). Annotations already indicate destructiveness; description complements with concrete behavioral details.

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?

Two sentences, front-loaded with action, then alternative and error. No wasted words.

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 one parameter, no output schema, and annotations, the description covers purpose, alternative, and error. Could be slightly more explicit about the irreversible nature (though destructiveHint covers it), but still reasonably 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 covers 100% of parameters with description. Description does not add additional semantics beyond restating 'number you own', which is already implied by the schema.

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 removes the SMS usage row from a number, disabling SMS. It distinguishes from sibling 'num_update_sms' by contrasting removal with modification.

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?

Explicitly states when to use (to disable SMS by removing config) and when not (to change settings, use num_update_sms). Provides a direct alternative.

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