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

Annotations already declare destructiveHint=true, idempotentHint=false, so the safety profile is partly covered. But the description adds no behavioral context: it doesn't say that incoming/outgoing/recording rules are overwritten, whether omitted fields are preserved or reset, or that the change is non-reversible.

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?

A single front-loaded sentence with zero filler. Efficient, though the terseness contributes to the specification gaps elsewhere.

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 destructive, non-idempotent mutation tool with nested rule objects, no output schema, and 0% parameter documentation, the description does far too little. It identifies the target resource and scope but omits what the rule payloads control and what the destructive aspect means.

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 0% across four parameters including two nested objects (incoming, outgoing) and an enum. The description only implies number_id via 'one phone number' and says nothing about the incoming/outgoing/recording rule bodies, so it fails to compensate for the coverage gap.

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?

States a specific verb ('Update') and resource ('Number rules') scoped to 'one phone number'. However, it doesn't differentiate itself from sibling update tools (update_agent, update_campaign) or clarify what a 'Number rule' comprises, leaving the resource somewhat abstract.

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 when-to-use condition, no prerequisites, and no reference to alternatives such as get_number_rules, which is the obvious read counterpart. The agent must infer usage entirely.

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