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

Beyond the annotations, the description usefully discloses that an empty value clears the description or calling code, clarifying the potentially destructive behavior. It does not explain how omitted or null fields are handled, and the [write] marker merely repeats the mutation signal already supplied by readOnlyHint=false.

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 compact sentence front-loads the operation and target selectors, then states the clearing behavior. There is essentially no wasted wording apart from the mildly redundant [write] prefix.

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 description is adequate for understanding a basic metadata edit, but the bare five-parameter schema leaves notable invocation details unsupported. In particular, the agent must infer that a selector is required, how voip_list_country should be formatted, and whether omitted or null values preserve existing settings.

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?

With 0% schema description coverage, the description partially compensates by naming both selectors and covering the editable title, description, and calling code. It does not explicitly map voip_list_country to the calling code or provide its format, and it leaves identifier precedence and empty-string versus null semantics unclear.

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 gives concrete operations and a resource: rename a saved VOIP list or change its description or calling code. This substantively distinguishes metadata editing from member management, though it does not explicitly contrast the tool with create_voip_list or other edit siblings.

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?

The enumerated operations provide clear when-to-use context, and either voip_list_id or voip_list_uuid is identified as the target selector. There is no explicit when-not guidance, alternative tool for membership changes, or prerequisite beyond using a saved list.

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