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

Annotations already declare readOnlyHint=true, destructiveHint=false and closed-world scope, so safety is covered. The description adds a genuinely non-obvious behavioral trait beyond the annotations: this call is a prerequisite whose result other tools resolve against. It stops short of describing the returned payload, but adds real value over the structured fields.

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 short sentences, no filler, with the identity statement front-loaded ahead of the usage directive. Every clause earns its place.

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 zero-param read tool with annotations covering safety, the description is nearly sufficient. The only gap is that no output schema exists and the description does not say what the account object contains, though 'everything else resolves against what it returns' implies an identity/ID is returned.

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 tool takes no parameters, so there is nothing for the description to disambiguate; baseline 4 applies. No parameter-related gaps exist.

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 and resource ('Identify the signed-in VoiceMoat account'), which is enough to distinguish it from siblings like get_voice_profile and list_profiles without opening a schema. It is clear but does not explicitly contrast itself against the closest sibling, so it falls just short of 5.

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?

'Call this first: everything else resolves against what it returns' gives explicit, actionable sequencing guidance that most sibling tools lack. It does not name any alternative or a when-not condition, but for a zero-param identity tool the context is clear.

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