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

No annotations are provided, so the description bears full responsibility for behavioral disclosure. It explicitly discloses the authentication requirement, which is valuable. However, it does not mention other behavioral aspects like whether the list is static/cached, whether it reflects real-time availability, or what the response structure looks like. For a simple read-only listing, the disclosure is adequate but not rich.

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 that front-loads the core action and immediately states the key behavioral detail (no auth). Every word earns its place; no filler or redundancy.

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 parameterless listing tool with no output schema, the description fully covers what the tool does, what data it returns, and the access requirement. Nothing an agent needs to invoke it successfully is missing.

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 zero parameters, the schema already fully covers parameter semantics (trivially). The description adds useful context about the content of the return value (pricing, specs, locations), which helps set expectations beyond the empty input schema. Baseline 4 is appropriate given the parameterless design.

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 uses a specific verb ('List'), names the resource ('available VPS hosting packages'), and specifies the kind of information returned ('pricing, specs, and locations'). This clearly differentiates it from siblings like listVpsLocations or getVpsPackageDetails, which cover narrower or different aspects.

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?

It states that no authentication is required, which is a useful usage condition. However, it does not explicitly say when to prefer this tool over alternatives such as getProductCatalog or getVpsPackageDetails, nor does it mention any exclusions or prerequisites. Usage is implied rather than fully spelled out.

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