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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so safety and network behavior are covered structurally. The description adds only the content domain (prices and quota); the word 'public' hints that no account scoping is required, but no format, freshness, or scope of the quota figure is disclosed.

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?

It is a single ten-word fragment with no filler, so it is maximally brief. However, the brevity tips into under-specification: a fragment without a verb reads more like a field label than a usable tool definition.

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?

With no parameters, no output schema and full annotation coverage, the remaining burden is explaining what comes back, and the description does gesture at that (prices, quota). It is only minimally sufficient, though: it does not say whether prices are a static list or per-currency, nor what the quota figure represents.

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 zero parameters, so the description has no parameter semantics to carry and cannot be faulted for omitting them. Baseline 4 applies for a parameterless tool.

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 names the resources returned ('plan prices' and 'agent API quota'), which does separate it somewhat from siblings like get_usage or get_logs. But it is a bare noun phrase with no verb and no explicit statement of what the tool does with those values, leaving the agent to infer that it retrieves/returns them.

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?

There is no when-to-use guidance, no mention of prerequisites, and no routing to alternatives such as cloudhosting_get_usage or cloudhosting_get_account. The agent must guess whether pricing is included elsewhere or whether quota data overlaps with get_usage.

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