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

With no annotations, the description carries the full behavioral burden. It usefully discloses the exact tier values and that they are returned in display order, but it does not clarify that this is a read-only, zero-input operation or describe the response shape beyond the enumerated names.

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?

The description is short and front-loads the useful enumeration of tiers. The second sentence does not earn its place because it references a parameter that does not exist and adds confusion rather than clarity.

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 simple zero-parameter list tool, the exact tier names and ordering are helpful and largely sufficient. Still, the description lacks usage context relative to list_pricing_multipliers and contains a misleading parameter instruction, so it is not fully complete.

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 input schema has zero parameters, so there is no real parameter semantics to clarify. However, the description says 'Pass the name as tier,' which introduces a nonexistent parameter-like instruction and could mislead an agent into trying to pass an argument.

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 clearly states a specific verb and resource: listing budget tiers, and it enumerates the exact tiers in display order. It is distinguishable from list_pricing_multipliers by resource, though it does not explicitly name that sibling as an alternative.

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 guidance on when to use this tool versus list_pricing_multipliers or other related tools. The phrase 'Pass the name as tier' does not provide a clear usage condition and is confusing given the tool has no parameters.

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