Pricing and payment options

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

Annotations already declare readOnlyHint=true and openWorldHint=false, establishing a safe, closed-world read. The description adds useful behavioral context by labeling the tool 'Free' and describing what the pricing menu contains. It stops short of explaining the response structure or any limits, which is a minor gap for a zero-parameter info tool.

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 definition is extremely compact: one short sentence plus the upfront 'Free.' label. Every phrase earns its place by either naming the resource, stating cost behavior, or enumerating the covered pricing topics.

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-parameter, read-only pricing-info tool with no output schema, the description gives enough detail about what the response covers. It does not describe the exact output format beyond 'machine-readable,' but the topic enumeration is sufficient for an agent to decide whether to call it.

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 there is no parameter semantics burden. The baseline for zero-parameter tools is 4, and nothing in the description creates confusion about inputs.

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 identifies the resource as a machine-readable pricing menu and enumerates its scope: free vs paid tools, pricing, and deposit/spend flow. It is specific enough for an agent to know what information the tool provides, though it does not explicitly differentiate itself from sibling utility tools like tool_catalog.

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?

Usage is implied by the content description—an agent should call this when it needs pricing or payment-flow details. However, there is no explicit statement of when to use this versus tool_catalog or another informational sibling, nor any stated preconditions or exclusions.

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