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

Annotations declare readOnlyHint, idempotentHint, and openWorldHint=false, so safety is largely covered; the description usefully adds that no authentication is needed, which annotations do not convey. It discloses no rate limits or output characteristics, but this is a trivial read-only endpoint.

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 front-loaded sentence that names the cost topic first and the payment methods second, with the auth note appended. No filler, no repetition of the title.

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, read-only tool with an output schema already defining the return shape and annotations covering safety, the description supplies everything needed: what it returns (cost/payment info) and the auth condition. Nothing material 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?

The tool takes zero parameters, so the schema requires no supplementation and the baseline for a 0-param tool applies. The description correctly implies the call is argument-free.

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 resource (search pricing) and its scope (card and stablecoin payment terms) with a clear descriptive phrasing. No sibling tool touches pricing, so the agent can distinguish it immediately from get_search_status, start_job_search, etc.

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?

The clause 'No auth required' tells the agent it can call this tool without credentials, which is genuine usage context not present in the annotations. However, it offers no explicit when-to-use framing relative to alternatives or any exclusions.

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