Get streaming prices by country

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

Annotations already establish read-only, open-world, idempotent, and non-destructive behavior. The description adds useful output context (one row per plan per country, local currency, price text and numeric price), but it does not mention potential charges or the max_charge_usd safeguard at the top level.

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 two tightly written sentences, front-loaded with the core action and followed by return-shape detail. Every sentence contributes directly to understanding the tool.

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?

Given rich schema descriptions and annotations, the definition is nearly complete. The one notable omission is that the description does not surface the charge-related behavior described in max_charge_usd, which is important context for an open-world paid lookup.

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?

Input schema coverage is 100%, so the schema already documents all three parameters in detail, including service choice, country codes, and max_charge_usd. The description only restates country and service scope, so it does not add meaning beyond the schema.

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 states a specific verb and resource: getting monthly Spotify and Netflix plan prices in local currency for country codes. It clearly distinguishes the tool from a generic lookup by naming services, locality, and output shape.

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 'for a list of 2 letter country codes,' but there is no explicit when-to-use or when-not-to-use guidance. With no sibling tools, alternatives are not relevant, but the description still leaves selection conditions implicit.

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