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

With no annotations, the description must carry behavioral detail, but it only says 'without charging', which is unclear and possibly tautological with 'free'. It does not disclose side effects, required permissions, or whether this is a read-only operation.

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 brief and front-loaded with the action, but the phrasing is cryptic. 'Without charging' adds little and may confuse rather than clarify.

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?

The description lacks essential context: what a 'boundary' or 'purchase route' is, what the output looks like, and why a user would call this tool. With no output schema, the description is the only source of expectations, and it is insufficient.

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 schema has zero parameters, so there is no parameter documentation burden. The description does not need to explain parameters, and no parameter-related conflict exists.

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 verb ('Return') and an object ('free and paid boundaries and purchase routes'), but the object is opaque and the phrase 'without charging' is ambiguous. It is not clear what 'boundaries' or 'purchase routes' refer to, nor how this tool differs from siblings like 'check_now' or 'preflight'.

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 description gives no guidance on when to use this tool versus the sibling tools. There is no mention of conditions, use cases, or situations where 'offer' is preferred.

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