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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint=false, so the safety profile is covered. The description adds valuable context beyond that by spelling out exactly which plan information is surfaced (free vs one-time download vs PRO tier details), which matters since no output schema exists.

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?

Two tight sentences: the first front-loads what the tool returns, the second front-loads when to call it. No filler or redundancy.

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?

With no output schema, the description does the work of summarizing the returned plan structure, and it covers the locale default indirectly via the schema. A minor gap is whether prices are localized or in a fixed currency, but nothing critical to calling the tool 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 single locale parameter has 100% schema description coverage including the enum values and the default behavior, so the schema fully carries parameter meaning. The description contributes nothing about locale or localized pricing beyond that, which is the baseline case.

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 names a specific verb and resource and enumerates the concrete contents (free tier features, one-time per-CV download price, PRO monthly/yearly with AI features and download allowance), so an agent knows exactly what it returns. It stops short of naming the nearest sibling, get_my_takemeup_billing, which could be confused with plan pricing.

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?

'Use when the user asks what something costs or what PRO includes' gives a clear triggering condition with concrete example intents. It does not state exclusions or point to get_my_takemeup_billing for the user's own charges, so the routing is helpful but not exhaustive.

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