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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful behavioral context beyond the annotations: the data comes from providers' own pages and is current as of today, and each offer is evaluated on its first year against the cheapest regular plan with equivalent memory, which defines what an 'offer' means here. It still says nothing about result ordering or rate limits.

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 sentence with no filler, and the core concept (introductory/sale prices) is front-loaded before the evaluation methodology. It is dense but every clause carries meaning.

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 read-only, open-world=false listing tool with no output schema, the description conveys the concept of the returned data (first-year-judged offers) but omits what fields come back, ordering, and currency assumptions. Adequate but with clear gaps.

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?

Schema description coverage is 100%, so providers, min_ram_gb and max_usd_month are already fully documented in the schema. The description adds nothing about how these filters interact with the first-year comparison logic, so the baseline 3 applies.

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 the resource (introductory/sale VPS prices scraped from providers' own pages today) but never uses a clear verb like 'list' or 'return', and offers no differentiation from siblings such as ask_vps_prices or search_vps_plans, which sound like they return overlapping data. An agent can infer it is an offers/price-listing tool, but cannot tell from the text alone how it differs from those siblings.

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?

There is no explicit when-to-use guidance, no prerequisites, and no mention of alternatives. The phrase 'today' hints at freshness-driven usage, but the agent is left to guess whether this replaces or complements ask_vps_prices and search_vps_plans.

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