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

Read-only and open-world behavior is already carried by the annotations, so the description's job is lighter. It does add useful disclosure about what comes back (each provider's market list price plus the Vietnis price), but says nothing about whether prices are per-seat or total, currency handling, or how 'comparable' plans are matched.

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 states the core capability first. The parenthetical enum list adds length without adding much, but there is no filler or repetition.

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 and five undocumented parameters, the description leaves significant gaps for a pricing tool: billing cycle semantics, language of results, and whether prices are per-user per-month are all unstated. It partially covers level and country, but not enough for correct invocation.

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 0%, so the description must carry parameter meaning. It explains users, country and the four level values, but omits billing (annual vs monthly) and lang entirely — billing is a material pricing driver for a cost-comparison tool.

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 (side-by-side cost comparison), the two named resources (Google Workspace vs Microsoft 365), and the scope (comparable plans, a user count, one country). An agent can tell this apart from generic siblings like estimate_saas_cost, though it never explicitly contrasts with them.

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 only implied: the description makes clear this is for two-vendor comparison at a given seat count and country, but it gives no explicit when-to-use versus estimate_saas_cost, no prerequisites, and no exclusions.

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