calculate_monthly_cost

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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and closed-world, so the safety profile is covered. The word 'estimated' usefully signals this is a projection rather than a firm quote, but the description discloses nothing about default assumptions (e.g., 730 hours) or pricing caveats, so it adds only marginal behavioral context.

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 with no filler; the cost scope is stated immediately. It is lean, though for a tool this structurally complex it borders on under-specification rather than true completeness.

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 tool takes five nested object parameters with a 20% schema coverage and no output schema. For that complexity the description omits the estimate methodology, default assumptions, and what the response contains, leaving the agent without enough to interpret results confidently.

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 coverage is only 20% and several nested properties (storage, networking) carry no schema descriptions. The description's enumeration of compute/storage/database/networking maps to the top-level objects but adds no units, defaults, or optionality, so it does not compensate for the coverage gap.

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?

States a specific verb (calculate) and resource (estimated monthly cost) and scopes it to compute, storage, database, and networking. This scope implicitly distinguishes it from the per-component siblings like calculate_database_cost and calculate_networking_cost, but no sibling is named to make the boundary explicit.

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 when-to-use, when-not-to-use, or alternative routing. Given a sibling set full of overlapping calculators (calculate_database_cost, calculate_storage_cost, quick_estimate), the description never tells the agent when this all-in-one should be preferred over those.

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