Get Service Cost Breakdown

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

With no annotations, the description must bear full weight for behavioral disclosure. It indicates the tool provides detailed breakdown including usage and SKU info, but does not mention read-only nature, pagination, or potential limitations. Adequate but not thorough.

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, clear sentence with no unnecessary words. It front-loads the key action and resource, making it efficient and easy to parse.

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?

Given no output schema and moderate parameter count, the description could be more complete. It does not explain return format, error handling, or default behavior for optional parameters. Acceptable but leaves 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 the baseline is 3. The description adds that results include usage and SKU information, which is not in the schema, providing slight additional meaning beyond the parameter descriptions.

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 clearly states the tool retrieves a cost breakdown by Google Cloud service with usage and SKU information. It effectively communicates the purpose but does not explicitly differentiate from sibling billing tools like gcp-billing-analyse-costs.

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?

No guidance is provided on when to use this tool versus alternatives, nor any prerequisites or exclusions. The description implies usage for service-level breakdown but lacks explicit when-to-use/when-not-to-use context.

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