list_billing_traffic_by_period

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

With no annotations, description discloses the monthly constraint and the need for permission for ranges. Lacks details on permissions, rate limits, or result format, but the single-month constraint is well communicated.

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?

Very concise: three sentences covering purpose, constraint, and optional output format. No redundant or missing information. Each sentence earns its place.

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, description does not describe return data structure. It mentions 'network traffic data' and FOCUS output but lacks details on fields, pagination, or size. Adequate for a simple list tool but could be more complete.

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 100%, baseline is 3. Description adds value by specifying 'contract number from get_billing_profile' and reiterating period format with example. Does not significantly expand beyond schema.

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?

Description clearly states 'Get network traffic data for a specific billing period (YYYY-MM)', specifying verb, resource, and constraint. Distinguishes from sibling 'list_billing_traffic' by including period parameter and monthly limitation.

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?

Explicitly says 'One month per call' and provides clear instruction on handling longer ranges: calculate number of calls, inform user, ask permission. Also mentions FOCUS v1.3 output reference, giving additional context.

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