add_subscription_rate_plan

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

No annotations provided. Description does not disclose behavioral traits such as side effects, permissions required, idempotency, or error handling. The brief statement 'Add a rate plan to a subscription' lacks details on what the operation does to the subscription state.

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?

The description is a single paragraph but is reasonably concise and covers the endpoint, required/optional fields, and the complex charge parameter. It could be more structured (e.g., bullet points) but is efficient.

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, the description lacks information about the return value (e.g., the created rate plan object). It explains the input parameters well but does not specify what the agent can expect after successful execution, such as the rate plan ID or updated subscription.

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%, and the description adds value by explaining the structure of the 'ratePlanCharge' array (e.g., 'each { quantity, optional productRatePlanChargeId, or chargeTier }'), which goes beyond the schema's property 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?

Description clearly states 'Add a rate plan to a subscription' and provides the HTTP endpoint POST /subscriptions/{subscriptionId}/rateplans. This distinct verb+resource is differentiated from the sibling tool 'add_subscription_rate_plan_charge', which adds charges to an existing rate plan.

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?

Description lists required and optional parameters but does not specify when to use this tool versus alternatives like 'add_subscription_rate_plan_charge' or other subscription modification tools. No explicit guidance on prerequisites or conditions.

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