add_subscription_rate_plan

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

Without annotations, the description should disclose behavioral traits such as side effects or required permissions. It only states the action and parameters, omitting details like whether it modifies subscription status, triggers billing, or is reversible.

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 concise, combining a purpose statement with a parameter list in a single sentence. It is front-loaded with the action and endpoint, though it could be better structured (e.g., bullet points) for clarity.

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 the tool's complexity (7 parameters, no output schema, no annotations), the description lacks context about post-addition effects, return values, or implications for the subscription. It fails to provide a complete picture for an AI agent to use correctly.

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?

Since schema coverage is 100%, the baseline is 3. The description adds minor value by explaining the required 'productRatePlanId' and briefly describing 'ratePlanCharge' structure, but does not significantly expand on parameter meanings beyond the 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?

The description clearly states the action ('Add a rate plan to a subscription') and includes the HTTP endpoint, making the purpose unambiguous. It distinctively differs from sibling 'add_subscription_rate_plan_charge' by focusing on adding a rate plan itself.

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?

The description only lists parameters and does not provide guidance on when to use this tool versus alternatives like 'add_subscription_rate_plan_charge' or 'update_subscription_rate_plan'. No when-not conditions or prerequisites are mentioned.

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