Create subscription

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

Annotations already convey mutation (readOnlyHint=false) and non-idempotency. The description adds the workflow context and notes productId is permanent, which is also in the schema. No extra behavioral traits beyond the annotations and schema are disclosed.

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 two sentences, front-loaded with the primary purpose, and includes a useful workflow hint without any wasted words.

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?

Despite having 7 parameters and no output schema, the description covers the essential workflow and points to next steps. The schema handles parameter details, and the annotations cover safety. A bit more detail on return value or prerequisites could push it higher, but it's sufficiently complete for selection and invocation.

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%, so the schema documents all parameters. The description only mentions productId and name as required, and the workflow hint about localizations/prices does not add semantic detail beyond what the schema already provides.

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 creates an auto-renewable subscription in a subscription group, using specific verbs and resources. It also distinguishes from sibling tools like create-subscription-group and create-subscription-localization by implying the primary creation step.

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 provides clear workflow guidance: requires productId and name, then add localizations and prices with named sibling tools. It does not explicitly state prerequisites like needing an existing subscription group, but the schema and sibling context imply this.

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