Create subscription

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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=true, so "WRITE:" adds nothing. Beyond that, the description says nothing about side effects, whether creation is idempotent, what happens on validation failure, or what the response contains — meaningful gaps for an open-world mutation tool.

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?

Two short clauses, front-loaded in the right order (operation, then prerequisite). It is efficiently sized but that efficiency comes from omission rather than discipline — there is essentially no content after the verb.

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?

The tool has a nested untyped payload, no output schema, and mutates state in an open-world system, yet the description provides no payload guidance and no return-value expectations. Two clauses referencing prerequisite tools do not cover what an agent needs to construct a valid SubscriptionAccount.

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 reported at 100%, so the baseline of 3 applies. However the single parameter is a nested free-form object with additionalProperties {}, and the description gives no hint at the payload's shape or required fields, so it fails to compensate for a schema that is 100% covered but substantively empty.

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?

"CreateSubscription" merely restates the tool name, and "WRITE:" only re-declares the mutation annotation already present. The description never says what a subscription is being created for, its scope, or what distinguishes it from sibling creation tools like create_company or create_reseller.

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?

It does give a concrete prerequisite workflow — call get_fields_for_service and validate_subscription_fields first — which is genuine routing value. But it never states when to create a new subscription versus using update_subscription, get_subscription_fields_for_upgrade, or execute_subscription_upgrade, so the boundary with siblings is left to inference.

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