google_activate_subscription_base_plan

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

With no annotations, the description carries full burden; it usefully discloses the DRAFT→ACTIVE lifecycle and that activation gates purchasability. It does not disclose permission requirements, idempotency (what happens if already ACTIVE), failure modes for unknown basePlanId, or whether an edit/commit is involved.

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 tight sentences with zero filler; the state-transition purpose is front-loaded and the lifecycle rationale follows immediately.

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?

For a simple 3-required-param mutation with no output schema, the description gives the essential lifecycle context an agent needs to pick and call it. It could reasonably add what the call returns (e.g., the updated base plan) and error behavior, but the core is covered.

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?

All three parameters (packageName, productId, basePlanId) are already documented at 100% schema coverage, so the description does not need to explain them. It adds no format hints or constraint notes beyond the schema, so baseline 3 applies.

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 pairs a specific verb (Activate) with a specific resource (subscription base plan) and states the resulting outcome ('becomes purchasable'), so an agent knows exactly what state change occurs. It is clearly distinguishable from the deactivate sibling by the direction of the transition.

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 states the condition that selects this tool: base plans are DRAFT after creation and this call is required to make them ACTIVE/purchasable. What is missing is any explicit mention of the inverse sibling (google_deactivate_subscription_base_plan) or other prerequisites such as the subscription product already existing.

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