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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description adds genuinely new behavior: public pricing facts are free to read, while payment always requires a human to open and confirm a Stripe-hosted Checkout URL — important context that no annotation conveys.

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 sentences, front-loaded with the core action, with no filler. The second sentence is slightly tangential to a read tool but earns its place by pre-empting an attempt to pay through this call.

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?

Annotations cover safety and an output schema exists, so return values need not be explained. However, the description leaves ambiguity about what "alerts price" actually comprises versus a plan, which matters given siblings get_plan and get_subscription_status.

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?

The tool takes zero parameters, so the baseline is 4. The description correctly implies a parameterless, context-free read and does not mislead about any inputs.

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?

"Read the current configured alerts price" gives a verb and a resource, but the resource is fuzzy: it is unclear whether this returns a plan price, tier list, or a single configured amount. It also does not distinguish itself from close siblings like get_plan and get_subscription_status, which an agent could easily confuse with a pricing read.

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?

"Public facts are free" implies this call needs no authentication and is safe to invoke liberally, and the Stripe sentence implies payment is out of scope for this tool. But the actual alternative (create_checkout_link) is never named, and there is no explicit statement of when to prefer get_plan or get_subscription_status instead.

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