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

Annotations already declare destructiveHint=true, idempotentHint=true and openWorldHint=true, so the safety profile is covered. The description adds genuinely non-obvious behavior: the 65-day scheduling horizon and that deletion is effectively temporary because the attempt gets regenerated. It stops short of saying what happens if the attempt was already processed (error type).

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 tightly packed sentences, with the WRITE marker and the core action front-loaded before the durability caveat and the sibling pointer. No sentence is filler.

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?

With a rich annotation set and no output schema, the description covers action, precondition, side effect and alternative. Minor remaining gap is failure behavior for an already-processed attempt.

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% and both parameters carry precise descriptions, including that subscription_id is the `id` and not `internal_id` and where billing_attempt_id comes from. The description adds no parameter-level detail, 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?

States a specific verb and resource ('Delete a billing attempt') plus a scope precondition ('that has not been processed') and even names the endpoint. It is clearly distinct from reschedule_billing_attempt, which it references, though the difference from skip_billing_attempt is left implicit.

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?

Gives an explicit when-not path: deleting is not durable because Seal recreates the attempt within hours, so the schedule must be moved first via sealsubscriptions_reschedule_billing_attempt. The agent is routed to the correct alternative with the condition that selects it.

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