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

Annotations already flag destructiveHint=true, idempotentHint=true and openWorldHint=true, yet the description adds genuinely new scope information: atomic per-run and total limits enforced by native grants, plus explicit exclusions of purchases, auto-reload, ad spend and transfers. It does not say what the destructive aspect entails (e.g., money movement or what state is irrevocably changed) or how expiry and revocation behave in practice.

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?

Three tight sentences, front-loaded with the action and its constraint, followed by enforcement guarantees and hard exclusions. Every sentence carries distinct information with no restatement of the name or title.

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 destructive, open-world mutation with an output schema present, the description covers preconditions and the safety envelope well. The remaining gap is 'request_key' semantics and what the caller should expect on retry, which is partially covered by the idempotent hint but not in words.

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 0%, so the description must carry both parameters. It clarifies that 'proposal_id' refers to the human-approved finite proposal, but 'request_key' (an idempotency key) is never explained in the description, leaving half the parameters undocumented anywhere.

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 verb 'Activate' is specific and the object is 'the exact human-approved finite proposal,' which reads as a prepared recurring schedule. It leans on the title to say 'recurring schedule' explicitly, but an agent can still distinguish this from prepare/pause/revoke siblings.

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?

'Activate only the exact human-approved finite proposal' sets a clear precondition: the proposal must already exist and have human approval, implicitly pointing at prepare_recurring_schedule. It never names the pause/revoke siblings or states when-not to call it (e.g., already-active schedules), so it falls short of full alternative routing.

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