See my spending limits

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

The annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds useful scope by listing the policy information and today/month usage that will be returned, but it does not describe return format, timing, authentication needs, or any other behavioral traits beyond that content list.

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?

The description is a single well-formed sentence that front-loads the tool's purpose and uses a compact list to enumerate the relevant policy areas. Every part of the sentence contributes information and there is no 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?

Given that the tool has no parameters, no output schema, and annotations that establish it as a safe read-only operation, the description is largely complete. It explains what policy areas and usage periods are reported, though it could explicitly connect this tool to the payment-related sibling tools.

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 and the schema is empty, so there is no parameter semantics to clarify. The baseline for zero parameters is 4, and the description does not create confusion about 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?

The description clearly identifies the resource and contents: spending policy, usage today and this month, limits, allowed recipients, approval rules, and working hours. It lacks an explicit verb and does not name the sibling tools, but an agent can still distinguish it from check_payment and request_payment.

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?

There is no explicit when-to-use guidance, no when-not-to-use guidance, and no named alternatives. The description only implies that an agent might inspect policy limits before making a payment, leaving the routing decision to inference.

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