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

With no annotations, the description carries the full behavioral burden. It discloses that this is a live status read and that access is free, and it names the returned metrics, but it does not state authentication requirements, rate limits, data freshness, or caching behavior.

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 front-loaded sentence that identifies the resource, the returned fields, and the cost. Every clause earns its place with no redundant or filler content.

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?

An output schema exists, so the description need not explain return values, and it still helpfully lists the key live metrics. It covers scope and cost, but does not address freshness or access assumptions for a status endpoint, leaving a minor completeness gap.

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 rubric baseline is 4. The description appropriately does not invent parameter details, and the empty input schema is self-contained.

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 states a specific verb and resource: live status of the zkAPI private-payments rail on Base. It enumerates the exact metrics returned (tree depth, nullifier ledger length, minimum query price, receiver, uptime), so an agent can identify the tool without opening the schema.

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?

The description implies monitoring/health-check usage through 'Live status' and notes the tool is 'Free', but it gives no explicit when-to-use, when-not-to-use, or alternative-tool guidance. Nothing routes the agent against related siblings such as zkapi_get_kit or zkapi_pay_privately_info.

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