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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered; the description goes further by disclosing that the call is free and not counted against the quota, and that the answer is identical for an API key and a connected account. Those are non-obvious behavioral facts an agent could not infer from annotations or schema, and they directly affect whether the agent should call it liberally.

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 returned data is front-loaded in the first clause, followed by the quota-exemption note and a short usage hint. Two sentences plus a fragment, with no filler or repetition that does not carry information.

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 zero-parameter, read-only, idempotent status tool with an output schema present, the description covers what it returns, when to reach for it, and its cost model. Nothing an agent needs in order to call it correctly is missing, and the field enumeration is a reasonable convenience even though the output schema also documents the return shape.

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 there is nothing for the description to disambiguate; the baseline for a no-parameter tool applies. The enumerated fields in the description describe outputs rather than inputs, which is harmless but not parameter semantics.

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 concretely what the tool returns: plan, calls used, calls remaining, per-minute rate, page-size and pagination caps, and the reset time. That is a specific resource with enumerated fields, not a restatement of the name. It does not explicitly contrast itself with the sibling tools (all domain-data tools like get_entity or search_tenders), though the difference is fairly self-evident.

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?

"Useful for sizing a long job" gives a concrete situation in which to call it, and the note that the call is free gives a reason to prefer calling it early. There is no explicit when-not-to-use or named alternative, but for a zero-parameter meta tool the context is clear enough.

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