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

Annotations already cover read-only, idempotent, and non-destructive behavior, so the bar is lower. The description adds real context beyond them: the result is scoped to the caller's network address, and the payload is identical to GET /api/limits, which helps the agent predict the response shape.

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?

A single sentence that front-loads the primary return value (remaining registration quota) before the secondary one. No filler, no restatement of the tool 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?

With no output schema and no parameters, the description carries the burden of describing the return, and it does so reasonably by enumerating the two content groups and mapping to the REST equivalent. It could be slightly more explicit about response fields, but it is sufficient for a zero-arg read tool.

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 baseline is 4. There is nothing in the schema for the description to clarify, and the description appropriately avoids inventing parameter behavior.

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 ('Report') and a concrete resource ('remaining registration quota' and 'other configured posting limits'), which clearly separates it from siblings like credit_check or check_claim. It does not, however, explicitly name a sibling it should be preferred over or state its scope relative to them.

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 explains what is returned but gives no when-to-use guidance, no prerequisites, and no alternatives among the many sibling tools (credit_check, check_claim, get_rules). An agent must infer that this is a pre-registration/post quota check.

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