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

Annotations already declare readOnlyHint/idempotentHint/destructiveHint, so the safety profile is covered; the description adds a genuinely useful behavioral fact beyond them — the call is free and does not consume a review. It also hints at the payload ('how many used and how many left'), though it does not describe return format or whether counts reset.

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?

Two short sentences with no filler, front-loaded with the action and resource; the cost caveat follows immediately.

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 no-parameter, read-only quota check with annotations covering safety, the description supplies enough: what it returns conceptually and that it costs nothing. Only minor gaps remain (no output schema, no statement of reset period or whether counts are per-account).

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?

Zero parameters, so the baseline is 4; there is nothing for the description to document. No account identifier is shown in the schema, which the description also does not address, but this tool takes no 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?

States a specific verb+resource ('Check ... Rams reviews ... used / left') that is unambiguous against siblings like quick_review and review_url, which consume reviews. The final sentence 'It does not use a review' explicitly separates this quota tool from the review-performing 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?

'Free to call. It does not use a review' gives a clear condition for when this is the right, low-cost choice versus the review-consuming siblings. It stops short of naming an alternative or stating a recommended ordering (e.g. check before reviewing), so it is clear context without explicit routing.

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