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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint=false, so safety is covered. Beyond that, the description supplies substantive domain behavior: the 7.5%/14.25% split, the JOD 3,733 ceiling and the JOD 5,000 legacy ceiling, plus a worked example. It does not state what the response actually contains, which keeps it from a 5.

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?

Three compact sentences front-loaded with the rate/example, which is the highest-value information, followed by the ceiling rule and a reference URL. No filler, though the promotional URL is the only marginal sentence.

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 two-parameter calculator with no output schema and full annotation coverage, the description provides the rates, ceilings, and a worked example that implies the return values. It could go slightly further by stating explicitly what the tool returns (employee share, employer share, total), but nothing an agent needs to call it correctly is missing.

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?

Schema coverage is 100%, so the baseline is 3; the description earns extra by giving the consequence of the 'covered' enum ('JOD 5,000 if covered before May 2010') and showing how wage maps to concrete contribution amounts (JOD 60 + JOD 114). This adds meaning beyond the schema's terse parameter text.

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 concrete example ('a JOD 800 wage costs JOD 60 + JOD 114 a month') makes clear this computes Jordanian social-security employee/employer contributions, and the country scope is unambiguous. It never states the verb explicitly ('calculates') nor distinguishes itself from the generic social_security_calculator or egypt_social_insurance_calculator siblings, so it stops short of a 5.

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 when-to-use or when-not-to-use guidance and no mention of alternative sibling tools (e.g. the generic social_security_calculator). The closest thing to guidance is the note that the higher ceiling applies to those covered before May 2010, which is implied usage at best.

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