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

Annotations already establish this is a safe, closed-world read (readOnlyHint=true, openWorldHint=false), so the description only needs to add operational context. It adds that amounts are estimates based on official 2026/2027 rates, which usefully sets precision expectations, but says nothing about how results degrade when the twelve optional inputs are omitted — a meaningful behavior gap.

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 front-loaded sentence with the scope stated first and the covered schemes and rate years as supporting detail; the parenthetical list is long but earns its place by telling the agent what is and isn't covered. No boilerplate or redundancy.

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 12-parameter, all-optional aggregator with no output schema, the description should explain default behavior when inputs are missing and roughly what the response contains (per-scheme eligibility plus estimated amount). It covers coverage and rate years but leaves the omitted-parameter behavior and return shape unstated.

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 description coverage is 100%, so every parameter (pay1, pay2, savings, prsiYears, hoursFortnight, etc.) is already self-documented, setting the baseline at 3. The description adds no interpretation beyond the schema — for example, it does not explain that hoursFortnight is combined across the household or how pay1/pay2 are assessed relative to the couple flag.

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 gives a specific verb ('list') and resource ('social welfare payments and tax credits a household may get') and enumerates the covered schemes with amounts and reference years, so an agent knows precisely what comes back. It stops short of a 5 because it never explicitly distinguishes itself from the sibling single-scheme tools (ireland_carers_allowance, ireland_fuel_allowance, ireland_rent_tax_credit, etc.).

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?

Usage is only implied by the 'what can I claim' framing — an agent can infer this is the broad eligibility sweep. There is no statement of when to prefer it over the individual scheme tools or over ireland_budget_2027_take_home, and no guidance on what inputs are needed to get a meaningful answer.

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