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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful domain constants (€10 core, €5 fuel over a 28-week season, €3 living alone, €6 per child, Child Benefit frozen at €140), which go beyond annotations. However, it does not state what the returned figure represents (weekly vs monthly vs annual delta) or how the boolean flags combine, leaving the core behavior half-disclosed.

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 that names the scope first and then enumerates the rate changes with no filler. Every clause carries a number an agent would otherwise lack.

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 read-only, no-output-schema calculator with fully documented parameters, the description supplies the rate table needed to interpret results. The one remaining gap is that it never specifies the unit and scope of the returned value (per week, per month, or summed across the year), which matters given components use different periods (weekly vs 28-week season vs monthly Child Benefit).

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 each of the five parameters is already documented in the schema and the baseline is 3. The description adds marginal meaning by stating Child Benefit is 'unchanged at €140', which signals that the 'children' parameter contributes nothing to the delta while 'cspChildren' does — a useful disambiguation, but no per-parameter semantics beyond that.

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 opening clause 'the extra a household gets in social welfare from January 2027 under Budget 2027' states the resource (extra welfare amount) and the time scope (from Jan 2027) clearly. It reads as a calculator of the delta rather than the total payment, which distinguishes it implicitly from siblings like ireland_what_can_i_claim or ireland_fuel_allowance, but no sibling is named to make the boundary explicit.

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 never says when to use this tool versus the many overlapping siblings (ireland_what_can_i_claim, ireland_fuel_allowance, ireland_carers_allowance, ireland_working_family_payment). There are no stated preconditions, exclusions, or alternative routing, so the agent must infer usage from the name alone.

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