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tresor4k

macalc

calculate_savings_goal

Compute the months to achieve a savings goal based on target amount, monthly contribution, and annual return rate. Ideal for personal finance planning.

Instructions

Compute time and monthly contribution needed to reach a savings target. Use for goal-based personal finance. Inputs: target amount, current savings, monthly contribution, annual return %. Returns months to goal. See list_bundles for related 'finance-universal' calculators.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
target_amountYesSavings target EUR
monthly_savingsYesMonthly savings EUR
annual_rateYesAnnual return rate percent

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultNoComputed result. Object whose fields depend on the tool (e.g. {tax, marginal_rate, brackets} for tax tools, {volume_l, gallons} for volume tools).
formulaNoHuman-readable formula or method used (e.g. "I=P·r·t", "Magnus formula").
sourceNoAuthoritative source for the rule or formula (e.g. "Article 197 CGI", "NF DTU 21").
reference_urlNoLink to a calcul2 page documenting the calculation in detail.
Behavior2/5

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

With no annotations provided, the description fails to disclose behavioral traits such as the compounding frequency assumption or that it computes only months to goal given monthly savings, not vice versa. The mention of 'current savings' further misleads.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise with two sentences, but the inclusion of 'current savings' creates confusion and disrupts clarity. It is adequately structured but could be more precise.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the complexity of a financial calculator and the existence of an output schema (not shown), the description lacks details on calculation assumptions (e.g., compounding frequency) and the input schema mismatch reduces completeness.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the schema already describes each parameter. The description adds a narrative of inputs but includes an extra parameter (current savings) not in the schema, and does not provide additional meaning beyond what the schema offers.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool computes time and monthly contribution for a savings target, using verbs like 'Compute' and specifying 'goal-based personal finance'. However, it mentions 'current savings' as an input, which is not present in the schema, causing confusion.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description suggests using this tool for goal-based personal finance and references 'list_bundles' for related calculators, but it does not explicitly state when to avoid it or compare with similar sibling tools.

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

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