MaCalculatriceEnLigne

calculate_housing_loan_comparison

Compare multiple mortgage offers sorted by total cost. Returns: {offers_count, best_offer, comparison}. See list_bundles for related 'immobilier' calculators.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`offers`	Yes	List of mortgage offers to compare
`loan_amount`	Yes	Loan amount in EUR

Output Schema

TableJSON Schema

Name	Required	Description
`result`	No	Computed result. Object whose fields depend on the tool (e.g. {tax, marginal_rate, brackets} for tax tools, {volume_l, gallons} for volume tools).
`source`	No	Authoritative source for the rule or formula (e.g. "Article 197 CGI", "NF DTU 21").
`formula`	No	Human-readable formula or method used (e.g. "I=P·r·t", "Magnus formula").
`reference_url`	No	Link to a calcul2 page documenting the calculation in detail.

Schema Changelog

Changes observed during successful MCP inspections.

First observedJul 13, 2026

TDQS

A4.1/5.0

Behavior3/5

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

With no annotations, the description carries the burden of behavioral disclosure. It mentions the output structure (offers_count, best_offer, comparison) and sorting behavior. However, it does not discuss auth needs, rate limits, or potential side effects, though the tool likely involves no destructive actions.

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

Conciseness5/5

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

The description is concise with two sentences. The first sentence states the core purpose and output, and the second provides a pointer to related tools. No redundant information.

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

Completeness5/5

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

Given the tool's moderate complexity (comparing multiple offers with an output schema), the description sufficiently covers what the tool does, its output fields, and where to find related calculators. It is complete for an agent to understand usage.

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?

The input schema has 100% coverage with descriptions for both parameters, so the baseline is 3. The description adds no extra semantic value beyond the schema, as it only repeats 'compare' and does not detail parameter usage or constraints.

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

Purpose5/5

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

The description clearly states the tool compares multiple mortgage offers and sorts them by total cost, specifying the verb 'compare' and the resource 'mortgage offers'. It also distinguishes from siblings by referencing 'list_bundles' for related calculators.

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

Usage Guidelines4/5

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

The description indicates when to use the tool (to compare mortgage offers) and points to 'list_bundles' for related calculators, providing some guidance. However, it does not explicitly state when not to use this tool or alternative scenarios.

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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