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tax-retirement

by io.github.herve-coulon
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fiscal_foncier_regime

Read-onlyIdempotent

Location nue : micro-foncier ou régime réel — Arbitrage du régime des revenus fonciers d'une location NUE : micro-foncier (abattement 30 %, loyers ≤ 15 000 €) vs régime réel (charges, intérêts, déficit imputable plafonné). Gain = Δ d'impôt TOTAL du foyer (IR au barème avec quotient familial + prélèvements sociaux 17,2 %), pas loyers × TMI. Même calcul que l'étude patrimoniale (cOptiFoncier). Au-delà de 15 000 € de loyers, le réel est obligatoire : pas d'arbitrage. Pour une location MEUBLÉE, utiliser fiscal_lmnp_regime. (sources: CGI art. 32 (micro-foncier) ; CGI art. 28 à 31 (régime réel) ; CGI art. 156-I-3° (déficit foncier) ; LFSS 2026 art. 12 (PS 17,2 % foncier))

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
partsNoNombre de parts de quotient familial.
loyersYesLoyers bruts annuels de la location nue (€).
chargesNoCharges déductibles au réel (€/an), hors intérêts.
interetsNoIntérêts d'emprunt (€/an).
situationNoSituation familiale (plafonnement du quotient familial).Célibataire
parent_isoleNoParent isolé (case T, art. 194 II CGI) : célibataire ou divorcé vivant seul avec au moins un enfant à charge. La part du 1er enfant est alors plafonnée à 4 262 € (art. 197 I-2) au lieu de 2 × 1 807 €. Les parts transmises doivent déjà inclure la demi-part case T.
demi_parts_195_abeNoDemi-parts de l'art. 195-1 a, b ou e CGI (personne vivant seule ayant élevé seule un enfant 5 ans, enfant décédé, enfant adopté) incluses dans les parts : plafonnées à 1 079 € chacune.
residence_alterneeNoAvec parent_isole : enfants UNIQUEMENT en résidence alternée — la demi-part de chacun des deux premiers enfants est plafonnée à 2 131 € (art. 197 I-2 CGI). Les parts transmises doivent inclure les majorations de 0,25 (art. 194 I).
demi_parts_invaliditeNoDemi-parts d'invalidité ou d'ancien combattant (art. 195-1 c, d, d bis, f et 195-2 à 6 CGI) incluses dans les parts : plafond de droit commun + réduction de 1 801 € chacune quand le plafonnement joue.
revenu_net_imposable_horsYesRevenu net imposable du foyer HORS ces loyers (€).

Schema Changelog

Changes observed during successful MCP inspections.

  1. Added

TDQS

A4.6/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and openWorldHint=false, covering safety and determinism. The description adds meaningful behavioral context: the result is the total household tax delta (IR + 17.2% social levies), not a simple loyers × TMI multiplication, and it cites the exact legal basis. It does not describe output format or edge cases, so it stops short of the highest bar.

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 a single dense paragraph that front-loads the core arbitrage purpose before drilling into calculation details, thresholds, alternatives, and sources. Every sentence contributes necessary context for a complex tax tool, with no wasted filler.

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

Completeness4/5

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

Given a 10-parameter tool with no output schema and high complexity, the description covers purpose, usage, alternatives, threshold rules, and calculation basis. It even hints at the return value ('Gain = Δ d'impôt TOTAL...'), but it does not specify the output structure or all returned fields, leaving a minor gap for an agent expecting to interpret results.

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

Parameters4/5

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

Schema coverage is 100% and each parameter has a detailed legal description, so the baseline is 3. The description adds parameter-relevant meaning by tying the loyers parameter to the 15,000 € micro-foncier threshold and the mandatory réel regime beyond it, and by summarizing how charges, intérêts, and déficit are used in the réel calculation. This goes beyond what the schema alone states.

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 states a specific verb and resource: 'Arbitrage du régime des revenus fonciers d'une location NUE : micro-foncier ... vs régime réel.' It explicitly distinguishes from the sibling fiscal_lmnp_regime for furnished rentals, so an agent can identify the tool's scope without opening the schema.

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

Usage Guidelines5/5

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

It gives explicit when-to-use ('micro-foncier ... vs régime réel'), when-not ('Au-delà de 15 000 € de loyers, le réel est obligatoire : pas d'arbitrage'), and the alternative for a different case ('Pour une location MEUBLÉE, utiliser fiscal_lmnp_regime'). This is complete routing guidance.

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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