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fec-lint

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Technical check, not tax advice. fec-lint checks the structure of a file against the published FEC format. It does not certify a file or replace an accountant's review.

Contrôle technique, pas un conseil fiscal. fec-lint vérifie la structure d'un fichier au regard du format FEC publié. Il ne certifie pas un fichier et ne remplace pas la revue d'un expert-comptable.


English

Free structural linter for French FEC files (Fichier des Écritures Comptables, art. A47 A-1 LPF), as a command line tool and an MCP server.

Install

pipx install fec-lint

Command line

fec-lint 123456782FEC20251231.txt
123456782FEC20251231.txt: FAILED (encoding utf-8, separator pipe, lines 214)
  error date_invalid x3: Non-existent date in EcritureDate. - line(s) 21, 22, 23
  error date_format x3: Wrong date format in EcritureDate (expected AAAAMMJJ). - line(s) 64, 65, 66
Structure has errors. Full pre-audit (balance, numbering, risk signals): https://apify.com/highfiddle/fec-checker
  • --json prints the full result: {ok, file, errors[], warnings[], stats}.
  • --name 123456782FEC20251231.txt sets the name checked against SIRENFECAAAAMMJJ.txt.
  • --quiet hides the last line.
  • Exit code: 0 when the structure is OK, 1 on errors, 2 when a file cannot be read. Several files can be given at once.
  • A .zip holding exactly one .txt FEC is unpacked first.

MCP server

Add it to your MCP client (Claude Desktop, Claude Code, Cursor…):

{
    "mcpServers": {
        "fec-lint": {
            "command": "uvx",
            "args": ["--from", "fec-lint", "fec-lint-mcp"]
        }
    }
}

Without uv, install with pipx install fec-lint and use "command": "fec-lint-mcp". The server exposes one tool, lint_fec(path), which takes a local file path and returns the same JSON as --json.

Full pre-audit as a hosted MCP server. The paid FEC Checker (balance, numbering, risk signals, AI fix list) runs on Apify and is reachable over MCP. Users sign in with Apify OAuth; agents can pay with x402 by adding &payment=x402:

claude mcp add --transport http fec-checker "https://mcp.apify.com/?tools=highfiddle/fec-checker"

Free vs full pre-audit

Check fec-lint (free) FEC Checker on Apify
File name SIRENFECAAAAMMJJ.txt, SIREN key ✅ ✅
Encoding, separator, 18 headers ✅ ✅
Field formats: dates, amounts, mandatory fields, pairs ✅ ✅
Balance per entry and for the whole file — ✅
EcritureNum gaps and duplicates, ValidDate chronology — ✅
Risk signals: weekends, holidays, round amounts, Benford, cash 53x, suspense 471, after year end — ✅
Verdict, 0-100 score, AI-written fix list (FR/EN) — ✅
Runs locally, nothing leaves your machine on Apify, pay per file

Français

Linter structurel gratuit pour les FEC (Fichier des Écritures Comptables, art. A47 A-1 LPF), en ligne de commande et en serveur MCP.

Installation

pipx install fec-lint

Ligne de commande

fec-lint 123456782FEC20251231.txt
  • --json affiche le résultat complet : {ok, file, errors[], warnings[], stats}.
  • --name 123456782FEC20251231.txt indique le nom à contrôler selon SIRENFECAAAAMMJJ.txt.
  • --quiet masque la dernière ligne.
  • Code de sortie : 0 si la structure est correcte, 1 en cas d'erreur, 2 si un fichier est illisible. Plusieurs fichiers peuvent être passés à la fois.
  • Un .zip contenant un seul FEC .txt est décompressé d'abord.

Les messages sont en anglais ; les codes de règle (date_invalid, header_missing…) sont stables.

Serveur MCP

Ajoutez-le à votre client MCP (Claude Desktop, Claude Code, Cursor…) avec la configuration ci-dessus. L'outil lint_fec(path) prend le chemin d'un fichier local et renvoie le même JSON que --json.

Pré-audit complet en serveur MCP hébergé. Le FEC Checker payant (équilibre, numérotation, signaux de risque, plan de correction IA) tourne sur Apify et s'utilise en MCP via https://mcp.apify.com/?tools=highfiddle/fec-checker (connexion Apify OAuth ; les agents peuvent payer en x402 avec &payment=x402).

Gratuit ou pré-audit complet

Contrôle fec-lint (gratuit) FEC Checker sur Apify
Nom SIRENFECAAAAMMJJ.txt, clé du SIREN ✅ ✅
Encodage, séparateur, 18 colonnes ✅ ✅
Formats : dates, montants, champs obligatoires, couples de champs ✅ ✅
Équilibre par écriture et du fichier — ✅
Ruptures et doublons d'EcritureNum, chronologie de ValidDate — ✅
Signaux de risque : week-ends, jours fériés, montants ronds, Benford, caisse 53x, attente 471, après clôture — ✅
Verdict, score 0-100, plan de correction rédigé par IA (FR/EN) — ✅
Exécution en local, rien ne quitte votre machine sur Apify, paiement par fichier

Development

python -m venv .venv
.venv/bin/pip install -e ".[test]"   # Windows: .venv\Scripts\pip
pytest

The fixtures in tests/fixtures/ are synthetic FEC files (fictitious SIREN 123456782). MIT license.

Metadata

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