Sources DGFiP (langage M)  →  Mlang (OCamlPro/DGFiP)  →  C (~55 Mo)  →  irpp_calc
                                                                           ↓
                                                                    irpp_mcp.py (MCP)
                                                                           ↓
                                                                      Claude Code

~/impots/
├── calculette-ir-master/           ← sources DGFiP téléchargées (étape 1)
│   └── sources2023m_8_0/
├── mlang-src/                      ← compilateur Mlang cloné (étape 2)
│   ├── _build/default/src/main.exe
│   ├── m_ext/2023/
│   └── examples/dgfip_c/ml_primitif/c_driver/
│       └── irdata.c
├── output/                         ← C générés (étape 3) + binaire (étape 4)
│   ├── irpp_driver.c               ← fourni dans ce repo
│   ├── Makefile                    ← fourni dans ce repo
│   └── irpp_calc                   ← binaire compilé
└── irpp-mcp/                       ← ce repo (cloné en premier)
    └── irpp_mcp.py

mkdir ~/impots && cd ~/impots
git clone https://github.com/erwanpaccard/irpp-mcp.git

mkdir -p ~/impots/output
wget https://github.com/erwanpaccard/irpp-mcp/releases/download/v1.0.0/irpp_calc \
     -O ~/impots/output/irpp_calc
chmod +x ~/impots/output/irpp_calc

# Tester
printf "V_0AC=1\nTSHALLOV=50000.00\n" | ~/impots/output/irpp_calc
# → {"IINET": 6786.00, "NBPT": 1.00, "RNI": 45000.00, ...}

cd ~/impots
curl -L "https://gitlab.adullact.net/dgfip/impots-nationaux-revenu-patrimoine-particuliers/calculette-ir/-/archive/master/calculette-ir-master.zip" \
     -o calculette-ir-master.zip
unzip calculette-ir-master.zip

cd ~/impots
sudo apt install libgmp-dev libmpfr-dev git opam bubblewrap unzip bzip2 patch

git clone https://gitlab.adullact.net/dgfip/impots-nationaux-revenu-patrimoine-particuliers/Mlang.git mlang-src
cd mlang-src

# Correctif obligatoire (version non substituée dans les fichiers opam)
sed -i 's/%%VERSION%%/0.0.1/g' mlang.opam irj_checker.opam

OPAMYES=1 make init
make build

cd ~/impots/mlang-src
eval $(opam env --switch=$(pwd) --set-switch)

./_build/default/src/main.exe \
  -A iliad \
  --display_time \
  --precision double \
  --mpp_function=enchainement_primitif \
  --income-year=2023 \
  --dgfip_options=-g,-O,-k4,-m2023,-X \
  --backend dgfip_c \
  --output ../output/irpp_2023.c \
  $(find ../calculette-ir-master/sources2023m_8_0 -name 'tgvI.m') \
  $(find ../calculette-ir-master/sources2023m_8_0 -name 'errI.m') \
  $(find ../calculette-ir-master/sources2023m_8_0 -name '*.m' \
    ! -name 'err*.m' ! -name 'tgv*.m' ! -name 'cibles.m' | sort) \
  m_ext/2023/cibles.m m_ext/2023/codes_1731.m m_ext/2023/commence_par_5.m \
  m_ext/2023/commence_par_7.m m_ext/2023/commence_par_H.m \
  m_ext/2023/correctif.m m_ext/2023/main.m

cp ~/impots/irpp-mcp/output/irpp_driver.c ~/impots/output/
cp ~/impots/irpp-mcp/output/Makefile ~/impots/output/

cd ~/impots/output
make CDRIVER=../mlang-src/examples/dgfip_c/ml_primitif/c_driver

printf "V_0AC=1\nTSHALLOV=50000.00\n" | ./irpp_calc
# → {"IINET": 6786.00, "NBPT": 1.00, "RNI": 45000.00, ...}

pip install mcp pydantic

BINARY_PATH = Path(__file__).parent.parent / "output" / "irpp_calc"
# → ~/impots/output/irpp_calc  ✓ si vous avez suivi l'arborescence ci-dessus

{
  "mcpServers": {
    "irpp-mcp": {
      "command": "python3",
      "args": ["/home/user/impots/irpp-mcp/irpp_mcp.py"]
    }
  }
}

{
  "mcpServers": {
    "irpp-mcp": {
      "command": "wsl",
      "args": ["-e", "python3", "/mnt/c/Users/vous/impots/irpp-mcp/irpp_mcp.py"]
    }
  }
}