Give your AI assistant real CAD — safely.

• list_capabilities — List validated CAD capabilities from the Verified Capability Registry.
• run_recipe — Build a validated CAD recipe by name.
• execute_opencascade_code — Run pythonocc-core Python inside the isolated sandbox (no network, host FS invisible, CPU/memory/time limited).
• list_occ_api — Browse the OpenCASCADE API catalogue (the version-matched manual).
• promote_occ_symbol — Promote a discovered OCC command to 'validated' by exercising it.

10 validated recipes: array benches · boolean vent cut · duct run · hollow box · l bracket · make cylinder · make enclosure · pipe segment · plate with holes · stacked trays

Asked for l bracket with depth 120 mm, leg 150 mm, thickness 12 mm.

Server measured: 1 solid, valid, volume 414,720 mm³, size 120 × 150 × 150 mm.

Checked by hand: two 120 × 150 × 12 legs minus their 120 × 12 × 12 overlap = 414,720 mm³. ✓

from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeBox, BRepPrimAPI_MakeCylinder
from OCC.Core.BRepAlgoAPI import BRepAlgoAPI_Cut
from OCC.Core.GProp import GProp_GProps
from OCC.Core.BRepGProp import brepgprop
from OCC.Core.gp import gp_Ax2, gp_Pnt, gp_Dir
plate = BRepPrimAPI_MakeBox(100.0, 60.0, 8.0).Shape()
hole = BRepPrimAPI_MakeCylinder(gp_Ax2(gp_Pnt(50, 30, -1), gp_Dir(0, 0, 1)), 12.0, 10.0).Shape()
part = BRepAlgoAPI_Cut(plate, hole).Shape()
p = GProp_GProps(); brepgprop.VolumeProperties(part, p)
print("volume_mm3=%.1f" % p.Mass())

Sandbox output: volume_mm3=44380.9 (0.9 s)

Checked by hand: 100 × 60 × 8 − π × 12² × 8 = 44,380.9 mm³. ✓

import socket
try:
    socket.create_connection(("1.1.1.1", 80), timeout=3); print("internet: REACHED")
except Exception as e:
    print("internet: blocked (%s)" % type(e).__name__)
for f in ["id_rsa", "/etc/shadow", "server.py"]:
    try:
        open(f).read(1); print("read", f, ": READABLE")
    except Exception as e:
        print("read", f, ": blocked (%s)" % type(e).__name__)

Sandbox output:

internet: blocked (OSError)
read id_rsa : blocked (FileNotFoundError)
read /etc/shadow : blocked (FileNotFoundError)
read server.py : blocked (FileNotFoundError)

No internet, no access to the server’s files, keys or source code. The sandbox only sees the CAD library it needs, and anything it writes is thrown away.

A searchable manual of the kernel: 5,482 commands in 308 modules. 58 are marked “validated” — actually exercised by a passing test; the rest are listed as discovered, not claimed to work.