# cao_re2020

WHEN a house design needs an early THERMAL sanity check before the regulatory RE 2020 study (French energy and carbon rules for new buildings). Computes from the CAO scene: envelope areas and U-values, H_T in W/K with 10 % thermal bridges, mean U, compactness, which walls, roof or floor lose most, ventilation losses at the dwelling's base airflow, glazing per orientation, heat loss at design temperature, and design levers. It NEVER outputs a Bbio, Cep, DH or Ic figure: those need the official Th-BCE engine and a life-cycle assessment by a thermal consultant; the RE 2020 thresholds for houses are recalled with their sources.

Agent View of the PolicyLayer registry record for `cao_re2020`. HTML page: https://policylayer.com/tools/fr-synergieloc-immobilier/cao-re2020

## Facts

- Tool: `cao_re2020`
- Server: Immobilier (`https://synergieloc.fr/mcp`) — https://policylayer.com/tools/fr-synergieloc-immobilier.md
- Homepage: https://github.com/https://synergieloc.fr/mcp
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 12
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `murs` | array | no | Walls: plan segments extruded vertically. Every coordinate in this whole scene is in MILLIMETRES, in a single plan frame whose origin you choose — X to the righ |
| `plan` | array | no | 2D reference lines — drawn flat, never extruded and never counted in the quantities. Use them for axes, plot limits or setting-out marks. |
| `boites` | array | no | Boxes (furniture, volumes): a rectangular block placed by its CENTRE, not by a corner. Millimetres, same frame as murs[]. |
| `georef` | object | no | Optional Lambert-93 (EPSG:2154) false origin for IfcMapConversion. Local millimetres are scaled by 0.001 to CRS metres. Do not invent coordinates: omit est/nord |
| `cercles` | array | no | Circles on the 2D plan, alongside plan[] lines: each has a centre and a radius, in the same unit as the plan. Use for round shapes a polyline would render badly |
| `reseaux` | array | no | Plumbing pipe runs (EF/EC/EU/EV/EP/chauffage) — used only by cao_pdf (technical plan + linear-meter quantities per type). |
| `nord_deg` | number | no | Direction of north in the scene, in degrees clockwise from +y (0 means +y is north). Drives the split of glazing by orientation. |
| `toitures` | array | no | Roofs — used only by cao_pdf. WITHOUT this field: a flat roof is auto-generated over the footprint of ALL walls (legacy default). WITH it: compose freely — each |
| `plomberie` | array | no | Sanitary fixtures (sink, WC, shower…) — used only by cao_pdf. Same positioning as electricite. |
| `decoration` | array | no | Paint/finish per wall — used only by cao_pdf. Colors the elevations (exterior face) and the axonometric view (face auto-detected by orientation relative to the |
| `ouvertures` | array | no | Doors/windows embedded in a wall — used only by cao_pdf (elevations + axonometric view), no effect on dxf/metres. |
| `electricite` | array | no | Electrical symbols (outlets, switches, lights…) — used only by cao_pdf (dedicated technical plan + quantities), no effect on dxf/metres/render. Position: attach |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "cao_re2020",
    "arguments": {}
  }
}
```

## Why cao_re2020 is rated Medium

An AI agent can call cao_re2020 faster than any human can review: one bad instruction and it creates or modifies resources in Immobilier by the hundred, each call as confident as the last.

Risk signals: High parameter count (95 properties)

## Use case

AI agents use cao_re2020 to create or update resources in Immobilier, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Immobilier environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Immobilier:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "cao_re2020": {
      "limits": [
        {
          "counter": "cao_re2020_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Immobilier (69)

- `cao_energie` — Destructive — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-energie.md
- `cao_nomenclatures` — Destructive — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-nomenclatures.md
- `cao_verifier` — Destructive — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-verifier.md
- `cao_bibliotheque_familles` — Execute — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-bibliotheque-familles.md
- `cao_carnet` — Execute — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-carnet.md
- `cao_generer_ifc` — Execute — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-generer-ifc.md
- `cao_livrer` — Execute — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-livrer.md
- `cao_visite_camera` — Execute — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-visite-camera.md
- `bonnes_pratiques` — Read — https://policylayer.com/tools/fr-synergieloc-immobilier/bonnes-pratiques.md
- `cao_4d` — Read — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-4d.md
- `cao_devis` — Read — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-devis.md
- `cao_familles` — Read — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-familles.md
- `cao_ids_verifier` — Read — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-ids-verifier.md
- `cao_pdf` — Read — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-pdf.md
- `cao_rendu` — Read — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-rendu.md
- `cao_urbanisme` — Read — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-urbanisme.md
- `pack_partenaire` — Read — https://policylayer.com/tools/fr-synergieloc-immobilier/pack-partenaire.md
- `annonce_location` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/annonce-location.md
- `avenant_revision_irl` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/avenant-revision-irl.md
- `avis_echeance` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/avis-echeance.md
- `bon_intervention` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/bon-intervention.md
- `candidature_locataire` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/candidature-locataire.md
- `cao_bcf_ifc` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-bcf-ifc.md
- `cao_comparer_versions` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-comparer-versions.md
- `cao_conflits_ifc` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-conflits-ifc.md
- `cao_copilote` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-copilote.md
- `cao_demo` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-demo.md
- `cao_documents` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-documents.md
- `cao_famille_essayer` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-famille-essayer.md
- `cao_familles_recharger` — Write — https://policylayer.com/tools/fr-synergieloc-immobilier/cao-familles-recharger.md
- …and 39 more: https://policylayer.com/tools/fr-synergieloc-immobilier.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=fr-synergieloc-immobilier · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/fr-synergieloc-immobilier