TopologicPy Server

A Model Context Protocol server that exposes TopologicPy TopologicPy-docs's spatial modeling capabilities to LLM agents like Claude Code, Claude Desktop, and other MCP clients. This was created to assist us in developing further tools around Topologic and TopologicPy

What This Enables

Ask Claude (or any MCP-equipped LLM) to build architectural models through natural language:

"Create a 3-storey office building, 12m × 20m with 3.5m floor heights, then show me the adjacency graph and export to IFC"

The MCP server translates these requests into precise TopologicPy operations, maintaining a named object session across the conversation.

Architecture

┌─────────────────────────────────────────────────┐
│              MCP Client (Claude Code, etc.)       │
│  Natural language ↔ tool calls                   │
└────────────────────┬────────────────────────────┘
                     │  MCP Protocol (stdio/SSE)
                     ▼
┌─────────────────────────────────────────────────┐
│            TopologicPy MCP Server                │
│  ┌───────────────────────────────────────────┐  │
│  │  Session Store (named topology objects)    │  │
│  │  • "building" → CellComplex               │  │
│  │  • "floor_0"  → Cell                      │  │
│  │  • "graph"    → Graph                     │  │
│  └───────────────────────────────────────────┘  │
│                                                  │
│  Tools: create, boolean, transform, query, I/O   │
│  Resources: session state, BREP strings          │
│  Prompts: building envelope, adjacency, grids    │
└────────────────────┬────────────────────────────┘
                     │
                     ▼
┌─────────────────────────────────────────────────┐
│                  TopologicPy                     │
│  Vertex → Edge → Wire → Face → Shell → Cell     │
│  CellComplex → Cluster → Graph → Dictionary     │
│  OpenCASCADE (BREP) • IfcOpenShell (IFC)        │
└─────────────────────────────────────────────────┘

Available Tools (36 tools)

Creation

Tool	Description
create_vertex	Create a point at (x, y, z)
create_edge	Line segment between two vertices
create_wire	Polyline from ordered vertices
create_face_by_wire	Face from a closed wire
create_face_rectangle	Rectangular face
create_face_circle	Circular face (polygon approximation)
create_cell_by_faces	3D solid from bounding faces
create_cell_prism	Box / rectangular prism
create_cell_cylinder	Cylindrical cell
create_cellcomplex_by_cells	Merged cell assembly (shared boundaries)
create_cluster	Unstructured collection

Boolean Operations

Tool	Description
boolean_union	A ∪ B
boolean_difference	A − B
boolean_intersect	A ∩ B
self_merge	Resolve self-intersections

Transformations

Tool	Description
translate	Move by vector
rotate	Rotate around axis
scale	Scale relative to origin

Query & Analysis

Tool	Description
list_topologies	List all named objects in session
query_topology	Detailed info (counts, centroid, volume, area)
get_vertices	Extract vertex coordinates
get_sub_topologies	Extract and optionally store sub-elements

Graph Operations

Tool	Description
create_graph_from_topology	Dual/adjacency graph
graph_shortest_path	Shortest path between vertices

Dictionary (Metadata)

Tool	Description
set_dictionary	Attach key-value metadata
get_dictionary	Read attached metadata

Import / Export

Tool	Description
export_brep	Export to BREP string/file
import_brep	Import from BREP string/file
export_obj	Export triangulated mesh (OBJ)
export_ifc	Export to IFC (BIM)
import_ifc	Import from IFC file

Session Management

Tool	Description
remove_topology	Delete from session
rename_topology	Rename an object
copy_topology	Deep copy with new name

Installation

With uv (recommended)

cd topologic-mcp-server
uv venv
source .venv/bin/activate
uv pip install -e .

With pip

cd topologic-mcp-server
pip install -e .

Usage

With Claude Code

Add to your Claude Code MCP configuration (~/.claude/claude_code_config.json):

{
  "mcpServers": {
    "topologic": {
      "command": "python",
      "args": ["-m", "topologic_mcp"],
      "cwd": "/path/to/topologic-mcp-server"
    }
  }
}

Or using uv directly:

{
  "mcpServers": {
    "topologic": {
      "command": "uv",
      "args": ["run", "--directory", "/path/to/topologic-mcp-server", "topologic-mcp"]
    }
  }
}

With Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "topologic": {
      "command": "uv",
      "args": ["run", "--directory", "/path/to/topologic-mcp-server", "topologic-mcp"]
    }
  }
}

Standalone (stdio transport)

python -m topologic_mcp

With MCP Inspector (for testing)

mcp dev src/topologic_mcp/server.py

Example Conversations

Create a simple building

User: Create a 3-storey building, 10m × 15m, 3m floor height

Claude: [calls create_vertex, create_cell_prism × 3, translate × 2,
         create_cellcomplex_by_cells, query_topology]

Result: CellComplex "building" with 3 cells, 16 faces, 33 edges, 20 vertices

Analyze spatial adjacency

User: Show me which floors share faces in the building

Claude: [calls create_graph_from_topology with via_shared_faces=True,
         get_sub_topologies to list cells, query each cell]

Result: Graph with 3 vertices (one per floor) and 2 edges
        (floor_0↔floor_1, floor_1↔floor_2)

Boolean operations

User: Cut a 2m diameter hole through the middle of floor_1

Claude: [calls create_cell_cylinder for the hole, translate to position,
         boolean_difference to subtract from floor_1]

Result: Updated floor_1 with cylindrical void

License

GPL-3.0-or-later (matching TopologicPy's license)

Contributing

This server wraps TopologicPy's pure-Python API. To add new tools:

1. Add a @mcp.tool() decorated function in server.py
2. Follow the naming convention: verb_noun (e.g., create_vertex, export_brep)
3. Always accept ctx: Context as the first parameter
4. Use the TopologyStore from ctx.request_context.lifespan_context
5. Return descriptive strings (the LLM reads these)