Cassis: An Agentic AI Toolkit for Rhino Grasshopper

Version 2.0

Slezak, Samuel; Siriwardena, Lasath, 2026, "Cassis: An Agentic AI Toolkit for Rhino Grasshopper", https://doi.org/10.18419/DARUS-5777, DaRUS, V2

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Description	Cassis consists of the plugin library Cassis and a transport library for Streamable HTTP-based MCP communication for Rhino Grasshopper. Cassis implements the functionality specific to connecting agentic AI systems to Rhino Grasshopper through the Model Context Protocol. The plugin can, in principle, be referenced from any AI coding assistant that supports MCP, including IDE Copilots / Agents, Terminal CLI agents, and proprietary systems. Cassis defines three service interfaces for component manipulation, document management, and UI thread coordination, and the MCP host class. In addition to the service layer, the plugin provides tool categories: script tools for C# and Python components, component tools for adding and configuring Grasshopper objects, connection tools for wiring parameters, panel tools, group tools, canvas and viewport capture tools, document tools, solver control tools, component analytics tools, diagnostics tools, and ABxM interoperability tools for agent-based modelling. The necessary tool, service, and transport classes are derived from the corresponding interfaces and discovered at startup. A Grasshopper component exposes the server on the canvas and lets users select which tools the AI assistant can call. Instructions for the use of the source code are included in the file "README.md". (2026-03-06)
Subject	Computer and Information Science; Engineering
Keyword	Computational Design, Human-Computer Interaction
License/Data Use Agreement	MIT License

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	cassis.zip ZIP Archive - 2.3 MB Published Mar 19, 2026 2 Downloads MD5: 1e2857b7392d35e4ccbf8aa222433d0e	Preview "cassis.zip" Access File File Access Public Download Options ZIP Archive Download Metadata Data File Citation Download EndNote XML Download RIS Download BibTeX

Citation Metadata

Persistent Identifier	doi:10.18419/DARUS-5777
Publication Date	2026-03-12
Title	Cassis: An Agentic AI Toolkit for Rhino Grasshopper
Author	https://ror.org/04vnq7t77https://orcid.org/0009-0003-0303-7730 https://ror.org/04vnq7t77https://orcid.org/0000-0001-9100-1321
Point of Contact	Use email button above to contact. Slezak, Samuel (University of Stuttgart)
Description	Cassis consists of the plugin library Cassis and a transport library for Streamable HTTP-based MCP communication for Rhino Grasshopper. Cassis implements the functionality specific to connecting agentic AI systems to Rhino Grasshopper through the Model Context Protocol. The plugin can, in principle, be referenced from any AI coding assistant that supports MCP, including IDE Copilots / Agents, Terminal CLI agents, and proprietary systems. Cassis defines three service interfaces for component manipulation, document management, and UI thread coordination, and the MCP host class. In addition to the service layer, the plugin provides tool categories: script tools for C# and Python components, component tools for adding and configuring Grasshopper objects, connection tools for wiring parameters, panel tools, group tools, canvas and viewport capture tools, document tools, solver control tools, component analytics tools, diagnostics tools, and ABxM interoperability tools for agent-based modelling. The necessary tool, service, and transport classes are derived from the corresponding interfaces and discovered at startup. A Grasshopper component exposes the server on the canvas and lets users select which tools the AI assistant can call. Instructions for the use of the source code are included in the file "README.md". (2026-03-06)
Subject	Computer and Information Science; Engineering
Keyword	Computational Design http://www.wikidata.org/entity/Q106195621 (Wikidata) Human-Computer Interaction https://id.loc.gov/authorities/subjects/sh88003229.html (LCSH) https://id.loc.gov/authorities/subjects.html
Topic Classification	Artificial Intelligence and Machine Learning Methods (DFGFO) https://w3id.org/dfgfo/2024/443-04
Funding Information	DFG: EXC 2120/1 - 390831618
Depositor	Slezak, Samuel
Deposit Date	2026-03-06
Data Type	Source code
Software	Cursor, Version: 2.6.12 .NET 8 SDK, Version: 8.0.418

Software Metadata (CodeMeta v2.0)

Software Version	1.0.0
Development Status	Active
Application Category	Developer Tools / AI Integration
Application Subcategory	Grasshopper Plugin (MCP Server)
Programming Language	C#
Runtime Platform	.NET 8.0 (Windows & macOS)
Operating Systems	Windows, macOS
Target Product	Grasshopper (Rhino 8)
Software Requirements	.NET 8 SDK, https://dotnet.microsoft.com/download/dotnet/8.0 Rhino 8 (v8.0+), Grasshopper v8.0.23304.9001 https://www.rhino3d.com/
Memory Requirements	4 GB RAM minimum (Rhino 8 system requirement)
Processor Requirements	Modern multi-core CPU (Rhino 8 system requirement)
Storage Requirements	~50–100 MB (plugin + dependency DLLs)
Permissions	TCP port 3003 (localhost), write access to %APPDATA%\Grasshopper\Libraries\Cassis\

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Curation Status History

Status	Date	Assigner
	2026-03-19 13:45:29	Tobias Schwinn
In Review by FoKUS	2026-03-18 10:01:57	Dorothea Iglezakis

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