Zexus

An in-process Revit AI agent that compiles and runs C# at runtime to drive any Revit API operation through natural language.

Zexus is a Revit add-in that runs entirely inside the Revit process. Describe what you want in plain English; the agent writes Revit API code on the fly, compiles it via Roslyn, and executes it against your active document — no script files to manage, no external service to deploy, no per-task tool to author. Read-only inspection runs without ceremony; write operations land behind explicit user confirmation.

Features

• Roslyn dynamic compilation, in-process — every action the agent takes is real C# code compiled at runtime against the live Revit API. No predefined tool catalogue to maintain; the agent reaches whatever API surface it needs.
• Multi-provider LLM — choose Anthropic (Claude), OpenAI (GPT), or Google (Gemini). Bring your own API key; configure on first launch.
• Guardrails for write operations — the agent must present a plan and obtain explicit user confirmation before any model-modifying transaction.
• Native Revit plugin — installs as a per-user MSI, registers as a Revit add-in, ships in a Ribbon tab. Supports Revit 2022–2026 (.NET Framework 4.8 + .NET 8).

Quick Start

1. Download Zexus_Setup_v*.msi from the latest release.
2. Run the installer. It is per-user and does not require admin privileges.
3. Launch Revit. Open the Zexus Ribbon tab and click the agent button.
4. On first launch, open Settings, choose a provider (Anthropic / OpenAI / Google), and paste your API key.

For prerequisites and detailed instructions, see .