Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
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Players can hold natural-language conversations with NPCs that have a persona, backed by the Anthropic Messages API (default model claude-haiku-4-5, disabled by default). - Personas come from hand-authored templates in Data/ai-personas.json (matched by exact NPC name or class name walking the inheritance chain) or from per-NPC personas set in game with [SetPersona and persisted through world saves via a GenericPersistence module. - A greeting near a persona NPC, or speaking its name, starts a conversation; farewells, walking away, or two minutes of silence end it. Speech is observed passively through EventSink.Speech, so bank, guard, vendor and pet keywords are unaffected. - Requests are dispatched with async/await: HTTP I/O runs off-thread and continuations marshal back to the game loop through the EventLoopContext, so the game thread never blocks on the network. Replies are dropped if the session ended, the NPC was deleted, or the player disconnected while the request was in flight. - Cost controls: per-player cooldown and per-minute caps, a server-wide concurrent request cap, bounded history and input/output lengths - all configurable under aiConversation.* settings. - Replies are sanitized and split into ~120-char chunks spoken at ~900ms intervals; failures retry once on 429/5xx/timeout, then fall back to a canned in-character line. - Staff commands: [SetPersona, [RemovePersona, [PersonaInfo (GM) and [AIChat status|on|off|reload|end (Admin) with token usage stats. - The API key is only read from an environment variable (ANTHROPIC_API_KEY by default); ships with persona examples, a feature README and unit tests for the pure logic. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GPKWo5V4JXt22nQtFnat41 |
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| branding | ||
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| Distribution/Data | ||
| Projects | ||
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| AGENTS.md | ||
| azure-pipelines.yml | ||
| CLAUDE.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Directory.Build.props | ||
| FAQ.md | ||
| GEMINI.md | ||
| global.json | ||
| LICENSE | ||
| ModernUO.slnx | ||
| publish.cmd | ||
| publish.ps1 | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| SPONSORS.md | ||
| stylecop.json | ||
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ModernUO 
Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Required Frameworks
All Operating Systems
Windows
Development
Supported IDEs
Getting Started
- Install prerequisite requirements
- Clone this repository (or download the latest):
git clone https://github.com/modernuo/ModernUO.git
- Open
ModernUO.slnto start developing
Building/Publishing
Interactive Mode (Recommended for new users)
Run ./publish.cmd (Windows) or ./publish.sh (Linux/macOS) with no arguments to launch the guided build tool. It will:
- Check prerequisites (.NET SDK, native libraries)
- Walk you through configuration and platform selection
- Build and publish the server to the
Distributiondirectory - Show deployment instructions for cross-compiled builds
Command Line
./publish.cmd [release|debug] [os] [arch]
os- Supported operating systemsarchx64- Intel/AMD 64-bitarm64- ARM 64-bit
Linux Prerequisites
Fedora, CentOS, RHEL, etc
dnf upgrade --refresh -y
# CentOS does not come with EPEL enabled
dnf install -y epel-release epel-next-release
dnf install -y findutils libicu libdeflate-devel zstd libargon2-devel liburing-devel
Ubuntu, Debian, etc
apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev liburing-dev
OSX Requirements
brew install icu4c libdeflate zstd argon2
Running the Server
- Follow the publish instructions
- The
Distributiondirectory is portable — copy it to your production server for deployment - Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory - On first run, the server will prompt you to configure game data file locations
Troubleshooting / FAQ
- See FAQ
Want to sponsor?
Thank you for supporting us! You can find out how by visiting the sponsors page.
Collaborators
Thanks
- RunUO Team & Community
- Voxpire, the ServUO Team & Community
- Karasho, Jaedan and the ClassicUO Community
Development Tools & Plugins provided with ♥ by
Code Signing Policy
Free code signing provided by SignPath.io, certificate by SignPath Foundation.
This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it
Teams & Roles
Approvers & Committers: Development Team