👁 Image
SharpAI 1.0.17

<div align="center"> <img src="https://github.com/jchristn/sharpai/blob/main/assets/logo.png" width="256" height="256"> </div>

SharpAI

Transform your .NET applications into AI powerhouses - embed models directly or deploy as an Ollama-compatible and OpenAI-compatible API server. No cloud dependencies, no limits, just local embeddings and inference.

<p align="center"> <img src="https://img.shields.io/badge/.NET-5C2D91?style=for-the-badge&logo=.net&logoColor=white" /> <img src="https://img.shields.io/badge/C%23-239120?style=for-the-badge&logo=c-sharp&logoColor=white" /> <img src="https://img.shields.io/badge/License-MIT-yellow.svg?style=for-the-badge" /> </p>

<p align="center"> <a href="https://www.nuget.org/packages/SharpAI/"> <img src="https://img.shields.io/nuget/v/SharpAI.svg?style=flat" alt="NuGet Version"> </a>   <a href="https://www.nuget.org/packages/SharpAI"> <img src="https://img.shields.io/nuget/dt/SharpAI.svg" alt="NuGet Downloads"> </a> </p>

<p align="center"> <strong>A .NET library for local AI model inference with Ollama-compatible and OpenAI-compatible REST APIs</strong> </p>

<p align="center"> Embeddings • Completions • Chat • Built on LlamaSharp • GGUF Models Only </p>

📁 Monorepo Structure

SharpAI is organized as a monorepo containing the core library, server, dashboard, and client SDKs:

SharpAI/
├── src/ # Core .NET library and server
│ ├── SharpAI/ # Core library (NuGet: SharpAI)
│ ├── SharpAI.Server/ # REST API server (Watson 7 + OpenAPI/Swagger)
│ └── Test.*/ # Test projects
├── dashboard/ # Vite + React + Ant Design web interface
├── sdk/
│ ├── csharp/ # C# SDK (NuGet: SharpAI.Sdk)
│ ├── python/ # Python SDK (coming soon)
│ └── js/ # TypeScript/JavaScript SDK (npm: @sharpai/sdk)
├── docker/ # Docker assets
└── README.md

Sub-Projects

🚀 Features

• Ollama and OpenAI Compatible REST API Server — Provides endpoints compatible with API from Ollama and OpenAI
• Built-in OpenAPI / Swagger documentation — Every REST route is documented with tags, summaries, request and response schemas; the server exposes /openapi.json and a live /swagger UI at startup
• Settings API — GET /api/settings returns the live in-memory configuration, PUT /api/settings replaces it and rewrites sharpai.json on disk (preserving CreatedUtc and SoftwareVersion)
• Model Management — Download and manage GGUF models from HuggingFace using Ollama APIs
• Automatic Capability Detection — Each pulled model's general.architecture and general.pooling_type GGUF metadata determines whether it supports embeddings, completions, or both, and drives the correct chat template selection
• Multiple Inference Types:
  • Text embeddings generation
  • Text completions
  • Chat completions
• Prompt Engineering Tools — Built-in helpers for formatting prompts for different model types
• GPU Acceleration — Automatic CUDA detection (Windows/Linux) and Metal acceleration (macOS Apple Silicon)
• Streaming Support — Real-time token streaming for completions with proper stop-sequence handling
• SQLite Model Registry — Tracks model metadata and file information
• Web Dashboard — Vite + React + Ant Design UI for pulling models, generating embeddings, running completions and chat, inspecting running models, and editing server configuration live

📋 Table of Contents

• Installation
• Core Components
• Model Management
• Generating Embeddings
• Text Completions
• Chat Completions
• Prompt Formatting
• API Server
• Requirements
• Version History
• License
• Acknowledgments

📦 Installation

Install SharpAI via NuGet:

dotnet add package SharpAI

Or via Package Manager Console:

Install-Package SharpAI

📖 Core Components

AIDriver

The main entry point that provides access to all functionality:

using SharpAI;
using SyslogLogging;

// Initialize the AI driver
var ai = new AIDriver(
 logging: new LoggingModule(), 
 databaseFilename: "./sharpai.db", 
 huggingFaceApiKey: "hf_xxxxxxxxxxxx", 
 modelDirectory: "./models/" 
);

// Download a model from HuggingFace (GGUF format only)
await ai.Models.Add(
 name: "QuantFactory/Qwen2.5-3B-GGUF",
 quantizationPriority: null,
 progressCallback: (url, bytesDownloaded, percentComplete) =>
 {
 Console.WriteLine($"Progress: {percentComplete:P0}");
 });

// Generate a completion
string response = await ai.Completion.GenerateCompletion(
 model: "QuantFactory/Qwen2.5-3B-GGUF",
 prompt: "Once upon a time",
 maxTokens: 512,
 temperature: 0.7f
);

The AIDriver provides access to APIs via:

• ai.Models - Model management operations
• ai.Embeddings - Embedding generation
• ai.Completion - Text completion generation
• ai.Chat - Chat completion generation

ModelDriver

Manages model downloads and lifecycle:

// List all downloaded models
List<ModelFile> models = ai.Models.All();

// Get a specific model
ModelFile model = ai.Models.GetByName("QuantFactory/Qwen2.5-3B-GGUF");

// Download a new model from HuggingFace (GGUF format only)
ModelFile downloaded = await ai.Models.Add(
 name: "leliuga/all-MiniLM-L6-v2-GGUF",
 quantizationPriority: null,
 progressCallback: null);

// Delete a model
ai.Models.Delete("QuantFactory/Qwen2.5-3B-GGUF");

// Get the filesystem path for a model
string modelPath = ai.Models.GetFilename("QuantFactory/Qwen2.5-3B-GGUF");

🗄️ Model Management

SharpAI automatically handles downloading GGUF files from HuggingFace. Only GGUF format models are supported.

• Queries available GGUF files for a model
• Selects appropriate quantization based on file naming conventions
• Downloads and stores models with metadata
• Tracks model information in local Sqlite model registry

Model metadata includes:

• Model name and GUID
• File size and hashes (MD5, SHA1, SHA256)
• Quantization type
• Source URL
• Creation timestamps

🔢 Generating Embeddings

Generate vector embeddings for text:

// Single text embedding
float[] embedding = await ai.Embeddings.Generate(
 model: "leliuga/all-MiniLM-L6-v2-GGUF",
 input: "This is a sample text"
);

// Multiple text embeddings
string[] texts = { "First text", "Second text", "Third text" };
float[][] embeddings = await ai.Embeddings.Generate(
 model: "leliuga/all-MiniLM-L6-v2-GGUF",
 inputs: texts
);

📝 Text Completions

Note: for best results, structure your prompt in a manner appropriate for the model you are using. See the prompt formatting section below.

Generate text continuations:

// Non-streaming completion
string completion = await ai.Completion.GenerateCompletion(
 model: "QuantFactory/Qwen2.5-3B-GGUF",
 prompt: "The meaning of life is",
 maxTokens: 512,
 temperature: 0.7f
);

// Streaming completion
await foreach (string token in ai.Completion.GenerateCompletionStreaming(
 model: "QuantFactory/Qwen2.5-3B-GGUF",
 prompt: "Write a poem about",
 maxTokens: 512,
 temperature: 0.8f))
{
 Console.Write(token);
}

💬 Chat Completions

Note: for best results, structure your prompt in a manner appropriate for the model you are using. See the prompt formatting section below.

Generate conversational responses:

// Non-streaming chat
string response = await ai.Chat.GenerateCompletion(
 model: "QuantFactory/Qwen2.5-3B-GGUF",
 prompt: chatFormattedPrompt, // Prompt should be formatted for chat
 maxTokens: 512,
 temperature: 0.7f
);

// Streaming chat
await foreach (string token in ai.Chat.GenerateCompletionStreaming(
 model: "QuantFactory/Qwen2.5-3B-GGUF",
 prompt: chatFormattedPrompt,
 maxTokens: 512,
 temperature: 0.7f))
{
 Console.Write(token);
}

🛠️ Prompt Formatting

SharpAI includes prompt builders to format conversations for different model types:

Chat Message Formatting

using SharpAI.Prompts;

var messages = new List<ChatMessage>
{
 new ChatMessage { Role = "system", Content = "You are a helpful assistant." },
 new ChatMessage { Role = "user", Content = "What is the capital of France?" },
 new ChatMessage { Role = "assistant", Content = "The capital of France is Paris." },
 new ChatMessage { Role = "user", Content = "What is its population?" }
};

// Format for different model types
string chatMLPrompt = PromptBuilder.Build(ChatFormat.ChatML, messages);
/* Output:
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
What is the capital of France?<|im_end|>
<|im_start|>assistant
The capital of France is Paris.<|im_end|>
<|im_start|>user
What is its population?<|im_end|>
<|im_start|>assistant
*/

string llama2Prompt = PromptBuilder.Build(ChatFormat.Llama2, messages);
/* Output:
<s>[INST] <<SYS>>
You are a helpful assistant.
<</SYS>>

What is the capital of France? [/INST] The capital of France is Paris. </s><s>[INST] What is its population? [/INST] 
*/

string simplePrompt = PromptBuilder.Build(ChatFormat.Simple, messages);
/* Output:
system: You are a helpful assistant.
user: What is the capital of France?
assistant: The capital of France is Paris.
user: What is its population?
assistant:
*/

Supported chat formats:

• Simple - Basic role: content format (generic models, base models)
• ChatML - OpenAI ChatML format (GPT models, models fine-tuned with ChatML) including Qwen 2, Qwen 3, and Qwen 3.5
• Llama2 - Llama 2 instruction format (Llama-2-Chat models)
• Llama3 - Llama 3 format (Llama-3-Instruct models)
• Alpaca - Alpaca instruction format (Alpaca, Vicuna, WizardLM, and many Llama-based fine-tunes)
• Mistral - Mistral instruction format (Mistral-Instruct, Mixtral-Instruct models)
• HumanAssistant - Human/Assistant format (Anthropic Claude-style training, some chat models)
• Zephyr - Zephyr model format (Zephyr beta/alpha models)
• Phi - Microsoft Phi format (Phi-2, Phi-3 models)
• DeepSeek - DeepSeek format (DeepSeek-Coder, DeepSeek-LLM models)
• Gemma - Google Gemma turn-token format (Gemma 2, Gemma 3, and Gemma 4 models)

If you are unsure which your model supports, choose Simple.

SharpAI maps common architecture aliases automatically, including qwen3.5, qwen-3.5, gemma4, and gemma-4.

These mappings align with the LLamaSharp 0.27.0 upgrade and help newer Qwen3.5 and Gemma4 GGUFs pick the correct prompt template automatically.

Text Generation Formatting

using SharpAI.Prompts;

// Simple instruction
string instructionPrompt = TextPromptBuilder.Build(
 TextGenerationFormat.Instruction,
 "Write a haiku about programming"
);
/* Output:
### Instruction:
Write a haiku about programming

### Response:
*/

// Code generation with context
var context = new Dictionary<string, string>
{
 ["language"] = "python",
 ["requirements"] = "Include error handling"
};

string codePrompt = TextPromptBuilder.Build(
 TextGenerationFormat.CodeGeneration,
 "Write a function to parse JSON",
 context
);
/* Output:
Language: python
Task: Write a function to parse JSON
Requirements: Include error handling

```python
*/

// Question-answer format
string qaPrompt = TextPromptBuilder.Build(
 TextGenerationFormat.QuestionAnswer,
 "What causes rain?"
);
/* Output:
Question: What causes rain?

Answer:
*/

// Few-shot examples
var examples = new List<(string input, string output)>
{
 ("2+2", "4"),
 ("5*3", "15")
};

string fewShotPrompt = TextPromptBuilder.BuildWithExamples(
 TextGenerationFormat.QuestionAnswer,
 "7-3",
 examples
);
/* Output:
Examples:

Question: 2+2

Answer:
4

---

Question: 5*3

Answer:
15

---

Now complete the following:

Question: 7-3

Answer:
*/

Supported text generation formats:

• Raw - No formatting
• Completion - Continuation format
• Instruction - Instruction/response format
• QuestionAnswer - Q&A format
• CreativeWriting - Story/creative format
• CodeGeneration - Code generation format
• Academic - Academic writing format
• ListGeneration - List creation format
• TemplateFilling - Template completion
• Dialogue - Dialogue generation

🌐 API Server

SharpAI includes a fully-functional REST API server through the SharpAI.Server project, built on Watson 7. It provides Ollama-compatible endpoints, OpenAI-compatible endpoints, a settings-management API, and built-in OpenAPI 3.0 / Swagger UI.

Ollama API endpoints include:

• GET /api/tags — List available local models (returns a capabilities object indicating embedding and completion support per model)
• POST /api/pull — Download models from HuggingFace (streams NDJSON progress with downloaded, completed, total, and percent)
• DELETE /api/delete — Delete a local model
• GET /api/ps — List models currently loaded in memory (analogous to ollama ps)
• POST /api/embed — Generate embeddings
• POST /api/generate — Text completions (streaming and non-streaming; honors options.stop)
• POST /api/chat — Chat completions (automatically wraps messages in the correct chat template for the model's GGUF architecture)

OpenAI API endpoints include:

• POST /v1/embeddings — Generate embeddings
• POST /v1/completions — Text completions (streaming via SSE)
• POST /v1/chat/completions — Chat completions (streaming via SSE)

Settings API:

• GET /api/settings — Return the full live in-memory Settings object
• PUT /api/settings — Replace the in-memory settings and rewrite sharpai.json to disk. CreatedUtc and SoftwareVersion are preserved server-side so clients cannot overwrite them. Some settings (REST Hostname/Port/Ssl, Database) take effect only on the next restart.

Operational endpoints:

• GET /health - Lightweight liveness check for process monitoring
• GET /ready - Readiness check for native backend initialization, database initialization, and writable runtime directories

API documentation:

• GET /openapi.json — Complete OpenAPI 3.0 document describing every route, tag, request body, and response schema
• GET /swagger — Interactive Swagger UI served from the same server

CORS preflight OPTIONS requests are handled by the server so dashboard cross-origin calls work out of the box.

⚙️ Requirements

System Requirements

Minimum:

• OS: Windows 10+, macOS 12+, or Linux (Ubuntu 20.04+, Debian 11+)
• .NET: 8.0 or higher
• RAM: Minimum 8GB of RAM recommended, have enough RAM for running models if using CPU
• Disk: 20GB+ of disk space recommended, have enough capacity for downloaded models
• Internet: Required for downloading models
• HuggingFace API Key: Required (free at https://huggingface.co/settings/tokens)

For GPU Acceleration (Optional):

NVIDIA CUDA (Windows/Linux):

• NVIDIA GPU with Compute Capability 6.0+ (Pascal or newer)
• 8GB+ VRAM (16GB+ for larger models)
• NVIDIA proprietary drivers installed
• CUDA Toolkit 12.x (for bare-metal deployments)
• NVIDIA Container Toolkit (for Docker deployments)

Apple Metal (macOS Apple Silicon):

• Apple M1, M2, M3, or M4 chip
• macOS 13 (Ventura) or later
• Bare-metal installation (not Docker — Docker containers run Linux and cannot access Metal)

Important GPU Notes:

• AMD and Intel GPUs are not supported
• Docker on Apple Silicon does not provide Metal acceleration — use bare-metal macOS for GPU

Tested Platforms

SharpAI has been tested on:

• Windows 11 (x64)
• macOS Sequoia (Apple Silicon - Metal GPU)
• Ubuntu 24.04 LTS (x64)

Full Deployment Guide

For detailed installation instructions, troubleshooting, and production deployment, see .

📊 Model Information

When models are downloaded, the following information is tracked:

• Model name and unique GUID
• File size
• MD5, SHA1, and SHA256 hashes
• Quantization type (e.g., Q4_K_M, Q5_K_S)
• Source URL from HuggingFace
• Download and creation timestamps

🔧 Configuration

Directory Structure

Models are stored in the specified modelDirectory with files named by their GUID. Model metadata is stored in the SQLite database specified by databaseFilename.

GPU Support

SharpAI automatically detects GPU availability and optimizes layer allocation at startup.

Supported:

• NVIDIA GPUs via CUDA (Windows and Linux)
• Apple Silicon via Metal (macOS ARM64, bare-metal only)

Not Supported:

• AMD GPUs (ROCm/Vulkan not supported)
• Intel GPUs (SYCL/Vulkan not supported)

The NativeLibraryBootstrapper automatically detects your platform and GPU at startup, selecting the appropriate backend (CPU, CUDA, or Metal). See the Requirements section for detailed GPU requirements.

🐳 Running in Docker

SharpAI.Server is available as a Docker image, providing an easy way to deploy the Ollama-compatible API server without local installation.

Quick Start

Using Docker Run

For Windows:

run.bat v4.0.1

For Linux/macOS:

./run.sh v4.0.1

Using Docker Compose

For Windows:

compose-up.bat

For Linux/macOS:

./compose-up.sh

Prerequisites

Before running the Docker container, decide what you want to persist:

1. Configuration file: The image includes a Docker-safe /app/sharpai.json default. Mount your own sharpai.json when you want persistent/custom settings.
2. Directory structure: The image creates /app/logs, /app/models, and /app/temp. Bind mount ./logs/ and ./models/ when you want logs and downloaded GGUF models to survive container replacement.

Docker Image

The official Docker image is available at: jchristn77/sharpai. Refer to the docker directory for assets useful for running in Docker and Docker Compose.

Docker Runtime Controls

The Docker image contains CPU and CUDA-capable Linux native libraries and selects the backend at container startup/runtime. These environment variables are available in the image and are included with placeholder defaults in the compose files under docker/.

For NVIDIA Docker deployments, the CUDA compose file also sets NVIDIA_VISIBLE_DEVICES=all and NVIDIA_DRIVER_CAPABILITIES=compute,utility.

Volume Mappings

The container uses several volume mappings for persistence:

Configuration

Modify the sharpai.json file to supply your configuration.

Networking

The container exposes port 8000 by default.

You can access Ollama APIs at:

• http://localhost:8000/api/tags - List available models
• http://localhost:8000/api/pull - Pull a model
• http://localhost:8000/api/generate - Generate text
• http://localhost:8000/api/chat - Chat completions
• http://localhost:8000/api/embed - Generate embeddings

You can access OpenAI APIs at:

• http://localhost:8000/v1/embeddings - Generate embeddings
• http://localhost:8000/v1/completions - Generate text
• http://localhost:8000/v1/chat/completions - Chat completions

Operational endpoints:

• http://localhost:8000/health - Liveness check
• http://localhost:8000/ready - Readiness check

Example Usage

1. Create persistent directories when you want host-side logs and models:

   mkdir logs models
   

2. Create or mount sharpai.json when you need custom settings. The image includes a default for quick smoke tests.

3. Run the container:

   # Windows
   run.bat v4.0.1
   
   # Linux/macOS
   ./run.sh v4.0.1
   

4. Download a model using the API (GGUF format required):

   curl http://localhost:8000/api/pull \
    -d '{"model":"QuantFactory/Qwen2.5-3B-GGUF"}'
   

5. Generate text:

   curl http://localhost:8000/api/generate \
    -d '{
    "model": "QuantFactory/Qwen2.5-3B-GGUF",
    "prompt": "Why is the sky blue?",
    "stream": false
    }'
   

Docker Compose

For production deployments, you can use Docker Compose. Create a compose.yaml file:

services:
 sharpai:
 image: jchristn77/sharpai:v4.0.1
 ports:
 - "8000:8000"
 volumes:
 - ./sharpai.json:/app/sharpai.json
 - ./sharpai.db:/app/sharpai.db
 - ./logs:/app/logs
 - ./models:/app/models
 environment:
 DOTNET_GC_SERVER: "1"
 SHARPAI_FORCE_BACKEND: "auto"
 SHARPAI_CPU_VARIANT: "auto"
 SHARPAI_REQUIRE_BACKEND: "false"
 SHARPAI_ENABLE_NATIVE_LOGGING: "false"
 SHARPAI_NUM_THREADS: "0"
 SHARPAI_BATCH_THREADS: "0"
 SHARPAI_GPU_LAYERS: "auto"
 SHARPAI_MAIN_GPU: "0"
 SHARPAI_CONTEXT_SIZE: "0"
 SHARPAI_BATCH_SIZE: "0"
 SHARPAI_UBATCH_SIZE: "0"
 SHARPAI_USE_MMAP: "true"
 SHARPAI_USE_MLOCK: "false"
 SHARPAI_FLASH_ATTENTION: "false"
 healthcheck:
 test: ["CMD-SHELL", "curl --fail http://localhost:8000/ready || exit 1"]
 interval: 30s
 timeout: 10s
 retries: 5
 start_period: 30s
 restart: unless-stopped

Then run:

docker compose up -d

GPU Support in Docker

To enable GPU acceleration in Docker:

NVIDIA GPUs

Install the NVIDIA Container Toolkit and modify your run command:

docker run --gpus all \
 -p 8000:8000 \
 -v ./sharpai.json:/app/sharpai.json \
 -v ./sharpai.db:/app/sharpai.db \
 -v ./logs:/app/logs \
 -v ./models:/app/models \
 jchristn77/sharpai:v4.0.1

For Docker Compose, add:

services:
 sharpai:
 # ... other configuration ...
 environment:
 SHARPAI_FORCE_BACKEND: "cuda"
 SHARPAI_REQUIRE_BACKEND: "true"
 NVIDIA_VISIBLE_DEVICES: "all"
 NVIDIA_DRIVER_CAPABILITIES: "compute,utility"
 deploy:
 resources:
 reservations:
 devices:
 - driver: nvidia
 count: all
 capabilities: [gpu]

Troubleshooting

• Container exits immediately: Check that sharpai.json exists and is valid JSON
• Models not persisting: Ensure the ./models/ directory has proper write permissions
• Cannot connect to API: Verify port 8000 is not already in use and firewall rules allow access
• Out of memory errors: Large models may require significant RAM. Consider using quantized models or adjusting Docker memory limits

📚 Version History

Please see the file for detailed version history and release notes.

Have a bug, feature request, or idea? Please file an issue on our GitHub repository. We welcome community input on our roadmap!

📄 License

This project is licensed under the MIT License.

🙏 Acknowledgments

• Built on LlamaSharp for GGUF model inference
• Model hosting by HuggingFace
• Inspired by (and forever grateful to) Ollama for API compatibility
• Special thanks to the community of developers that helped build, test, and refine SharpAI