sglang

Serve LLMs with RadixAttention prefix caching and constrained decoding.

3|Updated Feb 21, 2026
One-click install
npx skills add https://github.com/ihatesea69/HieuNghi-AI-Skills --skill sglang-ihatesea69
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: sglang
Source: https://github.com/ihatesea69/HieuNghi-AI-Skills/tree/main/airesearch_skills/12-inference-serving/sglang
Command: npx skills add https://github.com/ihatesea69/HieuNghi-AI-Skills --skill sglang-ihatesea69

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires sglang, torch, transformers, and includes references (resource) components.

What problem does it solve?

This Skill addresses the significant latency and throughput bottlenecks in serving Large Language Models (LLMs), especially for agentic workflows and structured generation tasks, by dramatically speeding up inference.

Core Features & Use Cases

  • Fast Structured Generation: Enables 5x faster inference for LLMs, particularly for tasks requiring JSON, regex, or grammar-constrained outputs, and agentic workflows with tool calls.
  • Automatic Prefix Caching: RadixAttention technology automatically reuses KV cache for common prefixes, leading to substantial speedups in multi-turn conversations, few-shot prompting, and agentic loops without manual configuration.
  • Use Case: Building an AI agent that repeatedly uses the same system prompt and tool definitions to answer user queries. SGLang will cache these common parts, making each subsequent query much faster.

Quick Start

Use the sglang skill to launch a server for the Llama 3-8B model on port 30000 with automatic prefix caching enabled.

Frequently Asked Questions about sglang

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I speed up LLM inference for multi-turn conversations and agentic workflows?

Speed up LLM inference by using RadixAttention for automatic prefix caching, which reuses KV cache for common prefixes in multi-turn conversations and agentic loops without manual configuration. This yields up to 5x faster inference compared to standard serving frameworks.

Does SGLang support structured generation with JSON and regex constraints?

Yes, SGLang supports structured generation with JSON, regex, and grammar-based constrained decoding. This enables 5x faster inference for tasks requiring specific output formats and agentic workflows with tool calls.

How does RadixAttention improve prefix caching for few-shot prompting?

RadixAttention improves prefix caching by automatically reusing the KV cache for common prefixes encountered in few-shot prompting and multi-turn conversations. This automatic reuse leads to substantial speedups without requiring manual cache configuration.

What is the best way to serve an LLM with automatic prefix caching?

The best way to serve an LLM with automatic prefix caching is using SGLang to launch a server, such as for the Llama 3-8B model on port 30000. RadixAttention handles the caching automatically to accelerate inference.

Do I need PyTorch and Transformers to use SGLang for LLM serving?

Yes, you need PyTorch and Transformers installed as dependencies to use SGLang. These frameworks provide the foundational model loading and tensor operations required for high-performance LLM serving with RadixAttention.

Why is my LLM serving slower than expected for repeated system prompts?

Standard serving frameworks lack automatic prefix caching, causing recomputation for repeated system prompts. Using SGLang with RadixAttention caches these common parts, making each subsequent agentic query much faster.