Features

## Open by design

Every layer is swappable at runtime. No lock-in.

01

### 🔌 Multi-LLM providers

Bring any LLM — from Anthropic to Z.ai. Switch with `/model`.

02

### 🔍 Pluggable search

Exa, Tavily, Brave, or Serper. Switch with `/search`.

03

### 🧩 Skills & extensions

Skills, plugins, MCP servers, and subagents — Claude Code compatible, run unmodified.

04

### 🎭 Personas

Markdown-defined agent identities, scoped per user or project, plus lifecycle hooks.

05

### ⚡ Native performance

A single Go binary. 12 MB, ~0.01s startup, no runtime.

06

### 💾 Session persistence

Sessions auto-save, resume, and fork, with automatic context compaction.

07

### ✦ Self-evolving Level 1 · live

Every few turns, a background reviewer distills your recent work into durable memory and reusable skills — so the agent levels up as you work, no manual tuning. Level 1 is live today; deeper levels are on the way.

Lv.1 Curious → Lv.10 Better → Lv.50 Stronger → Lv.∞ Legendary
Deploy anywhere

## One binary. Runs anywhere.

A single ~12 MB binary, zero runtime dependencies — the same file runs unchanged on a laptop, a cloud node, or a 256 MB edge device.

💻 macOS & Linux laptops ☁️ Cloud nodes & VMs 📟 ARM edge devices 🐳 `scratch` containers ⚙️ CI steps & lifecycle hooks 🔒 Air-gapped & locked-down hosts

No Node.js, no Python, no `node_modules`. Why small matters & where it runs →

Benchmark

## Faster & leaner than Claude Code

Same model (claude-sonnet-4-6) on Apple Silicon, comparable feature set.

Metric | San | Claude Code | Advantage
--- | --- | --- | ---
Download size | 12 MB | 63 MB + Node 112 MB | 5× smaller
Disk footprint | 38 MB | 175 MB | 4.6× smaller
Startup time | ~0.01s | ~0.20s | 20× faster
Startup memory | ~32 MB | ~189 MB | 5.8× less
Simple task | ~2.4s / 39 MB | ~10.4s / 286 MB | 4.3× faster
Tool-use task | ~3.3s / 39 MB | ~26.0s / 285 MB | 7.9× faster

Go native compilation vs Node.js V8/JIT/GC overhead. Reproduce the numbers →

Get started

## Try it in 30 seconds

Open source under Apache 2.0. Star the repo if it's useful — it genuinely helps.

★ Star on GitHub Get started
Community

## Join the conversation

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关注公众号「极客外传」· 回复 san 或 三 入群

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