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@simplelittledev/fastcode
@simplelittledev/fastcode/dist/index.js

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Readme

⚡ FastCode

A colorful, fast, terminal-first AI coding assistant.

Multi-LLM chat • Agent Skills • Slash commands • Themes • Termux-ready

npm install -g @simplelittledev/fastcode
fastcode

Short alias included:

fc

🌈 What Is FastCode?

FastCode is a beautiful TUI coding assistant that runs inside your terminal. It connects to your favorite AI provider, keeps the workflow command-driven, and supports Anthropic-style Agent Skills for specialized abilities.

It is built for developers who want an AI assistant that feels quick, direct, and usable from anywhere: Linux, macOS, Windows, and Android through Termux.

✨ Highlights

Feature	What You Get
🎨 Colorful TUI	Big FastCode banner, themes, transcript bubbles, status bar
🤖 Multi-provider	Anthropic, OpenAI, Gemini, OpenRouter, Groq, DeepSeek, Mistral, Ollama
🧠 Agent Skills	Install and enable `SKILL.md` powered workflows
⚡ Slash commands	Switch models, manage keys, enable skills, inspect config
📱 Termux-ready	Stable UI mode helps avoid flicker on Android terminals
🔐 Local config	Keys and preferences stay under `~/.fastcode`

🚀 Install

Global install

npm install -g @simplelittledev/fastcode
fastcode

Run without installing globally

npx @simplelittledev/fastcode

Start with a prompt

fastcode "explain this repository"

🔑 Add Your API Key

Use environment variables:

export ANTHROPIC_API_KEY="sk-ant-..."
export OPENAI_API_KEY="sk-..."
export OPENROUTER_API_KEY="sk-or-..."

Or save a key from inside FastCode:

/login openai sk-...
/login anthropic sk-ant-...

Then start chatting:

fastcode

🧩 Providers

Provider	Default Model	Auth
`anthropic`	`claude-3-5-sonnet-latest`	`ANTHROPIC_API_KEY` or `CLAUDE_API_KEY`
`openai`	`gpt-4o-mini`	`OPENAI_API_KEY`
`google`	`gemini-1.5-flash`	`GEMINI_API_KEY` or `GOOGLE_API_KEY`
`openrouter`	`anthropic/claude-3.5-sonnet`	`OPENROUTER_API_KEY`
`groq`	`llama-3.3-70b-versatile`	`GROQ_API_KEY`
`deepseek`	`deepseek-chat`	`DEEPSEEK_API_KEY`
`mistral`	`mistral-small-latest`	`MISTRAL_API_KEY`
`ollama`	`llama3.2`	Local, no API key required

Switch anytime:

/provider openai
/model gpt-4o-mini

🪄 Agent Skills

FastCode can install and inject Anthropic-style skills into the system prompt.

/skills search pdf
/skills install pdf
/skills install anthropics/skills/pdf
/skills install https://example.com/my-skill/SKILL.md
/skills enable pdf
/skills list
/skills info pdf

Installed skills live here:

~/.fastcode/skills/<name>/SKILL.md

🎮 Slash Commands

Command	Action
`/help`	Show command list
`/provider [id]`	List or switch provider
`/model [id]`	List or switch model
`/login <provider> <key>`	Save API key
`/logout <provider>`	Remove API key
`/skills ...`	Search, install, enable, disable, list skills
`/theme [id]`	Switch theme
`/cost`	Show token and cost usage
`/system [text]`	Show or update system prompt
`/whoami`	Show configured provider keys
`/config`	Print config and paths
`/clear`	Clear conversation
`/reset`	Reset config
`/about`	Show version and platform
`/exit`	Quit

Keyboard controls:

Esc       cancel streaming
Ctrl+C    press twice to quit

🎨 Themes

/theme fastcode
/theme neon
/theme sunset
/theme matrix
/theme mono

Want the calmest terminal experience?

FASTCODE_STABLE_UI=1 fastcode

Termux enables stable UI automatically.

📱 Termux

Install Node.js first:

pkg install nodejs
npm install -g @simplelittledev/fastcode
fastcode

If the command is not found, check your npm global binary path:

npm bin -g
echo "$PATH"

FastCode stores config inside your home directory:

~/.fastcode/
├── config.json
├── auth.json
├── skills/
├── cache/
├── sessions/
└── logs/

You can move that root with:

FASTCODE_HOME=/path/to/fastcode fastcode

🛠️ Development

git clone https://github.com/SimpleLittleDev/FastCode
cd FastCode
npm install
npm run dev

Quality checks:

npm test
npm run typecheck
npm run lint
npm run build

Run the built CLI:

node ./bin/fastcode.mjs

📦 Publish Notes

The package exposes two global commands:

{
  "bin": {
    "fastcode": "./bin/fastcode.mjs",
    "fc": "./bin/fastcode.mjs"
  }
}

Publish public scoped releases with:

npm publish --access public

@simplelittledev/fastcode