🦀 Kwen Agent Harness

A fast, native Rust CLI agent harness inspired by Qwen Code & Claude Code, crafted specifically for smaller Qwen Models (Qwen 3.5 9B, Qwen 3 35B A3B, Qwen 2.5 Coder 7B/14B/32B), powered by LM Studio and extensible with MCP Add-Ons and Skills.

✨ Features & Aesthetic

• Qwen Code & Claude Code Inspired UI:
  • Clean rounded framed banners, status cards, and live visual cues (⚡ Tool Call, ↳ Result, ● Thinking).
  • Elegant prompt (kwen ❯ ) with Tab auto-completion and inline ghost suggestions for all / commands and skills.
• Dedicated Slash Commands:
  • /context: Visual breakdown of message history, character breakdown (system/user/assistant/tools), and estimated token count against small context limits.
  • /settings: View current LM Studio provider URL, active model, sampling temperature, max tokens, and adjust them dynamically on the fly (/set temp 0.1, /set model <name>).
  • /skills: Browse installed specialized prompt engineering and workflow skills.
  • /skill <name>: Instantly inject specialized workflows (e.g. code-reviewer, bug-hunter, rust-optimizer, unit-tester).
  • /tools: Inspect active built-in tools and connected MCP Add-Ons.
  • /clear: Reset conversation context.
  • /help: Quick command reference card.
• Skills System:
  • Skills are stored in user config markdown files (~/.config/kwen/skills/*.md).
  • Edit or add any new custom skill in Markdown with YAML frontmatter:

    ---
    name: sql-expert
    description: Writes optimized Postgres queries and indexes
    ---
    # Instructions here...

• Built-in Tools:
  • read_file, write_file, edit_file, list_dir, execute_command, grep_search, find_files.
• MCP (Model Context Protocol) Add-Ons & Library:
  • Curated Add-On library (kwen mcp library) with 1-click install (kwen mcp install <id>).
  • Supports SQLite, Fetch/Scraping, Git, Filesystem, GitHub, Memory, etc.

🚀 Quick Usage

Start Interactive Chat REPL

kwen chat
# or with specific model
kwen --model "qwen3.5-9b" chat

Try Slash Commands in REPL

• Press Tab on / to see all auto-completable commands.
• Run /context to check context size and message distribution.
• Run /settings to see and adjust runtime parameters.
• Run /skill code-reviewer to focus the agent on deep code review.
• Run /set temp 0.1 to lock in lower sampling temperature.
• Run /exit or Ctrl+C to quit.

MCP Management

kwen mcp library            # Browse curated addons
kwen mcp install fetch      # Install web scraping MCP
kwen mcp list               # View installed addons