14days-build-claude-code-cli

Skill by ara.so — Devtools Skills collection.

A 14-day tutorial project for building a production-grade code agent CLI from scratch in Python. Learn to implement the "harness" layer around LLMs: tool calling, file operations, permission systems, session management, and agent orchestration patterns inspired by Claude Code.

What It Is

This is an educational implementation of a Code Agent CLI called agent-code. Over 14 days, you build:

• CLI runtime with REPL and slash commands
• Agent loop with tool calling (Anthropic Messages API format)
• File search, read, and safe edit with diff preview
• Bash command execution with permission engine
• Session persistence and project memory
• Hooks, skills, subagents, and MCP tool integration
• Worktree isolation for multi-task workflows

Default model: Uses DeepSeek's Anthropic-compatible endpoint for cost-effective testing, but works with any Anthropic Messages API compatible service (Claude, etc.)