Axiom

Overview

Axiom is a powerful terminal-based coding agent inspired by Claude Code CLI. It features a premium TUI with streaming responses, multi-provider LLM support (OpenCode, Anthropic, OpenAI, Google, Groq, xAI, Cerebras), tool execution with security validation, vim mode, collapsible thinking panels, and session management with branching support. Built as a monorepo with separate packages for AI, agent-core, TUI, and the coding agent itself.

Features

• Premium TUI with Claude Code CLI-style interface and 60fps rendering
• Multi-provider support — OpenCode, Anthropic, OpenAI, Google, Groq, xAI, Cerebras
• Tool execution — read, write, bash, edit, grep, find, ls, mkdir with security validation
• Security-first design — dangerous command detection, path validation, read-only checks
• Full vim keybindings (i, Esc, h/j/k/l, w, b, dd, dw)
• Collapsible thinking panel — Tab key to toggle reasoning display
• Session management with JSONL persistence and branching support

Challenges

• Building a 60fps terminal UI framework with dirty region optimization
• Implementing consistent tool execution across multiple LLM providers with different API characteristics
• Security validation — accurately detecting dangerous commands without blocking legitimate ones
• Session branching — managing complex conversation trees with JSONL persistence

Learnings

• Terminal UI rendering techniques including frame-based rendering and dirty region optimization
• Multi-provider LLM abstraction — handling different streaming formats, token limits, and error modes
• Security-first tool execution design patterns
• Monorepo architecture with shared packages and build orchestration