Open-source alternative to Claude Code, built from scratch in Rust.

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Active Development — 4500+ tests · 24 crates · ~140k LOC

Crab Code is a Rust-native agentic coding CLI. It aligns with Claude Code's toolset, permission model, and interaction patterns while supporting any LLM provider (Anthropic / OpenAI / DeepSeek / Ollama / Bedrock / Vertex, etc.).

Quick Start

git clone https://github.com/lingcoder/crab-code.git && cd crab-code
cargo build --release
export ANTHROPIC_API_KEY=sk-ant-...

./target/release/crab                   # Interactive TUI
./target/release/crab "explain this codebase"   # Single-shot
./target/release/crab -p "fix the bug"  # Non-interactive

See crab --help for more. Config: ~/.crab/settings.json

Comparison

	Crab Code	Claude Code	OpenCode	Codex CLI
Open Source	Apache 2.0	Proprietary	MIT	Apache 2.0
Language	Rust	TypeScript	TypeScript	Rust
Models	Any provider	Anthropic	Any provider	OpenAI only
MCP	3 transports	6 transports	LSP	2 transports

Architecture

24 Rust crates in 4 layers. See docs/architecture.md for details.

Entry     cli · daemon
Engine    agent · engine · session · tui · remote
Service   api · tools · mcp · skill · plugin · telemetry · ide · sandbox · job · acp
Foundation core · common · config · auth · fs · memory · process

Build & Test

cargo build --workspace
cargo test --workspace
cargo clippy --workspace -- -D warnings

Contributing

PRs welcome.

License

Apache License 2.0