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.).

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

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

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

PRs welcome.

Apache License 2.0