coding-mojolisted

# Mojo Development in Claude.ai Containers Mojo is a systems programming language from Modular that combines Python-like syntax with C-level performance. This skill handles container setup and execution. For **language syntax and semantics**, defer to Modular's official skills at `github.com/modular/skills` — they are authoritative correction layers for pretrained knowledge. ## Installation Install once per session (~20s via uv, ~500MB). Skip if already installed. ```bash if mojo --version 2>/dev/null; then echo "Mojo already installed" else # Compiler binary without ML extras (~350MB saved) uv pip install --system --break-system-packages modular --no-deps 2>&1 | tail -5 # Entry points + base deps (numpy, pyyaml, rich) uv pip install --system --break-system-packages mojo max 2>&1 | tail -5 mojo --version fi ``` Verify: ```bash echo 'def main(): print("Mojo ready")' > /tmp/_verify.mojo && mojo /tmp/_verify.mojo ``` ## Running Mojo Code **Quick tests** (write to temp file): ```bash cat > /tmp/test.mojo << 'EOF' def main(): print("hello") EOF mojo /tmp/test.mojo ``` **File execution** (JIT compile + run, ~1.4s overhead): ```bash cat > /home/claude/example.mojo << 'EOF' def main(): print("Hello from Mojo") EOF mojo /home/claude/example.mojo ``` **Build binary** (for benchmarking — ~6s cold compile, but binary runs at native speed): ```bash mojo build /home/claude/example.mojo -o /home/claude/example /home/claude/example ``` Use `mojo build` for bench