Openbuild — AI skill for Claude Code

openbuild

Model-agnostic agent shell. Single Rust binary. No vendor lock-in.

[](LICENSE) [](#)

Why

Every AI lab is shipping its own dev shell — and every shell speaks the same shape: prompt, tools, subagents, MCP, skills, hooks, plugins, marketplaces. The model is interchangeable. The harness is what people actually use.

openbuild is the universal harness:

• Any model. OpenAI, Anthropic, xAI, Ollama, OpenRouter, Bedrock, Vertex, llama.cpp — same CLI, same flags.
• Any config. Imports Claude Code, Cursor, Codex, OpenCode, Aider, Cline, and the generic AGENTS.md. Bring your existing setup.
• No phone-home. No proxy. No telemetry. No auto-update calls.
• Reusable primitives. Roles, personas, agents, skills — composable, forkable, CC0.

Status

Pre-alpha. M0 scaffolded.

Milestone	Scope	State
M0	core loop + OpenAI-compatible provider + read_file + run_terminal_cmd + jsonl sessions	in progress
M1	provider matrix (Anthropic, xAI, Ollama, OpenRouter) + reasoning_effort routing	pending
M2	TUI + permission engine + universal config import + MCP stdio	pending
M3	sandbox (macOS+Linux) + subagent + skills + worktree + best-of-N	pending

Quick start

cargo install --git https://github.com/rohitg00/openbuild openbuild-cli

# OpenAI
OPENBUILD_API_KEY=sk-... openbuild -p "explain this codebase"

# Anthropic via base_url override
OPENBUILD_BASE_URL=https://api.anthropic.com/v1 \
OPENBUILD_API_KEY=sk-ant-... \
openbuild -m claude-sonnet-4-6 -p "..."

# Ollama (no key needed)
OPENBUILD_BASE_URL=http://localhost:11434/v1 \
openbuild -m llama3 -p "..."

# xAI
OPENBUILD_BASE_URL=https://api.x.ai/v1 \
OPENBUILD_API_KEY=xai-... \
openbuild -m grok-4 -p "..."

Architecture

openbuild-cli              # binary, clap wiring
openbuild-core             # Provide