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steiner

A minimal, local-first Go coding agent with bounded context and sandboxed execution.

Quick start

Install a release binary, then see Getting started for the shortest local-model path. Provider and model setup covers provider connections and model references. CLI reference covers one-shot requests, commands, and interactive controls.

Features

• Local and cloud providers with one configuration shape. See Configuration.
• Bounded context through delegation, budgets, and compaction. See Context management.
• Async sub-agents: in interactive sessions sub_agent and follow_up return an ack immediately and each result arrives later as a separate message, so you can keep talking to the orchestrator while the conversation shows a Waiting state. In async sessions, calls sharing a group label deliver their results together; blocking calls return per-call. See Sub-agent delegation.
• Structured tools, optional language-server and MCP integrations. Read output omits line numbers by default; set line_numbers: true to include them. See Tools, LSP, and MCP.
• Plan/build execution modes and resumable autonomous runs. See Execution modes and Oneshot.
• Static, read-only security audits of a diff or repository, with adversarial verification. See Security audit.
• Sandboxed commands by default. See Sandboxing.
• Optional advisor, model discovery, image input, notifications, and cache statistics. See Optional features.

Safety

Review configuration before real work. Commands are sandboxed by default on Linux, but sandboxing is not a confidentiality boundary. --unsafe disables the sandbox. See Sandboxing. The first time steiner runs in a project directory, it asks you to trust that project, showing every way its .steiner/config.yaml would change your global config. See Project trust.

Documentation map

• Documentation home
• User documentation
• Internals
• Research

Contributing

Run make check before submitting changes. Contributor rules and architecture constraints are in AGENTS.md.