secondbrain-os 0.5.1

Local-first agent runtime and SDK for grounded retrieval, durable memory, governed tools, and auditable agent workflows.

SecondBrain

SecondBrain is a local-first agent runtime and SDK for grounded retrieval, durable memory, governed tools, and auditable agent workflows.

It is designed for builders who want a local runtime that can ingest private material, retrieve it with citations, run governed tools, keep durable session state, and expose the same memory surface through CLI, SDK, HTTP, and MCP.

Install

SecondBrain supports Python 3.12 and 3.13.

pip install secondbrain-os

For the full local retrieval stack, including the default LanceDB backend and bundled embedding/reranking dependencies:

pip install "secondbrain-os[local]"

For all optional providers, vector backends, parsers, integrations, and sandbox extras:

pip install "secondbrain-os[all]"

First Commands

sb --help
sb onboard --vault "$PWD/vault" --approval-mode safe --skip-knowledge --skip-index
sb ingest vault/
sb context index
sb ask "What changed this week?" --no-synthesize

Provider-backed synthesis is optional. The local retrieval path can return citation-first answers before you configure external model credentials.

Core Surfaces

• sb: local CLI for setup, ingest, retrieval, chat, workflows, governance, quality checks, and operator workflows.
• brain.sdk: Python facade for local and HTTP-backed integrations.
• Memory API v1: HTTP routes and MCP tools for recall, context packs, grounded answers, decisions, open loops, and audit-friendly citations.
• Runtime assets: packaged prompts, contracts, migrations, and static serve UI files needed after installation.

Documentation

• Documentation
• Quickstart
• Memory API
• PyPI