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
1 maintainer
Release files for secondbrain-os 0.5.1
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| secondbrain_os-0.5.1.tar.gz | 4.8 MB | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| secondbrain_os-0.5.1-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 10.5 MB
Release files / secondbrain_os-0.5.1.tar.gz
| Download URL | secondbrain_os-0.5.1.tar.gz |
|---|---|
| Size | 4.8 MB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
c4024bdca37a6dd68c9d4e6d708510e6e813695368e01d448e097b24370e080c
|
|
BLAKE2b-256 checksum How to use checksums |
f6254e72299e325847e76df72a87ae8337c5523e4b74f4e5fe81918b39adb274
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/6.1.0 CPython/3.13.12
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Jun 1, 2026.
Transparency logRelease files / secondbrain_os-0.5.1-py3-none-any.whl
| Download URL | secondbrain_os-0.5.1-py3-none-any.whl |
|---|---|
| Size | 5.7 MB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
ebe5d8118281739daebf7b9eb75bcbc52b9b67fa0145a8dacbad106937e4b562
|
|
BLAKE2b-256 checksum How to use checksums |
63488e3e95b285c3ca894be2b0c4b0b092b81833c880c1c6bb7dba977ab8f054
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/6.1.0 CPython/3.13.12
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Jun 1, 2026.
Transparency log
