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notebrain-cli
Pricing
- Model
- Free
Summary
Your Obsidian vault has ten thousand notes and semantic search that amounts to grep — the connections you need exist in the graph, but nothing surfaces them when a coding agent asks a question. NoteBrain CLI was built to close that gap.
NoteBrain indexes your Markdown notes into a local ChromaDB vector database and gives you semantic search, wikilink graph traversal, and hidden-connection discovery through structured CLI output. Every bit of it runs on your machine — no API calls, no cloud dependency, no data leaving the host. The structured output is designed to be consumed directly by shell pipelines or LLM tool-use workflows, which means a coding agent can query your vault the same way it queries a function. The ceiling appears when your query logic needs to span multiple hops or filter by metadata at scale — ChromaDB local mode is not a production vector database, and the index will need a rebuild whenever the vault structure shifts significantly.
Bottom line: Bet on NoteBrain CLI when you need a fully offline RAG backend for a personal vault or a local agent setup — plan around it when you need multi-tenant access, a persistent API endpoint, or a vector store that survives frequent large-scale vault restructuring without a full reindex.
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Pros
Sign in to edit- Fully local ChromaDB indexing with zero network calls, so your vault contents never touch an external server — which matters when notes contain unpublished code, client context, or anything you cannot route through a third-party API.
- Structured CLI output designed for agent tool-use, so a coding agent can query your vault the same way it calls a function — rather than scraping unformatted text and hoping the LLM parses it correctly.
- Wikilink graph traversal alongside semantic search, so you get two retrieval signals instead of one — structurally connected notes surface even when the embedding similarity score would have missed them.
- MIT license with self-hosted operation, so there is no vendor lock-in, no pricing gate on features, and no dependency on a service that can change its terms or go offline.
- Ships with an agent skill definition and OpenCode integration documented in the repository, so wiring it into an existing agent setup does not require building the tool-call interface from scratch.
Cons
Sign in to edit- There is no persistent HTTP API — the CLI is the only interface, which means any workflow that needs a long-running queryable endpoint (a web app, a multi-agent system polling for context, a teammate's machine) cannot use NoteBrain without wrapping it in a custom server layer that the project does not provide.
- The local ChromaDB backend is not designed for large-scale or high-frequency writes: when vault structure changes significantly, the index requires a rebuild, and teams with vaults that evolve rapidly report that the rebuild cycle interrupts agent workflows that depend on fresh results.
- A team whose vault scales to tens of thousands of frequently-updated notes, or whose agents need concurrent read access from multiple processes, will hit local ChromaDB's performance and concurrency limits — at that point, the path forward is a dedicated vector database (Qdrant, Weaviate, or a hosted alternative) with a custom ingestion pipeline, which means migrating off NoteBrain entirely.
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About
- Platforms
- Linux (binaries); source compiles on other platforms
- API Available
- No
- Self-Hosted
- Yes
- Last Updated
- 2026-07-21T09:01:26.287Z
Best For
Who it's for
- Obsidian power users seeking local semantic search
- Developers building agentic coding setups
- Users who want fully offline Markdown knowledge bases
What it does well
- Semantic retrieval from personal Obsidian vaults
- Graph-based exploration of note connections
- Providing structured knowledge context to autonomous coding agents
- Offline RAG backend for local LLM workflows
Integrations
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Frequently Asked Questions
- Is notebrain-cli free?
- Yes — notebrain-cli is fully free to use. There is no paid tier.
- Is notebrain-cli open source?
- Yes. notebrain-cli is open source.
- Can I self-host notebrain-cli?
- Yes. notebrain-cli supports self-hosting on your own infrastructure.
- What platforms does notebrain-cli support?
- notebrain-cli is available on: Linux (binaries); source compiles on other platforms.
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NoteBrain CLI is a Go-based command-line tool that converts an Obsidian vault or any folder of Markdown files into a queryable knowledge backend. The core workflow: the CLI indexes notes into a local ChromaDB vector database, then exposes three retrieval modes — semantic search, wikilink graph traversal, and hidden-connection discovery — all returning structured output that can be piped directly into another process or consumed by an LLM tool-use call.
The differentiating feature is the combination of vector similarity and graph traversal in a single local tool. Most local RAG setups stop at embedding similarity; NoteBrain adds wikilink-aware graph walking, so a query can surface notes that are semantically adjacent and notes that are structurally connected through your own links — two different signals that often return different results. The vendor states this is specifically designed so autonomous coding agents can query the vault as a structured tool, not just a text dump.
The tool fits tightly into offline or air-gapped developer workflows: a coding agent that needs domain context, a local LLM that needs a knowledge grounding layer, or an Obsidian power user who wants CLI-level search without leaving the terminal. It breaks down when you need a persistent HTTP API (there is none — the CLI is the interface), when multiple processes need concurrent access, or when the vault grows to a scale where local ChromaDB performance degrades and a rebuild cycle becomes disruptive. Teams that hit that ceiling move to a hosted or self-managed vector database with a proper ingestion pipeline.
The repository ships with an AI agent skill definition and documented integration with OpenCode, confirming the tool is explicitly designed to sit inside an agent’s tool-use chain rather than as a standalone search UI. It is MIT-licensed and self-hosted by definition — there is no hosted option and no server component.