Octobrain

Name: Octobrain
Author: muvon

by muvonversion 0.15.1i★ –iRuns on your computer

Registry nameio.github.Muvon/octobrain

Install

Overview

Description from the maker (original English)

Persistent memory for AI assistants with semantic search and knowledge graph relationships.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Search & AI memory

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Download the maker’s .mcpb file

The link goes to the maker’s own file; we do not host or repackage it. Open the file and Claude Desktop installs it.

Run this in your terminal

claude mcp add octobrain -- npx -y @muvon/octobrain mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "octobrain": {
      "command": "npx",
      "args": [
        "-y",
        "@muvon/octobrain",
        "mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "octobrain": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@muvon/octobrain",
        "mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account muvon, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Search & AI memoryi

More stars than 0% of the other 7251 servers in this category
Published to the registry more recently than 90% of the other 7251 servers in this category
Basic checks equal to or better than 100% of the other 7251 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Octobrain safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.15.1) reached the registry 3 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js, MCPB on your computer.

What can I use instead?

In the same category: Context7, Codebase Memory, Exa

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Context7

by upstash

Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.

Computer or cloud★ 64,224MITUpdated today

Install

Codebase Memory

by DeusData

Codebase knowledge graph for AI agents — 162 languages, sub-ms queries, 99% fewer tokens.

Runs on your computer★ 48,148MITUpdated 20 days ago

Install

Exa

by exa-labs

Connect AI agents to Exa for web search, content fetching, and multi-step research.

Runs in the cloud★ 5,213MITUpdated last month

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Octobrain

Persistent memory for AI assistants — store insights, decisions, and knowledge that survives across conversations.

_MCP Registry: mcp-name: io.github.Muvon/octobrain_

Why Octobrain?
Quick Start
Installation
Usage
Features
Benchmarks
Configuration
Memory Types
MCP Integration
Storage Locations
Contributing
License

Octobrain gives your AI assistant a long-term memory. Store code insights, architecture decisions, bug fixes, and knowledge — then retrieve them with semantic search in future sessions. Works as a CLI tool or as an MCP server for integration with Claude Desktop and other AI tools.

Why Octobrain?

AI assistants start every conversation with zero context. You explain your project, your preferences, your decisions — every single time. Octobrain breaks that cycle:

Persistent memory — Insights survive across sessions, not just within them
Semantic search — Find memories by meaning, not exact keywords
Auto-linking — Related memories connect automatically (Zettelkasten-style)
Knowledge indexing — Ingest docs, articles, and files for retrieval
MCP integration — Works with Claude Desktop and other MCP-compatible tools

Quick Start

# Install from crates.io

cargo install octobrain

Store your first memory

octobrain memory memorize --title "API Design Pattern" \ --content "Use REST for CRUD, GraphQL for complex queries" \ --memory-type architecture --tags "api,design"

Search memories

octobrain memory remember "how should I design APIs"

Start MCP server for Claude Desktop integration

octobrain mcp

Installation

From crates.io (Recommended)

cargo install octobrain

From Source

# Clone and build

git clone https://github.com/muvon/octobrain.git cd octobrain cargo build --release

Binary location

./target/release/octobrain --help

Docker

docker pull ghcr.io/muvon/octobrain:latest

Homebrew (macOS/Linux)

brew install muvon/tap/octobrain

Feature Flags

Octobrain supports multiple embedding providers:

Flag	Description	API Key Required
`fastembed`	Local embeddings via FastEmbed	No
`huggingface`	Local embeddings via HuggingFace	No
(default)	Both `fastembed` + `huggingface`	No
(no features)	API-based: Voyage, OpenAI, Google, Jina	Yes

# Build with local embeddings (default, no API keys needed)

cargo build --release

Build with API-based embeddings only

cargo build --no-default-features --release

For API-based embeddings, set the appropriate environment variable:

VOYAGE_API_KEY for Voyage AI
OPENAI_API_KEY for OpenAI
GOOGLE_API_KEY for Google
JINA_API_KEY for Jina

Usage

Memory Management

Store and retrieve insights, decisions, and context:

All memory subcommands accept global flags:

--scope — Override project scope (default: auto-detected from Git remote)
--role — Filter by role (e.g. "developer", "reviewer")

# Store a memory

octobrain memory memorize --title "API Design" \ --content "Use REST for CRUD, GraphQL for complex queries" \ --memory-type architecture --tags "api,design"

Search memories (semantic search)

octobrain memory remember "api design patterns"

Multi-query search for broader coverage

octobrain memory remember "authentication" "security" "jwt"

Get a memory by ID

octobrain memory get

Get recent memories

octobrain memory recent --limit 20

Filter by type

octobrain memory by-type architecture --limit 10

Filter by tags

octobrain memory by-tags "api,security"

Find memories related to files

octobrain memory for-files "src/main.rs,src/lib.rs"

Update a memory

octobrain memory update --title "New Title" --add-tags "new-tag"

Delete a memory

octobrain memory forget --memory-id

Get memories relevant to the current Git commit

octobrain memory current-commit

Show memory statistics

octobrain memory stats

Clean up old/low-importance memories

octobrain memory cleanup

Compact tables and refresh indices (run when searches slow down)

octobrain memory maintenance

⚠️ Delete ALL memory data

octobrain memory clear-all --yes

Memory Consolidation

Close a goal and fold all its contributing memories into a consolidated summary:

# Consolidate a goal (Achieves-link sources → Consolidated state, importance dampened)

octobrain memory consolidate --summary "Final summary"

Sleep consolidation: auto-cluster recent similar memories

octobrain memory sleep-consolidate --threshold 0.85 --min-size 3

Memory Relationships

Connect related memories for context-rich retrieval:

# Create a relationship between memories

octobrain memory relate \ --relationship-type "depends_on" \ --description "Source requires target to function"

View relationships for a memory

octobrain memory relationships

Find related memories through relationships

octobrain memory related

Auto-link similar memories (Zettelkasten-style)

octobrain memory auto-link

Explore memory graph

octobrain memory graph --depth 2

Knowledge Base

Index and search web content, docs, and files:

# Index a URL

octobrain knowledge index https://docs.rs/tokio/latest/tokio/

Index a local file (.txt, .md, .pdf, .docx, .html)

octobrain knowledge index ./docs/architecture.md

Search knowledge base

octobrain knowledge search "how to handle async tasks"

Search within a specific source (auto-indexes if outdated)

octobrain knowledge search "spawn blocking" --source https://docs.rs/tokio/

Read full content of a URL or local file

octobrain knowledge read https://docs.rs/tokio/latest/tokio/

Search indexed content by regex pattern

octobrain knowledge match "spawn_blocking|block_in_place"

Store raw text content

octobrain knowledge store "meeting-notes" --content "Discussion points..."

List indexed sources

octobrain knowledge list --limit 20

Show statistics

octobrain knowledge stats

Delete a source

octobrain knowledge delete https://example.com/docs

Delete stored content by key

octobrain knowledge delete-stored "meeting-notes"

Knowledge Boxes

Import and sync git-backed knowledge bundles scoped to your projects:

# Import a remote git repo as a knowledge box

octobrain box import https://github.com/org/docs-repo.git

Import at global scope (visible in every project)

octobrain box import https://github.com/org/docs-repo.git --global

Pull and re-index all subscribed boxes + local .box/ directories

(the MCP server syncs each session's repos on first contact; agents run `knowledge` `sync` after editing .box/)

octobrain box sync

List subscribed boxes

octobrain box list

Remove a box

octobrain box remove github.com/org/docs-repo

MCP Server

Run as an MCP server for integration with Claude Desktop and other AI tools:

# Start with stdio transport (for Claude Desktop)

octobrain mcp

Start with HTTP transport (for web-based tools)

octobrain mcp --bind 0.0.0.0:12345

Available MCP Tools:

Tool	Description
`memorize`	Store memories with metadata; optional `related_to` for inline relationships
`remember`	Semantic search with filters; returns 1-hop graph neighbors
`forget`	Delete memories (requires confirmation)
`knowledge`	Unified tool: `search`, `store`, `delete`, `read`, `match`, `sync` via `command` field; `sync` re-indexes knowledge boxes after `.box/` edits

See MCP Integration for Claude Desktop setup.

Features

Semantic Search — Find memories by meaning using vector embeddings, not exact keyword matches
Hybrid Search — Combines BM25 full-text search with vector similarity for better results
Reranking Support — Pluggable cross-encoder reranking stage (provider-dependent)
Auto-Linking — Automatically connects semantically similar memories (Zettelkasten-style)
Temporal Decay — Ebbinghaus forgetting curve for importance management
Knowledge Indexing — Ingest URLs, PDFs, docs for retrieval
Project Scoping — Isolate memories per Git project or share across projects
Role Filtering — Tag memories by role (developer, reviewer, etc.)
Query Expansion (HyDE-lite) — Pseudo-relevance feedback for +10-30% recall on long-tail queries
MCP Protocol — Full MCP 2026-07-28 compliance for AI tool integration

Benchmarks

Retrieval quality of octobrain's knowledge system on standard BEIR datasets — nDCG@10, fully local, no LLM judge, using the harness's default embedder bge-small-en-v1.5 (384-dim, 33M params). Each corpus passage is indexed through octobrain's real retrieval path and scored against the official qrels (metrics reproduce pytrec_eval).

Dataset	octobrain vector	octobrain hybrid	BM25¹	bge-small-en-v1.5²
SciFact (5.2K docs, 300 q)	0.722	0.742	0.665	0.713
NFCorpus (3.6K docs, 323 q)	0.341	0.363	0.325	0.343

vector = dense-only retrieval; reproduces the embedder's published BEIR numbers (validates the harness).
hybrid = BM25 + vector fused with Reciprocal Rank Fusion (k=60) — octobrain's default. Adds +2 nDCG@10 over the bare embedding and beats classic BM25 on both datasets.

¹ Canonical BM25 from the BEIR paper (Anserini/Lucene, k1=0.9 b=0.4). ² From the bge-small-en-v1.5 model card (MTEB).

Scope: this measures the ranking layer (embedding + BM25 fusion + reranking). BEIR passages are pre-chunked, so octobrain's chunking strategy is not exercised here.

⚠️ Reranker status: The cross-encoder reranker is currently a no-op with fastembed models (byte-identical results to hybrid-only). Rerank is excluded from the numbers above pending investigation. See benches/README.md for details.

Reproduce (downloads the datasets, builds a release binary, runs fully offline):

cd benches && bash scripts/run_retrieval.sh

Configuration

Configuration is stored in ~/.local/share/octobrain/config.toml. The template written on first run defines every option with sensible defaults, but loading is strict — a field you delete by hand causes startup to fail rather than falling back to a default.

Override the config location with OCTOBRAIN_CONFIG_PATH=/path/to/config.toml.

Key Settings

Section	Option	Default	Description
`[embedding]`	`model`	`fastembed:Qdrant/all-MiniLM-L6-v2-onnx`	Embedding model (provider:model format). Default is a local fastembed model — no API key, runs on CPU.
`[search]`	`similarity_threshold`	`0.3`	Minimum relevance (0.0-1.0)
`[search.hybrid]`	`enabled`	`true`	Enable BM25 + vector fusion

| [search.reranker] | enabled | `

Only the beginning is shown; read the rest in the repo

Octobrain

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Search & AI memoryi

Common questions

Alternatives

Context7

Codebase Memory

Exa

README from the maker

Octobrain

Table of Contents

Why Octobrain?

Quick Start

Store your first memory

Search memories

Start MCP server for Claude Desktop integration

Installation

From crates.io (Recommended)

From Source

Binary location

Docker

Homebrew (macOS/Linux)

Feature Flags

Build with API-based embeddings only

Usage

Memory Management

Search memories (semantic search)

Multi-query search for broader coverage

Get a memory by ID

Get recent memories

Filter by type

Filter by tags

Find memories related to files

Update a memory

Delete a memory

Get memories relevant to the current Git commit

Show memory statistics

Clean up old/low-importance memories

Compact tables and refresh indices (run when searches slow down)

⚠️ Delete ALL memory data

Memory Consolidation

Sleep consolidation: auto-cluster recent similar memories

Memory Relationships

View relationships for a memory

Find related memories through relationships

Auto-link similar memories (Zettelkasten-style)

Explore memory graph

Knowledge Base

Index a local file (.txt, .md, .pdf, .docx, .html)

Search knowledge base

Search within a specific source (auto-indexes if outdated)

Read full content of a URL or local file

Search indexed content by regex pattern

Store raw text content

List indexed sources

Show statistics

Delete a source

Delete stored content by key

Knowledge Boxes

Import at global scope (visible in every project)

Pull and re-index all subscribed boxes + local .box/ directories

(the MCP server syncs each session's repos on first contact; agents run knowledge sync after editing .box/)

List subscribed boxes

Remove a box

MCP Server

Start with HTTP transport (for web-based tools)

Features

Benchmarks

(the MCP server syncs each session's repos on first contact; agents run `knowledge` `sync` after editing .box/)