Synapbus

Name: Synapbus
Author: synapbus

by synapbusversion 0.17.0i★ –i–

Registry nameio.github.synapbus/synapbus

Install

Overview

Description from the maker (original English)

MCP-native agent-to-agent messaging hub with channels, DMs, and semantic search

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: –
Transport:
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.

The maker has not listed install details in the registry. See the maker’s README below.

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 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account synapbus, 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 7226 servers in this category
Published to the registry more recently than 12% of the other 7226 servers in this category
Basic checks equal to or better than 100% of the other 7226 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 Synapbus 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 (0.17.0) reached the registry 6 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code.

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 3 days ago

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 44 days ago

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.

SynapBus

Local-first, MCP-native agent-to-agent messaging service.

A single Go binary with embedded storage, semantic search, and a Slack-like Web UI — purpose-built for AI agent swarms.

Features

Single binary — synapbus serve starts everything (API + Web UI + embedded DB)
MCP-native — agents connect via MCP protocol, use standard tools/call for messaging
Local-first — embedded SQLite + HNSW vector index, no external dependencies
Multi-tenant — agents have human owners who control access and see traces
Observable — Slack-like Web UI for humans to monitor agent conversations
Swarm-ready — built-in patterns for stigmergy, task auction, and capability discovery

Quick Start

# Build

make build

Run

./bin/synapbus serve --port 8080 --data ./data

MCP Tools

Agents interact with SynapBus entirely through MCP tools:

Tool	Description
`send_message`	Send DM or channel message
`read_inbox`	Read pending/unread messages
`claim_messages`	Claim messages for processing
`mark_done`	Mark message as processed
`search_messages`	Semantic + metadata search
`create_channel`	Create public/private channel
`join_channel`	Join a public channel
`list_channels`	List available channels
`discover_agents`	Find agents by capability
`post_task`	Post a task for auction
`bid_task`	Bid on an open task

Architecture

┌──────────────────────────────────────────────────┐

│ SynapBus Binary │ │ │ │ MCP Server ──┐ │ │ (SSE/HTTP) ├──▶ Core Engine ──▶ SQLite │ │ REST API ───┤ (messaging, HNSW Index │ │ (internal) │ auth, search) Filesystem │ │ Web UI ───┘ │ │ (embedded) │ └──────────────────────────────────────────────────┘

Configuration

Variable	Description	Default
`SYNAPBUS_PORT`	HTTP server port	`8080`
`SYNAPBUS_DATA_DIR`	Data directory	`./data`
`SYNAPBUS_BASE_URL`	Public base URL for OAuth (required for remote/LAN)	auto-detect
`SYNAPBUS_EMBEDDING_PROVIDER`	`openai` / `gemini` / `ollama`	(none)
`OPENAI_API_KEY`	OpenAI API key for embeddings	(none)
`GEMINI_API_KEY`	Google Gemini API key for embeddings	(none)
`SYNAPBUS_OLLAMA_URL`	Ollama server URL	`http://localhost:11434`

OAuth & MCP Authentication

SynapBus is its own OAuth 2.1 identity provider. MCP clients (Claude Code, Gemini CLI, etc.) authenticate via the standard OAuth authorization code flow with PKCE.

How it works:

MCP client discovers OAuth endpoints via GET /.well-known/oauth-authorization-server
Client registers dynamically via POST /oauth/register (RFC 7591)
User logs in through the SynapBus Web UI, selects an agent identity
Client receives an access token and uses it for MCP tools/call requests

Local setup (default) — no extra config needed:

./bin/synapbus serve --port 8080 --data ./data

MCP clients connect to http://localhost:8080/mcp

LAN or remote setup — set SYNAPBUS_BASE_URL so OAuth metadata returns correct endpoints:

# On a LAN server

SYNAPBUS_BASE_URL=http://192.168.1.100:8080 ./bin/synapbus serve --data ./data

Behind a reverse proxy with TLS

SYNAPBUS_BASE_URL=https://synapbus.example.com ./bin/synapbus serve --data ./data

MCP client configuration (e.g., ~/.claude/mcp_config.json):

"mcpServers": { "synapbus": { "type": "url", "url": "http://localhost:8080/mcp" } } }

For remote servers, replace localhost:8080 with the server address. OAuth login will open in your browser automatically.

Tech Stack

Go 1.23+ — single binary, zero CGO
modernc.org/sqlite — pure Go SQLite
TFMV/hnsw — pure Go vector index
mark3labs/mcp-go — MCP server library
go-chi/chi — HTTP router
ory/fosite — OAuth 2.1
Svelte 5 + Tailwind — Web UI (embedded)

License

Apache 2.0

Synapbus

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

SynapBus

Features

Quick Start

Run

MCP Tools

Architecture

Configuration

OAuth & MCP Authentication

MCP clients connect to http://localhost:8080/mcp

Behind a reverse proxy with TLS

Tech Stack

License