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Synapse RMCP MCP Server

local only

Synapse RMCP runs on your own machine — the client starts it, so there is no endpoint to ping. Last commit 10 Sep 2026.

Rust MCP and CLI server for Docker, host inspection, SSH, logs, ZFS, and safe file operations.

Installs per day peak 289 · avg 38 · -34% w/w
a month agotoday
—
Installs / week
npm · synapse-rmcp
2
Stars
1 open issue
10 Sep 2026
Last commit
from GitHub
AGPL-3.0
License
Rust

What changed 1

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 9 August 2026. No other catalogue keeps this.

9 Aug the owner changed

What the code does

We read the source, 4 d ago · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Checks whether it runs in a sandbox src/config.rs:299
    if std::path::Path::new("/.dockerenv").exists()
Runs an external command packages/synapse-rmcp/bin/synapse.js:18
  const install = spawnSync(process.execPath, [installer], { stdio: "inherit" });
Asks for container control access entrypoint.sh:128, .github/workflows/ci.yml:411
DOCKER_SOCK="${DOCKER_SOCK:-/var/run/docker.sock}"

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add synapse-rmcp -- npx -y synapse-rmcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "synapse-rmcp": {
      "command": "npx",
      "args": [
        "-y",
        "synapse-rmcp"
      ]
    }
  }
}
~/.codex/config.toml
[mcp_servers.synapse-rmcp]
command = "npx"
args = ["-y", "synapse-rmcp"]
.cursor/mcp.json
{
  "mcpServers": {
    "synapse-rmcp": {
      "command": "npx",
      "args": [
        "-y",
        "synapse-rmcp"
      ]
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "synapse-rmcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "synapse-rmcp"
      ]
    }
  }
}

Optional settings from the registry entry, left out of the block above: SYNAPSE_HOME (Optional Synapse appdata directory), SYNAPSE_HOSTS_CONFIG (Inline host topology as a JSON array), SYNAPSE_CONFIG_FILE (Path to a host configuration file), SYNAPSE_RMCP_VERSION (Optional GitHub release tag override for the downloaded Synapse binary), SYNAPSE_RMCP_REPO (Optional GitHub owner/repo override for release asset downloads), SYNAPSE_RMCP_RELEASE_BASE_URL (Optional release download base URL override), RUST_LOG (Tracing filter for Synapse logs).

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Synapse RMCP — questions

Answers built from our own checks of this server.

Why is there no uptime for Synapse RMCP?
Synapse RMCP runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package synapse-rmcp.
How do I connect Synapse RMCP?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls synapse-rmcp straight from npm; nothing to host, nothing to sign up for.
Is Synapse RMCP open source?
Yes — it is published under the AGPL-3.0 licence, written in Rust, 2 stars on GitHub and 1 open issue. The source link is on this page, so you can read exactly what it does with your data before you connect it.