Spawner

Name: Spawner
Author: Flosk6

by Flosk6version 2.2.1i★ –iRuns on your computer

Registry nameio.github.Flosk6/spawner

Install

Overview

Description from the maker (original English)

Preview environments on your self-hosted Spawner server: a copy of your app for each git branch

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: Developer tools
You need to fill in: SPAWNER_TOKEN

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).
You fill in yourself: SPAWNER_URL, SPAWNER_TOKEN

Values marked secret are keys to your account. Never share them or paste them into a chat.

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 …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "spawner": {
      "command": "npx",
      "args": [
        "-y",
        "spawner-cli",
        "mcp"
      ],
      "env": {
        "SPAWNER_URL": "your-value",
        "SPAWNER_TOKEN": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add spawner --env SPAWNER_URL=your-value --env SPAWNER_TOKEN=your-value -- npx -y spawner-cli mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "spawner": {
      "command": "npx",
      "args": [
        "-y",
        "spawner-cli",
        "mcp"
      ],
      "env": {
        "SPAWNER_URL": "your-value",
        "SPAWNER_TOKEN": "your-value"
      }
    }
  }
}

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": {
    "spawner": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "spawner-cli",
        "mcp"
      ],
      "env": {
        "SPAWNER_URL": "your-value",
        "SPAWNER_TOKEN": "your-value"
      }
    }
  }
}

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.

Values you fill in

SPAWNER_URL env
Address of your Spawner server's dashboard, such as https://spawner.preview.example.com. Without it, the server of spawner login
SPAWNER_TOKEN secret env
Personal API token (spn_...), from spawner token create or the dashboard. Without it, the token of spawner login

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 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Flosk6, 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 Developer toolsi

More stars than 0% of the other 1385 servers in this category
Published to the registry more recently than 65% of the other 1385 servers in this category
Basic checks equal to or better than 100% of the other 1385 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 Spawner 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?

You need to fill in: SPAWNER_TOKEN

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 (2.2.1) reached the registry 26 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 on your computer.

What can I use instead?

In the same category: GitHub, Desktop Commander, Cloudflare MCP

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

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by github

GitHub’s official server lets AI read and manage code, issues and pull requests in your account. Use GitHub’s hosted version or run it locally with Docker.

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Desktop Commander

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MCP server for terminal commands, file operations, and process management

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Cloudflare MCP

by cloudflare

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Runs in the cloud★ 4,446Apache-2.0Updated 14 months ago

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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.

spawner-cli

The command line and MCP server of Spawner. Spawner is an open source, self-hosted preview environment manager: a copy of your app for each git branch, on your own server, with its own URLs, database and logs, for teams and their coding agents.

With spawner, developers and coding agents create, update and delete environments from a worktree, uncommitted changes included, run commands in them and read their logs.

Install

npm install -g spawner-cli

It needs Node.js 20 or later, and a Spawner server: install one with a single command. Every server also serves the CLI of its own version at /api/v1/cli/spawner.

Log in

spawner login https://spawner.preview.example.com

Type the code it shows in the dashboard and approve the login: the CLI stores a personal token. In CI or a container, SPAWNER_URL and SPAWNER_TOKEN replace the login.

Commands

# write .spawner/, and offer to add the instructions for coding agents

spawner init

the environment of the current branch, from this worktree

spawner up --wait

run a command in a service

spawner exec feat-login db -- psql -U app -c "select * from users"

only the error lines, stack traces kept whole

spawner logs feat-login api --errors

a link for someone without an account

spawner share feat-login

spawner down feat-login

Before the first spawner up of a project, an admin adds the project in the dashboard (Projects, New project). The other commands: status, ls, stats, capacity, url, shell, stop, start, sleep, wake, extend, token, whoami and logout.

Commands print JSON with --json and exit with stable codes: 4 when the environment failed, 6 when the quota or the server's capacity is reached, 7 when .spawner/ was refused.

MCP server

spawner mcp is an MCP server on stdio, with the login and the rights of the CLI. In Claude Code:

claude mcp add spawner -- spawner mcp

In a project's .mcp.json, or Cursor's .cursor/mcp.json:

"mcpServers": { "spawner": { "command": "spawner", "args": ["mcp"] } } }

It has nine tools: spawner_up, spawner_status, spawner_list, spawner_logs, spawner_exec, spawner_stats, spawner_url, spawner_share and spawner_down. spawner_exec and spawner_down are marked destructive: whether a client asks before running them depends on the client and its permission settings.

Documentation

The CLI and the MCP server: every command, JSON outputs, exit codes
Coding agents: Claude Code, Codex, Cursor, and the instructions spawner init adds
Quick start: from a fresh server to the first environment

Source: github.com/Flosk6/Spawner. License: Apache-2.0.

Spawner

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

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 Developer toolsi

Common questions

Alternatives

GitHub

Desktop Commander

Cloudflare MCP

README from the maker

spawner-cli

Install

Log in

Commands

the environment of the current branch, from this worktree

run a command in a service

only the error lines, stack traces kept whole

a link for someone without an account

MCP server

Documentation