SecondThought: Command Confirmation Guard

One accidental press of Enter can clear an inventory, stop a server, change operators, or run the wrong command against the wrong target. SecondThought adds a configurable confirmation step before manually typed commands leave your client.

When protection applies, the first submission is blocked. Enter the exact same full command again within the confirmation window to send it. Different arguments, an expired confirmation, or an intervening direct command will not reuse the pending confirmation.

Why use SecondThought?

• Helps prevent accidental /clear, /kill, /stop, /ban, /op, and similar command mistakes
• Works on multiplayer servers with no server-side installation
• Supports allow-list and protect-list workflows
• Can require confirmation for every command or disable confirmation entirely
• Changes modes immediately through local /secondthought commands
• Keeps command arguments out of its warning message
• Has no Fabric API requirement, telemetry, account, or external service

Four configurable modes

All direct
Every command is sent immediately.

Listed direct
Only command roots in directCommands are sent immediately. Everything else requires an exact second submission.

None direct
Every manually typed command requires confirmation.

Listed protected
Only command roots in protectedCommands require confirmation. This is the default mode.

Local commands

/secondthought mode all
/secondthought mode listed
/secondthought mode none
/secondthought mode protected
/secondthought status
/secondthought help

The commands above are intercepted locally, never sent to the server, and a successful mode change is saved automatically.

Configuration

Start Minecraft once to create:

config/secondthought.json

The default protected roots are:

ban, ban-ip, clear, deop, kill, op, stop, whitelist, worldborder

The JSON file controls the confirmation window, protected list, direct list, and startup mode. Command-list or timer edits require a client restart; mode changes made through /secondthought mode do not.

Installation and requirements

1. Install Fabric Loader for Minecraft Java Edition 1.21.11.
2. Place the SecondThought JAR in the client's mods folder.
3. Start Minecraft. The server does not need SecondThought.

Requires Java 21. Fabric API is not required.

Important scope

SecondThought is a local mistake-prevention utility, not a permission or security system. It cannot undo executed commands and does not cover clickable command components or commands sent unattended by another mod in version 0.1.0.

SecondThought: Command Confirmation Guard

Prevent an accidental /clear, /kill, /stop, /ban, or other command from being sent with a single press of Enter.

SecondThought is a lightweight client-side command confirmation mod. When a command requires confirmation, its first submission is blocked locally. Send the exact same command again within the configured time window to confirm it.

It works in singleplayer and on multiplayer servers without requiring the server to install the mod.

Features

• Protect manually typed commands before they reach the server
• Require the exact same command and arguments for confirmation
• Choose which commands are direct and which require confirmation
• Change the active mode instantly with a local in-game command
• Save mode changes automatically to the JSON configuration
• Show only the command root in warnings, not potentially sensitive arguments
• Fall back to safe defaults if the configuration is invalid
• No telemetry, network service, Fabric API, or server-side dependency

Command modes

Change modes without restarting:

/secondthought mode all
/secondthought mode listed
/secondthought mode none
/secondthought mode protected
/secondthought status
/secondthought help

These control commands are handled locally and are never sent to the server.

Default protection

The default configuration protects these command roots:

ban, ban-ip, clear, deop, kill, op, stop, whitelist, worldborder

Edit config/secondthought.json to change the protected or direct command lists and the confirmation window. Existing configuration files from earlier 0.1.0 test builds remain compatible.

Requirements

• Minecraft Java Edition 1.21.11
• Fabric Loader 0.19.3 or a compatible later 0.19.x release
• Java 21
• Client-side installation only

Fabric API is not required.

Scope and compatibility

SecondThought guards normal commands manually submitted through the Minecraft client. It does not grant permissions, replace a server permission plugin, classify every modded command automatically, or undo a command that has already run. Commands triggered by clickable text or sent unattended by another mod are outside version 0.1.0's scope.