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fvtt-sockets

Standardize socket-based communication and GM-delegated operations in Foundry VTT modules.

1|Updated Jan 4, 2026
Search Tags:#module development#multiplayer#socket#Foundry VTT#socketlib#GM delegation#event broadcasting
One-click install
npx skills add https://github.com/ImproperSubset/hh-agentics --skill fvtt-sockets
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: fvtt-sockets
Source: https://github.com/ImproperSubset/hh-agentics/tree/main/fvtt-dev/skills/fvtt-sockets
Command: npx skills add https://github.com/ImproperSubset/hh-agentics --skill fvtt-sockets

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill provides proven socket-based patterns to synchronize actions and state across players in Foundry VTT modules, enabling reliable multiplayer experiences.

Core Features & Use Cases

  • Standardized namespaces (module.system) for events and messages
  • Self-invoking emission pattern to avoid duplicate handling across clients
  • GM-delegated operations via ExecuteAsGM and optional socketlib support
  • Use cases: broadcast animations, synchronized state, and cross-client gameplay events

Quick Start

Create a basic module with the namespace module.my-module, register a listener on init, and broadcast a sample event to all other clients using game.socket.emit.

Frequently Asked Questions about fvtt-sockets

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I synchronize state and broadcast events across all clients in Foundry VTT?▼

To synchronize state in Foundry VTT, you can use standardized socket-based communication patterns like game.socket.emit to broadcast events and messages to all connected clients reliably.

How do I prevent duplicate event execution when broadcasting socket events to players?▼

To prevent duplicate event execution in Foundry VTT, apply a self-invoking emission pattern within your socket communication to ensure clients handle messages only once without redundant processing.

What is the best way to handle GM-delegated operations in a Foundry VTT module?▼

The best way to handle GM-delegated operations is using the ExecuteAsGM pattern for socket communication, which routes specific tasks to the active GM and prevents unauthorized client-side execution.

Does socketlib work with Foundry VTT sockets for advanced return values and multi-GM setups?▼

Yes, socketlib integrates with Foundry VTT socket patterns to support advanced return values and manage multi-GM setups, providing an alternative to native game.socket.emit for complex module workflows.

When should I register socket listeners for Foundry VTT module development?▼

You should register socket listeners at init-time during module setup in Foundry VTT, ensuring all event broadcasting and cross-client gameplay events are ready before players connect.

How do I structure namespaces for Foundry VTT socket events?▼

To structure namespaces for Foundry VTT socket events, use standardized conventions like module.system to organize event broadcasting and prevent message collisions between different modules and systems.

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