World ID — Integration Guide

What it does

This skill guides developers through integrating World ID (IDKit) into new or existing applications. It walks an agent or developer through the full integration lifecycle: setting up the Developer Portal MCP, choosing credential presets, creating app/RP configuration, signing requests server-side, opening the IDKit widget client-side, verifying proofs, and storing nullifiers to prevent replay. The guide emphasises security best-practices and environment matching.

When to use it

Use when a user asks to "add World ID", "verify real humans", "proof of human", "guard against bots", or when integrating IDKit across React/Next.js, mobile (Swift/Kotlin), or backend stacks (Node/Go). It's suitable for both new projects and retrofits.

What's included

• Scripts: none bundled (has_scripts=false).
• References: links to official integration docs, signature spec, error codes, and Developer Portal MCP examples (has_references=false in repo but external references provided in-body).
• Instructions: step-by-step integration checklist (6 steps), credential presets, environment debugging traps, and a hand-off checklist to ensure keys and nullifiers are handled safely.

Compatible agents

Best used by code-capable assistants (Claude Code, Copilot-family agents) and developer-facing helpers that can present checklists and code snippets. The skill is structured to be pasted into an agent for guided, scaffolded integration.