Add AI extension by KimosFrontender

[kms413]

Statement on AI Use

The code in this extension was partially drafted with the help of AI (DeepSeek) to accelerate development. All AI-generated portions have been thoroughly reviewed, tested, and fixed by human developers. I take full responsibility for the final code, which has been validated through multiple rounds of testing to ensure correctness, security, and compliance with the specification.

Description

Add a new AI extension that allows Scratch projects to chat with AI models using OpenAI-compatible and Anthropic-compatible APIs, with full streaming response support.

Extension Details

• Name: AI
• ID: ai
• Slug: KimosFrontender/ai
• Author: KimosFrontender
• License: MIT

Features

• Chat with AI models — Send messages and receive streaming responses in real-time
• Multi-provider support — Works with both OpenAI-compatible and Anthropic-compatible API formats
• 20+ built-in provider URLs — Pre-configured URLs for OpenAI, DeepSeek, Qwen, Kimi, GLM, Doubao, Gemini, Groq, Mistral, OpenRouter, and many more
• Multi-chat management — Create and manage multiple independent chat sessions
• AI presets — Define reusable configurations (API key, model, request URL, format) and assign them to chats
• Data processing blocks — JSON manipulation utilities including object merging, array indexing, and property access
• Stop generation — Abort in-progress streaming responses
• Chat history editing — Programmatically read, write, and modify conversation histories

Blocks Overview

Category	Examples
Chat Management	Create/delete chats, assign AI presets, check status
AI Presets	Create presets, set API key / model / URL / format
Common AI URLs	Built-in reporter blocks for 20+ provider endpoints
Streaming	Send message, stop message, get response, check idle
Data Processing	JSON object/array manipulation, chat history editing

Files Included

File	Purpose
extensions/KimosFrontender/ai.js	Extension source code
images/KimosFrontender/ai.svg	Extension cover image (600×300, 2:1 ratio)
samples/Ai.sb3	Sample project demonstrating the extension

Checklist

• Extension code follows the gallery guidelines
• Metadata comments are present
• SPDX license identifier is valid (MIT)
• Cover image has correct 2:1 aspect ratio
• Extension added to extensions/extensions.json
• Sample project references the correct extension URL
• I have read the contribution guidelines

Notes

• The extension uses the Scratch.fetch() API for making HTTP requests
• Streaming responses use SSE (Server-Sent Events) parsing for both OpenAI and Anthropic formats
• API keys are stored in AI presets and passed via request headers (Authorization: Bearer for OpenAI, x-api-key for Anthropic)

[kms413]

!format

[Brackets-Coder]

This can't me merged in accordance with the contributing guidlines. It relies on user-generated API keys stored in the project which is a major security concern and would allow anyone to retrieve the API key and bill the creator's credit card. Additionally, it also seems to rely on numerous third-parties, which may or may not be available depending on the internet connection or network configuration

Honestly, the only way I could see an AI chatbot actually being merged is if it runs offline, locally on the machine (no API key) via WebGPU, such as the following: https://huggingface.co/spaces/webml-community/gemma-4-webgpu-kernels