ModelFuzz: Open-Source Python Library Guards AI Agents Against Prompt Injection Attacks

·1 views

A developer has released ModelFuzz, an open-source Python library designed to prevent AI agents from leaking sensitive data through prompt injection attacks. Rather than filtering malicious prompts, ModelFuzz intercepts tool calls at the execution layer and checks their arguments for policy violations — such as stolen API keys or unsafe URLs — before allowing them to run. The library also includes a CLI scanner that simulates prompt injection attacks against local AI models to test their vulnerability. In testing against a local Qwen2.5:1.5b model, the scanner successfully breached the model four out of five times, highlighting the severity of the risk. ModelFuzz is freely available on PyPI and GitHub, with the developer seeking community input on additional security policies and framework support.

Read the full story at DEV Community

This is an AI-generated summary. ShortSingh links to the original source for the complete article.

Discussion (0)

How Dictionary delegates can replace if-else chains for cleaner C# code

A C# developer demonstrated how replacing repetitive if-statement blocks with a Dictionary delegate pattern leads to more maintainable and scalable code. The original approach used multiple if statements to return different Package objects based on coupon codes, which becomes unwieldy as the number of cases grows. Switching to a Dictionary with coupon codes as keys offers O(1) lookup time, making it significantly faster than searching through a list or array. The pattern was further extended to support delegate functions as dictionary values, allowing dynamic logic such as seasonal price adjustments to be handled cleanly. The technique highlights a practical way to improve code readability and performance in everyday C# development scenarios.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Solo dev launches free browser-based pixel-art editor Pixanima with AI animation tools

A solo developer has launched Pixanima, a browser-based pixel-art and animation editor built with Vue 3 and Laravel 12 that requires no installation and stores projects locally via IndexedDB. The editor offers layers, frame-timeline animation, onion-skinning, and export to GIF, sprite sheets, and PNG entirely on the client side, making it free to use permanently. An optional AI assistant powered by a backend pipeline converts text prompts into sprites, seamless tiles, and palettes, and can generate in-between animation frames using Google's FILM interpolation model. Because the core editor runs client-side and cannot be meaningfully paywalled, the developer chose to monetize only the AI features, which carry real server-side costs and are protected by backend logic. An atomic credit transaction system ensures users are never double-charged or billed for failed AI requests.

0 comments Read more at DEV Community

ProgrammingHacker News ·

Building on ATProto

Article URL: https://lukekanies.com/writing/building-on-atproto/ Comments URL: https://news.ycombinator.com/item?id=49025984 Points: 11 # Comments: 0

0 comments Read more at Hacker News

ProgrammingDEV Community ·

Developer builds open, multi-region AI API latency tracker covering 45 providers

A developer created LLM Latency Tracker after finding no independent, regionally diverse benchmarks for hosted AI API performance. The tool uses a lightweight Python prober to measure network-level latency and time-to-first-token across four global regions: Germany, US Central, Tokyo, and São Paulo. It covers roughly 45 providers, including major Western labs and several Chinese models rarely featured in Western benchmarks. Results are stored in a SQLite time-series database and published as a static site on Cloudflare Pages, with automatic scheduled updates and no persistent backend. The project is freely available under CC-BY-4.0 and includes a JSON API and an MCP server to make latency data accessible to AI agents and automated tools.

0 comments Read more at DEV Community