Introduction: The Double-Edged Sword of Claude Code ModsAnthropic’s Claude Code Mods are a developer’s dream—JavaScript ...

Introduction: The Double-Edged Sword of Claude Code ModsAnthropic’s Claude Code Mods are a developer’s dream—JavaScript or TypeScript functions that hook into the AI coding tool’s core events, allowing users to customize everything from tool calls to UI rendering. Built-in features like /diff are already powered by Mods, and Anthropic provides samples on GitHub, showcasing their potential. However, this flexibility comes with a critical trade-off: Mods run with full user permissions and are not sandboxed. This design choice, while enabling deep extensibility, exposes users to significant security risks if Mods are installed from untrusted sources.Here’s how the risk materializes: When a Mod is executed, it operates within the same permission scope as the user, meaning it can access sensitive data, modify system behavior, or even execute arbitrary code. Without sandboxing—a mechanism that isolates code execution to prevent unintended or malicious actions—a compromised Mod becomes a dire...