‘TrustFall’ convention exposes Claude code execution risk

Developers using the latest versions of AI coding tools like Claude Code, Cursor CLI, Gemini CLI, and CoPilot CLI could inadvertently execute malicious code on their systems with a single keypress, or no keypress at all in continuous integration environments.

That, according to researchers at Adversa AI, is because none adequately warn users of how a malicious repo can auto-approve and spawn a Model Context Protocol (MCP) server without their explicit approval or knowledge. All four coding tools show some form of a trust dialog prompting the user to indicate whether they trust a particular repo, but they do not offer full details on what that consent might actually entail.

Adversa AI identified Claude Code as offering the least information in its trust dialog, and Gemini AI as offering the most, along with a choice in terms of allowing or disallowing an MCP server to execute on the developer’s system. But the exposure is the same in all four, according to Adversa’s lead researcher, Rony Utevsky.

Read more at Dark Reading