Claude Code source map leaks are a wake-up call — here's how to monitor agent vulnerabilities

Last week, a team shipped a perfectly normal frontend build to staging. A few hours later, someone noticed the bundle was also serving *.map files. Not just harmless debug metadata — the source maps exposed internal file paths, comments, API call structure, and enough implementation detail to help an attacker understand how their AI coding agent was wired into the repo. That’s the part people keep missing about agent security: the leak usually isn’t the dramatic exploit. It’s the tiny bit of extra context that turns a prompt injection, secret scrape, or over-permissioned tool into a real incident. If you’re using Claude Code, Cursor, Copilot, Devin, or any agent that touches your codebase, source map leaks are worth treating as an agent vulnerability amplifier. Why this matters more for AI agents A source map leak by itself is already bad. It can reveal: internal module names hidden routes comments and TODOs feature flags error handling paths references to secrets systems or MCP tools