AI Coding Agent Security: Practical Guardrails for Claude Code, Copilot, and Codex

You gave your AI agent access to your codebase. Cool. Did you also give it access to ~/.aws/credentials, your SSH keys, and every token in your shell environment? Because you probably did — by accident. This is a quick practical guide on locking down the most popular AI coding tools so they can't read things they shouldn't. Copy-paste configs, no fluff. Why this is actually a problem AI agents aren't autocomplete. They read files, run shell commands, install packages, make netwo...