Does Claude Code Expose Your Code?

Yes — Claude Code sends your code to Anthropic's servers for processing. Files that Claude Code reads are transmitted in their entirety to Anthropic's cloud infrastructure for analysis. Your prompts, responses, and conversation context are also processed on Anthropic's servers. However, only files you explicitly have Claude Code read are sent — the rest of your project stays local. The critical risk is sensitive data like API keys in .env files, which Claude Code automatically loads without notifying you.

Context

Claude Code operates as a client that communicates with Anthropic's cloud services — it doesn't run locally on your machine. This means any code analysis requires transmission to Anthropic's servers. The architecture is transparent: file names, directory structures, and project organization details are included to give Claude better context about your codebase. Only files explicitly read are sent; databases, external APIs, and other running applications stay local unless you share them directly.

The larger security concern emerged in March 2026 when developer Dor Munis discovered that Claude Code automatically loads .env, .env.local, and similar environment files without user notification. These files typically contain API keys, proxy credentials, database passwords, and other sensitive secrets — precisely what developers exclude from version control. Once loaded, these secrets are accessible in memory. If Claude Code is breached or misused, or if sensitive operations inadvertently expose them, your credentials are at risk.

Anthropic maintains a 30-day retention policy for deleted conversations, meaning removed chat histories remain on their servers for up to 30 days unless flagged as suspicious. This applies even after you delete a conversation.

Practical Steps

1. Never include .env files in Claude Code interactions — move sensitive credential files outside your project directory or create a separate workspace without them
2. Review all file paths before approving — Claude Code requests permission to read files; verify you're not accidentally sharing sensitive data
3. Use environment variable references instead of secrets — avoid pasting API keys directly; instead, reference variables in documentation or examples
4. Delete sensitive conversations immediately — when done with a conversation containing code, delete it to start the 30-day retention clock
5. Assume everything you share is transmitted — any file Claude Code reads is sent to Anthropic's servers; default to conservative file sharing
6. Configure permissions strictly — use Claude Code's permission system to restrict what it can read and execute; don't auto-approve all commands

Related Questions

• What is the difference between Claude Code and Cursor?
• Is Claude Code free to use?
• How do I set up Claude Code remote control on my phone?

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