This article was originally published on LucidShark Blog .

CLAUDE.md Is a Security Boundary: The Attack Surface No One Is Auditing

May 12, 2026 10 min read Security

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The Config File Your AI Agent Trusts Completely

Every Claude Code session starts the same way. The agent reads CLAUDE.md , loads workspace settings, and builds its operating context from those files. It does not question them. It does not compare them to a previous known-good state. It just loads and trusts.

That trust is intentional and generally useful. CLAUDE.md is how you give Claude Code persistent instructions: coding standards, project conventions, tools to prefer, patterns to avoid.…