Your AI Agent Trusts Every Tool It's Ever Been Introduced To; That's the Whole Problem

Why the MCP security crisis of 2026 isn’t a patching problem — and the provenance-tracking architecture I built to actually close the gap. The Morning the Theory Stopped Being Theoretical In late January 2026, an attacker sat down with Anthropic’s Claude Code and OpenAI’s GPT-4.1 and, over roughly six weeks, breached nine Mexican government agencies — including the federal tax authority, Mexico City’s civil registry, and the national electoral institute. By the time the campaign was disrupted, the numbers looked like this: 195 million taxpayer records, 220 million civil records, more than 150G