SIGTREX API is an AI execution control layer for developers using ChatGPT, Claude, Cursor, Windsurf, Copilot, and AI agents. SIGTREX detects drift, blocks risky multi-step scope creep, generates safer prompts, creates execution contracts, verifies output before changes are applied, and creates replay traces. Example: Request: “Fix auth, redesign dashboard, and update billing” SIGTREX: 🚫 BLOCKED — multi_step_drift AI should follow scope — not quietly expand it.