The hidden cost of AI dev tools isn't the price tag—it's the stack you never decided on. When technical leaders face AI dev-tool budgets in 2026, they're not just buying software. They're inheriting an operating-model problem that compounds faster than seat costs. This article reveals where budget actually disappears and how to reclaim it through deliberate stack architecture. TL;DR: AI dev-tool spend leaks through overlap, not just high prices. Learn where budget actually disappears in 2026 and how technical leaders can stop it. Most teams think AI dev-tool spend leaks because the tools are expensive. That is only part of the story. The bigger leak is structural. The money rarely disappears in one dramatic purchase. It leaks through duplication: two tools solving the same workflow, premium seats assigned "just in case," background-agent usage nobody governs, and a growing context layer that expands faster than the team's standards.…