# The Tool System Is The Product

By Rajdeep Mondal. Published 2026-04-24. 7 min read

Canonical: https://www.rajdeepmondal.com/writing/the-tool-system-is-the-product

Tags: Agents, Claude Code, AI Systems

> A tool is a contract the runtime checks before anything runs. The contract fixes the input, the safety, the rule that decides, and the shape of the result. It fixes what later calls can count on. The order of those checks is the product.

Read the interactive essay: https://www.rajdeepmondal.com/writing/the-tool-system-is-the-product