Open-Source Agent Frameworks Standardize Around a Shared Tool-Calling Format

## Fragmentation Was Slowing Everyone Down Early agent frameworks each defined tools their own way, meaning a tool built for one framework typically had to be rewritten to work with another -- duplicated effort across a fast-moving ecosystem. ## The Convergence A shared, JSON-schema-based tool definition format is increasingly being adopted across frameworks, letting a tool built once be registered with multiple different agent runtimes with minimal adaptation. ## What This Unlocks As the format stabilizes, a growing ecosystem of shared, reusable tools is emerging -- reducing the amount of custom integration work needed every time a team adopts a new framework or switches between them.