Claude Code's Workflow tool (research preview version) allows developers to orchestrate collaboration among multiple agents using JavaScript scripts, instead of relying on a single long conversation to complete all tasks. This architecture delegates control flows like loops, conditional judgments, and parallel execution to deterministic code—only the agent() calls at leaf nodes require real intelligent reasoning, and each agent runs in its own independent context.
However, the Workflow tool itself only provides a basic platform. Developers need to implement a large number of repetitive mechanisms on their own: result validation after parallel execution, reasonable stop conditions, schema definition for result data, honest records of omissions or truncations, etc. Manually implementing these mechanisms easily leads to errors in the same subtle details, and a failed agent midway is almost indistinguishable from a successfully completed one.
Workflow Toolbox is a systematic toolkit designed to address these pain points, analogizing the process of building multi-agent workflows to assembling Lego bricks.