Building AI Agents from scratch tutorial series updates Part 5: Multi-tool collaboration

On 2026-11-13 at 09:19, cnblogs published a report noting that the "Hand-Building an AI Agent" tutorial series has been updated to its fifth installment. The series is framed as a from-scratch build of a general-purpose tool-using Agent, with scope that includes conversation, tool calling, task planning, and multi-Agent collaboration, ultimately aiming to integrate into the MCP ecosystem. The technical stack is pinned to Node.js 22 + TypeScript, and the model access layer relies on an OpenAI-compatible integration.

The fifth post centers on a multi-tool collaboration approach that lets the Agent decide on its own the order in which it performs searches and reads results, while also supporting parallel web page fetching. Based on the available coverage, the series currently stands at the fifth entry, and no further installments have been reported yet. The walkthrough is presented as a practical, step-by-step build rather than a product release, with each part extending the Agent's capabilities before the planned MCP integration step.