--- title: "The Protocol That Cleaned Up Our Agent Architecture" url: https://daily.dev/posts/the-protocol-that-cleaned-up-our-agent-architecture-y1dso0vxj source_url: https://towardsdatascience.com/the-protocol-that-cleaned-up-our-agent-architecture type: article source: "Towards Data Science" published: 2026-06-15T15:18:19.426Z updated: 2026-07-09T02:14:02.569Z tags: ["agentic-ai", "langgraph", "mcp"] reading_time: 10 upvotes: 2 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # The Protocol That Cleaned Up Our Agent Architecture **[Towards Data Science](https://daily.dev/sources/tds)** · 10 min read · 2 upvotes · 0 comments ## Summary A practical account of migrating a multi-agent LangGraph system from scattered local tool definitions to a centralized MCP (Model Context Protocol) server. Covers building an MCP server with FastMCP, choosing between stdio and HTTP transports, integrating with LangGraph via langchain-mcp-adapters, moving human-in-the-loop approval logic to a single protocol boundary layer, and real production pitfalls like server crashes, wrong tool routing, and long-running approval gates. The migration eliminated tool duplication across seven agents and decoupled ML and application teams via a clean contract. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [One Year of MCP: Looking Back, and Forward](https://daily.dev/posts/one-year-of-mcp-looking-back-and-forward-ymkm9aqzq) · The New Stack · 1 upvotes · 0 comments - [How to Build a Multi-Agent AI System with LangGraph, MCP, and A2A \[Full Book\]](https://daily.dev/posts/how-to-build-a-multi-agent-ai-system-with-langgraph-mcp-and-a2a-full-book--qyzb80uxm) · freeCodeCamp · 3 upvotes · 0 comments --- Tags: [#agentic-ai](https://daily.dev/tags/agentic-ai), [#langgraph](https://daily.dev/tags/langgraph), [#mcp](https://daily.dev/tags/mcp) [View this post on daily.dev](https://daily.dev/posts/the-protocol-that-cleaned-up-our-agent-architecture-y1dso0vxj)