【Trending Overseas】 Blueprint MCP lets you understand codebases and system architecture by turning them into diagrams.

What it can do: ・Reads your codebase and generates architecture diagrams ・Creates sequence diagrams for OAuth login and other flows ・Visualizes ETL and payment processing flows ・Can diagram data from Google Drive and HubSpot

Solves the “I can’t see the big picture of this code” problem with diagrams. Perfect for anyone who wants to speed up architecture understanding and documentation creation.

ArcadeAI/blueprint-mcp

Source: https://github.com/ArcadeAI/blueprint-mcp

Blueprint MCP

Blueprint MCP

Image generated using Blueprint MCP, Nano Banana Pro, and Arcade MCP server.

Diagram generation for understanding codebases and system architecture using Nano Banana Pro.

Works with Arcade’s ecosystem: Combine with HubSpot, Google Drive, GitHub, and other Arcade tools to extract data from your systems and visualize it as diagrams.

Setup

1. Sign up for Arcade

https://arcade.dev

2. Install Dependencies

``bash

Create virtual environment

python3 -m venv venv source venv/bin/activate # On Windows: venv\Scripts\activate

Install Arcade CLI

pip install arcade-mcp ``

3. Login to Arcade

bash arcade-mcp login

4. Get Google AI Studio API Key

https://aistudio.google.com/ → Create API key

5. Store Secret in Arcade

bash arcade-mcp secret set GOOGLE_API_KEY="your_api_key_here"

6. Deploy Server

Clone this repo, then:

bash cd blueprint-mcp arcade-mcp deploy

7. Create Gateway

1. Go to https://api.arcade.dev/dashboard
2. Click “Gateways” → “Create Gateway”
3. Add your deployed architect_mcp server to the gateway

8. Configure Cursor

1. In Cursor: Settings → MCP
2. Add your Arcade gateway URL
3. Restart Cursor

Usage

Tools

• start_diagram_job - Start generation, returns job ID
• check_job_status - Check if complete
• download_diagram - Download PNG as base64

Example Prompts

Visualize code architecture: Analyze the authentication module in src/auth/ and create an architecture diagram showing the components and their relationships.

Document API flows: Create a sequence diagram showing the OAuth login flow based on the code in src/auth/oauth.py

Explain processes: Generate a flowchart explaining how our payment processing works, showing the steps from checkout to confirmation.

Understand data pipelines: Create a data flow diagram for our ETL pipeline showing sources, transformations, and destinations based on the data/ directory.

Combine with other Arcade tools: Pull the latest deal from HubSpot for "Acme Corp" and create an architecture diagram of the proposed solution.

Read the system design doc from Google Drive and generate a visual architecture diagram from it.

How It Works

1. start_diagram_job → Returns job ID instantly
2. Wait 30 seconds (Nano Banana Pro generates)
3. check_job_status → Check if “Complete”
4. download_diagram → Get base64 PNG
5. Agent decodes and saves to workspace

Example Diagrams

Enterprise Architecture - Banking Use Case

Cursor Prompt: `` Can you understand Arcade deeply and create an architecture diagram for someone who’s new and wants to understand Arcade in the broader AI, LLM, and agent landscape? I want this architecture to fit into a realistic enterprise scenario like a bank, showcasing how Arcade MCP Runtime fits into their broader architecture.

https://docs.arcade.dev/llms.txt ``

Prompt received by Blueprint MCP tool: “Create enterprise architecture diagram with 5 layers: LAYER 1 End Users (Customer Service Agents, Loan Officers, Compliance Team, IT Ops), LAYER 2 Banking AI Assistant (Cursor IDE / Custom UI), LAYER 3 AI Layer showing GPT-4/Claude and LangChain/CrewAI (Model-Agnostic), LAYER 4 Arcade MCP Runtime (large box) containing Runtime Components (MCP Gateway, Tool Registry, OAuth 2.0 Auth, Secret Management, Session Manager) AND Hosted MCP Servers section with 6 MCP servers (Salesforce, Email/Gmail, Slack, Database, Document, Custom Banking) ALL INSIDE the Arcade box, LAYER 5 Bank’s Existing Infrastructure (Core Banking System, CRM Salesforce, Compliance Database, Document Repository, Communication Systems, Legacy APIs). Show data flow arrows with labels (Tool Calls, Authenticated Requests, API Calls). Use technical whiteboard style, muted colors (gray, light blue, purple, orange), monospace fonts, 16:9.”

Enterprise Banking Architecture

LangGraph Architecture Learning Card

Cursor Prompt: `` Help me understand the LangGraph architecture better. I have checked out the LangGraph codebase here:

/Users/guru/dev/nano/langgraph

Can you do a thorough analysis and help me understand the architecture? I would love to know details in a visual image: The key components involved, the flows, and can you create like one fully visual learning card sort of thing that helps me understand the architecture which I can print and give it to my fellow architects and help them learn? ``

Prompt received by Blueprint MCP tool: “Create LangGraph architecture learning card with 6 sections: Core Components (State, Nodes, Edges with flow diagram), StateGraph Class workflow (Define → Build → Compile → Execute), Pregel-Inspired Execution showing super-steps with parallel/sequential execution examples, Checkpointing System (BaseCheckpointSaver, checkpoint-postgres/sqlite, state snapshots flow), Monorepo Structure (langgraph core, prebuilt, checkpoint libs, cli, sdk-py, sdk-js), and Capabilities (Durable execution, Human-in-the-loop, Memory, Streaming, Multi-agent, Sub-graphs). Use technical whiteboard style, muted colors (blue, gray, purple, green, orange), monospace fonts for code terms, information-dense layout, 16:9, printable quality.”

LangGraph Architecture