How to Use the Exact Online Bouw MCP in Mastra AI

Q: How does the workflow engine handle complex WBS structures?

Your workflow can call listprojectwbs to fetch the entire structure as JSON. Mastra AI processes this nested data to find the correct node before executing subsequent cost or time writes.

Automate Dutch construction workflows with Mastra AI and the Exact Online Bouw MCP server to stop budget overruns.

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Connect Exact Online Bouw MCP to Mastra AI

Create your Vinkius account to connect Exact Online Bouw to Mastra AI and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Exact Online Bouw with Mastra AI

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Automate cost routing with Mastra AI workflows

The `create_cost_transaction` tool hooks into Mastra AI workflow steps to automatically log expenses and route them for approval. If an incoming invoice exceeds the remaining balance, the workflow triggers a conditional branch to alert the finance team instead of silently failing. This automated handling prevents manual ledger entry errors on busy construction sites. You write the logic once in TypeScript, and Mastra handles the retries and step execution.

Sync WBS nodes with this MCP Server

The `list_project_wbs` tool exposes your project's Work Breakdown Structure so Mastra agents can map incoming subcontractor invoices to the correct task codes. The framework's built-in workflow engine retries the sync if the connection drops, ensuring no transaction is left hanging. This automated structure mapping keeps your Dutch G-account calculations accurate. Your agents read the WBS tree, validate the task, and write the transaction without human intervention.

Trigger automatic labor hour reconciliation

The `create_time_transaction` tool allows Mastra agents to reconcile weekly timesheets against active project budgets. When a worker submits hours, the agent checks `list_project_hour_budgets` and automatically writes the approved hours to the ledger. If the hours exceed the budget, Mastra triggers an escalation workflow to the project manager. This keeps your labor costs aligned with actual site progress.

Setup guide

Set up Exact Online Bouw MCP in Mastra AI

Prerequisites

Node.js 18+ and a TypeScript project
@mastra/mcp + @mastra/core packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run npm install @mastra/mcp @mastra/core plus your preferred model provider (e.g. @ai-sdk/openai).
2

Configure the MCPClient
Create an MCPClient with your Vinkius endpoint as a URL object. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Discover and inject tools
Call mcpClient.listTools() and spread the result into your agent's tools object. All Exact Online Bouw tools become native Mastra tools.
4

Run with any model
Swap openai("gpt-4o") for any AI SDK-compatible provider. Call agent.generate() and the agent routes tool calls through MCP automatically.

agent.ts

import { MCPClient } from "@mastra/mcp";
import { Agent } from "@mastra/core/agent";
import { openai } from "@ai-sdk/openai";

const mcpClient = new MCPClient({
  id: "exact-online-bouw-mcp-client",
  servers: {
    "exact-online-bouw-mcp": {
      url: new URL(
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
      ),
    },
  },
});

const agent = new Agent({
  name: "Exact Online Bouw Agent",
  model: openai("gpt-4o"),
  instructions: "You have access to Exact Online Bouw tools.",
  tools: {
    ...(await mcpClient.listTools()),
  },
});

const result = await agent.generate(
  "List recent Exact Online Bouw transactions"
);
console.log(result.text);

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Common questions about Exact Online Bouw MCP in Mastra AI

Configure automatic retries with exponential backoff on your workflow steps. If `create_cost_transaction` fails due to a rate limit, the Mastra AI engine pauses and retries the write without losing the transaction state.

Yes. You can use Mastra AI's human-in-the-loop feature to pause the workflow before running `create_time_transaction`. The agent waits for a supervisor's sign-off before committing the hours to your Exact Online Bouw ledger.

Initialize the client using the Vinkius endpoint, then call `mcpClient.listTools()`. You can spread these tools directly into your agent's configuration, making the entire suite of construction management endpoints available instantly.

Your workflow can call `list_project_wbs` to fetch the entire structure as JSON. Mastra AI processes this nested data to find the correct node before executing subsequent cost or time writes.

Your employee records and division IDs are processed in memory and never persisted. The MCP server runs in a zero-trust, ephemeral sandbox on Vinkius, ensuring your Dutch payroll and labor rates remain private.

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