How do I find my Holded API Key?

Log in to your Holded account, click on the **Settings** icon (top right), go to **Developers**, and you will find your unique **API Key** listed there. You can create multiple keys for different integrations.

What document types are supported in the invoicing tools?

This integration currently focuses on the `invoice` document type. For other types like sales orders or purchase orders, you can use the generic `list_invoices` logic if they are mapped under the same module in your instance.

Can I update stock levels through this integration?

Yes! Use the `update_product_stock` tool. You must provide the product ID and a JSON string containing the warehouse ID and the new quantity to update your inventory.

Is the integration secure for ERP data?

Absolutely. The integration uses official Holded API keys in the request header over HTTPS. Your credentials and business data are encrypted and stored securely within the Vinkius Cloud infrastructure.

Holded MCP Server for Google ADK 11 tools — connect in under 2 minutes

Name: Holded
Availability: InStock
Author: Vinkius

google.github.io/adk-docs/tools/mcp-tools

Built by Vinkius GDPR 11 Tools SDK

Google Agent Development Kit (ADK) is Google's framework for building production AI agents. Add Holded as an MCP tool provider through Vinkius and your ADK agents can call every tool with full schema introspection.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

python

from google.adk.agents import Agent
from google.adk.tools.mcp_tool import McpToolset
from google.adk.tools.mcp_tool.mcp_session_manager import (
    StreamableHTTPConnectionParams,
)

# Your Vinkius token. get it at cloud.vinkius.com
mcp_tools = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    )
)

agent = Agent(
    model="gemini-2.5-pro",
    name="holded_agent",
    instruction=(
        "You help users interact with Holded "
        "using 11 available tools."
    ),
    tools=[mcp_tools],
)

Fully ManagedVinkius Servers

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High SecurityEnterprise-grade

IAMAccess control

EU AI ActCompliant

DLPData protection

V8 IsolateSandboxed

Ed25519Audit chain

<40msKill switch

Stream every event to Splunk, Datadog, or your own webhook in real-time

* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About Holded MCP Server

Connect your Holded ERP platform to any AI agent and take full control of your invoicing, CRM, and project management through natural conversation.

Google ADK natively supports Holded as an MCP tool provider. declare Vinkius Edge URL and the framework handles discovery, validation, and execution automatically. Combine 11 tools with Gemini's long-context reasoning for complex multi-tool workflows, with production-ready session management and evaluation built in.

What you can do

Invoicing Oversight — List all documents, retrieve detailed invoice data, and monitor payment statuses efficiently.
CRM & Contact Management — Access lists of clients, suppliers, and leads, and retrieve full profile information for better relationship management.
Project & Task Tracking — List active projects and monitor tasks across your entire portfolio to ensure deadlines are met.
Inventory & Products — Access your product catalog and update stock levels directly from the chat interface.
Business Intelligence — Retrieve account and organization metadata to maintain a high-level overview of your business operations.
Unified ERP — Bridge the gap between your accounting and operations using the comprehensive Holded API.

The Holded MCP Server exposes 11 tools through the Vinkius. Connect it to Google ADK in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect Holded to Google ADK via MCP

Follow these steps to integrate the Holded MCP Server with Google ADK.

Install Google ADK

Run pip install google-adk

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token

Create the agent

Save the code above and integrate into your ADK workflow

Explore tools

The agent will discover 11 tools from Holded via MCP

Why Use Google ADK with the Holded MCP Server

Google ADK provides unique advantages when paired with Holded through the Model Context Protocol.

Google ADK natively supports MCP tool servers. declare a tool provider and the framework handles discovery, validation, and execution

Built on Gemini models, ADK provides long-context reasoning ideal for complex multi-tool workflows with Holded

Production-ready features like session management, evaluation, and deployment come built-in. not bolted on

Seamless integration with Google Cloud services means you can combine Holded tools with BigQuery, Vertex AI, and Cloud Functions

Holded + Google ADK Use Cases

Practical scenarios where Google ADK combined with the Holded MCP Server delivers measurable value.

Enterprise data agents: ADK agents query Holded and cross-reference results with internal databases for comprehensive analysis

Multi-modal workflows: combine Holded tool responses with Gemini's vision and language capabilities in a single agent

Automated compliance checks: schedule ADK agents to query Holded regularly and flag policy violations or configuration drift

Internal tool platforms: build self-service agent platforms where teams connect their own MCP servers including Holded

Holded MCP Tools for Google ADK (11)

These 11 tools become available when you connect Holded to Google ADK via MCP:

get_api_profile

Retrieve information about the authenticated account

get_contact_details

Get detailed profile information for a specific contact

get_invoice_details

Get detailed information about a specific invoice

get_product_details

Get detailed information for a specific product

get_project_details

Get detailed configuration and status for a project

list_all_tasks

List tasks across all projects

list_contacts

Useful for finding the contact ID required for documents. List all contacts (clients, suppliers, leads) in Holded

list_invoices

Use this to monitor billing and find IDs for specific document actions. List all invoices in your Holded account

list_products

List all products and services in your Holded inventory

list_projects

List all active and past projects

update_product_stock

Pass details as a JSON string in "body_json" (requires warehouseId and new quantity). Update the stock level for a specific product

Example Prompts for Holded in Google ADK

Ready-to-use prompts you can give your Google ADK agent to start working with Holded immediately.

"List all active projects and show the last task for each."

"Find contact 'Acme Corp' and show their recent invoices."

"Show me the details for product ID 'prod_992' and its stock level."

Troubleshooting Holded MCP Server with Google ADK

Common issues when connecting Holded to Google ADK through the Vinkius, and how to resolve them.

McpToolset not found

Update: pip install --upgrade google-adk

Holded + Google ADK FAQ

Common questions about integrating Holded MCP Server with Google ADK.

How does Google ADK connect to MCP servers?

Import the MCP toolset class and pass the server URL. ADK discovers and registers all tools automatically, making them available to your agent's tool-use loop.

Can ADK agents use multiple MCP servers?

Yes. Declare multiple MCP tool providers in your agent configuration. ADK merges all tool schemas and the agent can call tools from any server in a single turn.

Which Gemini models work best with MCP tools?

Gemini 2.0 Flash and Pro models both support function calling required for MCP tools. Flash is recommended for latency-sensitive use cases, Pro for complex reasoning.