How to integrate Workday MCP with Google ADK

This guide walks you through connecting Workday to Google ADK using the Composio tool router. By the end, you'll have a working Workday agent that can request vacation days for next week, check your current absence balance, find all open job postings i manage through natural language commands. This guide will help you understand how to give your Google ADK agent real control over a Workday account through Composio's Workday MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Workday

Oauth2

Workday is a cloud-based ERP platform for HR, finance, and workforce analytics. It streamlines employee management, payroll, and business operations in a single system.

84 Tools13 Triggers

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Introduction

This guide will help you understand how to give your Google ADK agent real control over a Workday account through Composio's Workday MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Workday with

ChatGPT OpenAI Agents SDK Claude Agent SDK Claude Code Claude Cowork Codex OpenCode Cursor VS Code OpenClaw Hermes CLI LangChain Vercel AI SDK Mastra AI LlamaIndex CrewAI

TL;DR

Here's what you'll learn:

Get a Workday account set up and connected to Composio
Install the Google ADK and Composio packages
Create a Composio Tool Router session for Workday
Build an agent that connects to Workday through MCP
Interact with Workday using natural language

What is Google ADK?

Google ADK (Agents Development Kit) is Google's framework for building AI agents powered by Gemini models. It provides tools for creating agents that can use external services through the Model Context Protocol.

Key features include:

Gemini Integration: Native support for Google's Gemini models
MCP Toolset: Built-in support for Model Context Protocol tools
Streamable HTTP: Connect to external services through streamable HTTP
CLI and Web UI: Run agents via command line or web interface

What is the Workday MCP server, and what's possible with it?

The Workday MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Workday account. It provides structured and secure access to your HR, payroll, and recruiting data, so your agent can perform actions like managing time off, retrieving employee details, tracking job postings, and analyzing interview feedback on your behalf.

Automated time off management: Easily create new time off requests or check absence balances for yourself or others, making leave management effortless.
Employee data and profile retrieval: Have your agent fetch profile details for the current user or any specified worker to simplify onboarding and HR processes.
Comprehensive job posting insights: Instantly retrieve information about job postings, including descriptions and screening questionnaires, to aid recruiters and hiring managers.
Interview feedback analysis: Let your agent pull and summarize interview feedback entries to streamline debriefs and improve hiring decisions.
Access to holiday and leave events: Quickly get holiday schedules and leave status values for better workforce planning and scheduling.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step09 STEPS

Prerequisites

Before starting, make sure you have:

A Google API key for Gemini models
A Composio account and API key
Python 3.9 or later installed
Basic familiarity with Python

Getting API Keys for Google and Composio

Google API Key

Go to Google AI Studio and create an API key.
Copy the key and keep it safe. You will put this in GOOGLE_API_KEY.

Composio API Key and User ID

Log in to the Composio dashboard.
Go to Settings → API Keys and copy your Composio API key. Use this for COMPOSIO_API_KEY.
Decide on a stable user identifier to scope sessions, often your email or a user ID. Use this for COMPOSIO_USER_ID.

Install dependencies

bash

pip install google-adk composio python-dotenv

Inside your virtual environment, install the required packages.

What's happening:

google-adk is Google's Agents Development Kit
composio connects your agent to Workday via MCP
python-dotenv loads environment variables

Set up ADK project

bash

adk create my_agent

Set up a new Google ADK project.

What's happening:

This creates an agent folder with a root agent file and .env file

Set environment variables

bash

GOOGLE_API_KEY=your-google-api-key
COMPOSIO_API_KEY=your-composio-api-key
COMPOSIO_USER_ID=your-user-id-or-email

Save all your credentials in the .env file.

What's happening:

GOOGLE_API_KEY authenticates with Google's Gemini models
COMPOSIO_API_KEY authenticates with Composio
COMPOSIO_USER_ID identifies the user for session management

Import modules and validate environment

python

import os
import warnings

from composio import Composio
from dotenv import load_dotenv
from google.adk.agents.llm_agent import Agent
from google.adk.tools.mcp_tool.mcp_session_manager import StreamableHTTPConnectionParams
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset

load_dotenv()

warnings.filterwarnings("ignore", message=".*BaseAuthenticatedTool.*")

GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not GOOGLE_API_KEY:
    raise ValueError("GOOGLE_API_KEY is not set in the environment.")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment.")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment.")

What's happening:

os reads environment variables
Composio is the main Composio SDK client
GoogleProvider declares that you are using Google ADK as the agent runtime
Agent is the Google ADK LLM agent class
McpToolset lets the ADK agent call MCP tools over HTTP

Create Composio client and Tool Router session

python

composio_client = Composio(api_key=COMPOSIO_API_KEY)

composio_session = composio_client.create(
    user_id=COMPOSIO_USER_ID,
    toolkits=["workday"],
)

COMPOSIO_MCP_URL = composio_session.mcp.url,
print(f"Composio MCP URL: {COMPOSIO_MCP_URL}")

What's happening:

Authenticates to Composio with your API key
Declares Google ADK as the provider
Spins up a short-lived MCP endpoint for your user and selected toolkit
Stores the MCP HTTP URL for the ADK MCP integration

Set up the McpToolset and create the Agent

python

composio_toolset = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url=COMPOSIO_MCP_URL,
        headers={"x-api-key": COMPOSIO_API_KEY}
    )
)

root_agent = Agent(
    model="gemini-2.5-flash",
    name="composio_agent",
    description="An agent that uses Composio tools to perform actions.",
    instruction=(
        "You are a helpful assistant connected to Composio. "
        "You have the following tools available: "
        "COMPOSIO_SEARCH_TOOLS, COMPOSIO_MULTI_EXECUTE_TOOL, "
        "COMPOSIO_MANAGE_CONNECTIONS, COMPOSIO_REMOTE_BASH_TOOL, COMPOSIO_REMOTE_WORKBENCH. "
        "Use these tools to help users with Workday operations."
    ),
    tools=[composio_toolset],
)

print("\nAgent setup complete. You can now run this agent directly ;)")

What's happening:

Connects the ADK agent to the Composio MCP endpoint through McpToolset
Uses Gemini as the model powering the agent
Lists exact tool names in instruction to reduce misnamed tool calls

Run the agent

bash

# Run in CLI mode
adk run my_agent

# Or run in web UI mode
adk web

Execute the agent from the project root. The web command opens a web portal where you can chat with the agent.

What's happening:

adk run runs the agent in CLI mode
adk web . opens a web UI for interactive testing

Complete Code

Here's the complete code to get you started with Workday and Google ADK:

python

import os
import warnings

from composio import Composio
from composio_google import GoogleProvider
from dotenv import load_dotenv
from google.adk.agents.llm_agent import Agent
from google.adk.tools.mcp_tool.mcp_session_manager import StreamableHTTPConnectionParams
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset

load_dotenv()
warnings.filterwarnings("ignore", message=".*BaseAuthenticatedTool.*")

GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not GOOGLE_API_KEY:
    raise ValueError("GOOGLE_API_KEY is not set in the environment.")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment.")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment.")

composio_client = Composio(api_key=COMPOSIO_API_KEY, provider=GoogleProvider())

composio_session = composio_client.create(
    user_id=COMPOSIO_USER_ID,
    toolkits=["workday"],
)

COMPOSIO_MCP_URL = composio_session.mcp.url


composio_toolset = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url=COMPOSIO_MCP_URL,
        headers={"x-api-key": COMPOSIO_API_KEY}
    )
)

root_agent = Agent(
    model="gemini-2.5-flash",
    name="composio_agent",
    description="An agent that uses Composio tools to perform actions.",
    instruction=(
        "You are a helpful assistant connected to Composio. "
        "You have the following tools available: "
        "COMPOSIO_SEARCH_TOOLS, COMPOSIO_MULTI_EXECUTE_TOOL, "
        "COMPOSIO_MANAGE_CONNECTIONS, COMPOSIO_REMOTE_BASH_TOOL, COMPOSIO_REMOTE_WORKBENCH. "
        "Use these tools to help users with Workday operations."
    ),  
    tools=[composio_toolset],
)

print("\nAgent setup complete. You can now run this agent directly ;)")

Conclusion

You've successfully integrated Workday with the Google ADK through Composio's MCP Tool Router. Your agent can now interact with Workday using natural language commands.

Key takeaways:

The Tool Router approach dynamically routes requests to the appropriate Workday tools
Environment variables keep your credentials secure and separate from code
Clear agent instructions reduce tool calling errors
The ADK web UI provides an interactive interface for testing and development

You can extend this setup by adding more toolkits to the toolkits array in your session configuration.

TOOLS & TRIGGERS

Supported Tools and Triggers

Every Workday action and event your agent gets out of the box.

Create Business Title Change

Creates a business title change instance for a worker with the specified data.

Create Job Change

Tool to create a job change instance for a worker in Workday.

Create Payroll Inputs

Tool to create payroll inputs in Workday.

Create Time Off Request

Creates a time off request for the specified worker and initiates the business process.

Get Absence Balance

Retrieves balance information for a specific worker's absence plan.

Get Assignment Change Group Cost Centers

Retrieves cost center instances for organization assignment changes.

Get Assignment Change Group Jobs

Retrieves job instances for organization assignment changes.

Get Assignment Types

Retrieves assignment type values for job changes in Workday.

Get Business Title Change

Retrieves a business title change instance by ID.

Get Business Title Change For Worker

Tool to retrieve a business title change instance for a specific worker.

Get Candidate Availability Template

Tool to retrieve the candidate availability template version for a specific job posting.

Get Collection of Jobs

Tool to retrieve a paginated collection of jobs from Workday Staffing system.

Get Collection of Payroll

Tool to retrieve a collection of payroll inputs from Workday.

Get Company Insider Types

Retrieves company insider types from Workday Staffing API.

Get Contingent Worker Types

Tool to retrieve contingent worker types from Workday staffing API.

Get Country Info

Retrieves detailed information about a specific country from Workday.

Get Currencies

Retrieves currency instances for job changes in Workday.

Get Current User

Retrieves the current authenticated worker's profile information from Workday.

Get Grants

Retrieves grant instances for organization assignment changes.

Get Headcount Options

Retrieves headcount option instances that can be used as values for other endpoint parameters.

Get History Instance for Worker

Tool to retrieve a specific history instance for a worker.

Get History Items for Worker

Tool to retrieve a collection of history items for a specific worker.

Get Holiday Events

Returns the holiday events for the specified workers and time period.

Get Interview

Tool to retrieve detailed information about a specific interview from Workday Recruiting.

Get Interview Feedback

Retrieves interview feedback for the specified interview ID from Workday Recruiting API.

Get Job By ID

Tool to retrieve detailed information about a single job instance by its ID.

Get Job Change Frequencies

Retrieves frequency instances for job changes in Workday.

Get Job Change Location Info

Tool to retrieve location information for a specific job change in Workday.

Get Job Change Position

Retrieves position details for a specific job change in Workday Staffing API.

Get Job Change Reason Instance

Retrieves a job change reason instance from Workday.

Get Job Change Reasons

Retrieves a collection of job change reasons from Workday.

Get Job Change Reason Values

Retrieves job change reason instances that can be used as values for other staffing endpoint parameters.

Get Job Changes Group Templates

Retrieves job changes group template instances in Workday.

Get Job Changes Job Values

Retrieves job instances that can be used as values for job changes parameters.

Get Job Changes Worker Values

Retrieves worker instances that can be used as values for job changes parameters.

Get Job Classifications

Retrieves job classification instances for job changes in Workday.

Get Job Posting

Retrieves detailed information about a specific job posting including job description.

Get Job Posting Questionnaire

Retrieves screening questions and questionnaires associated with a specific job posting.

Get Job Profiles Values

Retrieves job profile instances from Workday Staffing API.

Get Job Requisition Values

Retrieves job requisition instances that can be used as values for other endpoint parameters.

Get Job Workspace

Tool to retrieve a single workspace instance for a specific job.

Get Job Workspaces

Tool to retrieve a collection of workspaces for a specified job ID.

Get Leave Status Values

Get all available leave status values from Workday.

Get My Job Postings

Retrieves job postings assigned to the authenticated user (current recruiter).

Get Organization Assignment Business Units

Retrieves business unit instances for organization assignment changes.

Get Organization Assignment Customs

Retrieves custom organization assignment instances.

Get Organization Assignment Funds

Retrieves fund instances for organization assignment changes.

Get Organization Assignment Regions

Retrieves region instances for organization assignment changes.

Get Organization Assignment Workers

Retrieves worker instances for organization assignment changes.

Get Pay Group by Job ID

Retrieves the pay group for a specified job ID.

Get Payroll Input Instance

Retrieves detailed information for a single payroll input instance by ID.

Get Pay Slip Instance for Worker

Retrieves a specific pay slip instance for a worker.

Get Pay Slips for Worker

Retrieves a collection of pay slips for a specific worker.

Get Proposed Position Values

Retrieves proposed position instances that can be used as values for job changes parameters.

Get Prospect

Retrieves a single prospect instance for talent matching and best-fit analysis.

Get Prospect Educations

Retrieves the educational background of a prospect from Workday Recruiting API for talent matching and best-fit analysis.

Get Prospect Experiences

Retrieves the work experience of a prospect for talent matching and best-fit analysis.

Get Prospect Resume Attachments

Retrieves resume attachments for a specific prospect to help prepare for upcoming interviews.

Get Prospect Skills

Retrieves the skills of a prospect from Workday Recruiting API for talent matching and best-fit analysis.

Get Supervisory Organization Values

Retrieves supervisory organization instances that can be used as values for job changes parameters.

Get Time Off Entries for Worker

Retrieves a collection of time off entries for a specific worker.

Get Time Off Plans For Worker

Retrieves a collection of time off plans for a specific worker.

Get Time Off Status Values

Retrieves available time off status values from Workday.

Get Time Types

Retrieves time type values for job changes in Workday.

Get Worker Business Title Changes

Retrieves business title changes for a specific worker.

Get Worker Eligible Absence Types

Retrieves a collection of eligible absence types for the specified worker.

Get Worker Info

Retrieves detailed worker information including staffing data.

Get Worker Leaves of Absence

Retrieves the Leaves Of Absence for the specified worker using the working absenceManagement v1 API.

Get Workers Collection Staffing

Tool to retrieve workers and current staffing information from Workday.

Get Worker Service Dates

Tool to retrieve service dates for a specified worker from Workday Staffing API v6.

Get Worker Staffing Information

Tool to retrieve a worker's current staffing information from Workday.

Get Worker Time Off Details

Retrieves a collection of time off details for the specified worker.

Get Worker Types

Retrieves worker type instances that can be used as values for job changes parameters.

Get Worker Valid Time Off Dates

Retrieves valid time off dates for a worker, indicating when they are eligible to take time off.

Get Workspace Instances

Tool to retrieve workspace instances that can be used as prompt values for other Workday API parameters.

Get Work Study Awards

Retrieves work study award instances for job changes in Workday.

List Countries

Retrieves country values from Workday Recruiting API.

List Interviews

Retrieves a list of interviews with job requisition and recruiter assignment details.

List Job Postings

Retrieves a paginated list of job postings from Workday Recruiting system.

List Jobs

Retrieves a collection of jobs from Workday Staffing system.

Retrieve Worker Leave of Absence

Retrieves the leave of absence details for a specified worker.

Update An Existing Payroll

Tool to partially update an existing payroll input instance in Workday.

Update Job Change Business Title

Partially updates the business title for a specific job change.

Update Message Template By ID

Tool to update a message template in Workday by its ID.

FRAMEWORKS

How to build Workday MCP Agent with another framework

ChatGPT

Use Workday MCP with ChatGPT

OpenAI Agents SDK

Use Workday MCP with OpenAI Agents SDK

Claude Agent SDK

Use Workday MCP with Claude Agent SDK

Claude Code

Use Workday MCP with Claude Code

Claude Cowork

Use Workday MCP with Claude Cowork

Codex

Use Workday MCP with Codex

Cursor

Use Workday MCP with Cursor

OpenClaw

Use Workday MCP with OpenClaw

Hermes

Use Workday MCP with Hermes

CLI

Use Workday MCP with CLI

LangChain

Use Workday MCP with LangChain

Vercel AI SDK

Use Workday MCP with Vercel AI SDK

Mastra AI

Use Workday MCP with Mastra AI

LlamaIndex

Use Workday MCP with LlamaIndex

CrewAI

Use Workday MCP with CrewAI

OpenCode

Use Workday MCP with OpenCode

VS Code

Use Workday MCP with VS Code

MORE TOOLKITS

Explore Other Toolkits

Toolkit marketplace

Ashby

Api Key

Ashby is an applicant tracking system that handles job postings, candidate management, and hiring analytics.

Async interview

Api Key

Async interview is an on-demand video interview platform for streamlined hiring. Candidates record responses on their schedule, so employers can review anytime.

Bamboohr

Oauth2Api Key

BambooHR is a cloud-based HR management platform for small and mid-sized businesses. It streamlines employee data, HR workflows, and reporting in one easy interface.

Breathe HR

Api Key

Breathe HR is cloud-based HR software for SMEs to manage employee data, absences, and performance. It simplifies HR admin, making it easy to keep employee records accurate and up to date.

FAQ

Frequently asked questions

With a standalone Workday MCP server, the agents and LLMs can only access a fixed set of Workday tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Workday and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Google ADK fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Workday tools.

Yes, absolutely. You can configure which Workday scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Workday data and credentials are handled as safely as possible.

Start with Workday.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Workday tool your agent needs.Free to start.

Start building

Customer stories

Teams ship real agents on Composio

GET STARTED FOR FREE BOOK A DEMO

Karan skipped his own birthday party to fix our critical issue. It was 10pm and he diverted his Waymo to help us instead. This really sets the bar — it shows the commitment you need when users rely on your software.

Harsha Gaddipati

Co-founder, Slashy

A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

Abhi Arya

Co-founder, Opennote

We chose Composio over Pipedream because it delivered depth where it mattered — niche tools and tricky edge cases other platforms simply ignored. That gave us confidence to scale without compromising.

Nirman Dave

CEO, Zams

As a solo builder, shipping fast is life or death. The only way I can outcompete incumbents is by outmanoeuvring them. Getting bogged down managing agent auth would have been a death sentence.

Ryan Yu

Founder, Extra Thursday

Before Composio, adding tool integrations was slow and resource-intensive. Each one could take weeks of engineering time, and maintaining them meant constantly keeping up with API changes.

Tomisin Jenrola

Founder & CEO, SwarmZero

With hands-on help from their founder, we integrated Gmail and Google Drive in just 30 minutes. This level of personal support and commitment is exactly what startups should strive for.

Jerome Leclanche

Co-Founder, Ingram Technologies

How to integrate Workday MCP with Google ADK

Connect Workday without auth hassles

Introduction

Also integrate Workday with

TL;DR

What is Google ADK?

What is the Workday MCP server, and what's possible with it?

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

How the Composio SDK works

Step-by-step Guide

Prerequisites

Getting API Keys for Google and Composio

Install dependencies

Set up ADK project

Set environment variables

Import modules and validate environment

Create Composio client and Tool Router session

Set up the McpToolset and create the Agent

Run the agent

Complete Code

Conclusion

Supported Tools and Triggers

How to build Workday MCP Agent with another framework

ChatGPT

OpenAI Agents SDK

Claude Agent SDK

Claude Code

Claude Cowork

Codex

Cursor

OpenClaw

Hermes

CLI

LangChain

Vercel AI SDK

Mastra AI

LlamaIndex

CrewAI

OpenCode

VS Code

Explore Other Toolkits

Ashby

Async interview

Bamboohr

Breathe HR

Frequently asked questions

What are the differences in Tool Router MCP and Workday MCP?+

Can I use Tool Router MCP with Google ADK?+

Can I manage the permissions and scopes for Workday while using Tool Router?+

How safe is my data with Composio Tool Router?+

Start with Workday.It takes 30 seconds.

Teams ship real agents on Composio