Workday Extend AI testing
Workday Extend AI Testing: A Checklist for Apps and Agents
Introduction
Workday now lets your team build agents on its own platform, and every agent you build is something you have to test.
On 13 October 2026, Workday said its Trusted Agent Platform now offers headless access to HR and finance. That puts custom apps, agents and data flows in the hands of your own builders. Workday Extend AI testing is how you check they behave before employees rely on them.
This post covers the new builder tools and gives you a checklist for custom apps, agents and data flows. You will also see which parts to retest after each release.
Key takeaways
Workday’s Trusted Agent Platform brings together Data Cloud, Agent-Ready Tools, Developer Agent, Custom Agents and Agent Harness.
Builders can describe an agent in plain language, so more people will create agents. Testing cannot stay with a few specialists.
Test each layer on its own: the data coming in, the tools, the agent’s behaviour and the security around it.
Check that every action traces back to both the person and the agent.
Keep a short Workday regression testing set and rerun it after each release.
Why Workday Extend AI testing matters now
What builders get
According to Workday’s newsroom announcement, the Workday Trusted Agent Platform brings together Workday Data Cloud, Agent-Ready Tools, Developer Agent, Custom Agents and Agent Harness. Workday describes these as generally available. Developer Agent builds a custom agent from a plain-language request, and Workday’s blog says the agent runs inside Workday’s guardrails.
<!-- SOURCE NEEDED: confirm general availability of each component (Data Cloud, Agent-Ready Tools, Developer Agent, Custom Agents, Agent Harness) for your tenant and region --> <!-- SOURCE NEEDED: confirm Workday's own definition of "headless access"; the post does not explain it in detail -->
What comes next
Workday says Agent Harness will add Agent Context Service and Grounded Reasoning in early 2027. New capabilities mean changing behaviour under your agents, so a test set you build now will be reused.
Why the next few weeks matter
Builders can start today, and plain-language building lowers the bar for who creates agents. Without a shared test habit, untested agents spread across teams. Set your standards before the first custom agent reaches production.
Example: testing an internal mobility agent
Illustrative, not a real customer.
A company wants to test one of its Workday custom agents, an internal mobility agent that matches employees to open roles using trusted job data. A builder asks Developer Agent to create it, then reviews which Agent-Ready Tools it chose. Before any employee sees it, the test lead runs it through the layers below.
She uses a sandbox, five test personas and a written pass mark for each layer. The first run shows the agent suggesting a role the manager should not see. The team fixes the access, reruns that layer and keeps the result. Only then does a small pilot group get the agent.
Test checklist for apps, agents and data flows
Layer | What to test | Pass looks like |
|---|---|---|
Data in | Workday Data Cloud testing: row counts, field mapping, freshness and access limits | Numbers match the source, and restricted data stays restricted |
Tools | Each Agent-Ready Tool with valid, empty and wrong inputs | Correct result or a clear error, with no partial change |
Agent behaviour | Plain-language prompts, edge cases and conflicting requests | Consistent answers, and out-of-scope tasks are refused |
Security | Each persona asks for data they should and should not see | Replies match Workday security rules |
Approvals and logs | Actions that need approval, then the log trail | Every action traces to the person and the agent |
Integrations | Workday integration testing for downstream systems and chat channels | Data arrives once, correct, in every channel |
Release regression | Core cases rerun after each release | No change, or a change you understand |
How PeopleFlow helps
Builders move fast, so testers need to keep pace. PeopleFlow’s no-code Workday testing comes with 1000+ pre-built tests for HCM, Payroll, Finance and Integrations, which protect the core processes your custom apps and agents depend on. Rerun them after each release to catch side effects early. Our Workday AI agents include Configuration, Report, Support, Testing and Integration agents. See the Workday testing page and the AI agents page. PeopleFlow is a Workday Innovation Silver Partner.
Frequently asked questions
What is the Workday Trusted Agent Platform?
Per Workday, it is where organisations build and run AI agents that follow their business rules. It brings together Workday Data Cloud, Agent-Ready Tools, Developer Agent, Custom Agents and Agent Harness. Check each component’s availability for your own tenant and region before you plan a build.
How do I test a custom agent built with Developer Agent?
Test it in layers. Check the data it reads, each Agent-Ready Tool it calls, how it answers edge cases, and what each persona can see. Confirm approvals work and that logs trace each action to the person and the agent. Run this in a sandbox before any pilot.
How do I test Workday Data Cloud data flows?
Compare a sample from the source with what the agent or app receives: row counts, field mapping and freshness. Then check that restricted data stays restricted for each role. Test an empty feed and a late feed, and rerun the checks after each Workday release or schema change.
What should I retest after a Workday release?
Retest the core cases for each custom app, agent and data flow: security roles, approvals, key prompts and downstream feeds. Releases can change configuration and platform behaviour, and Workday plans to add Agent Context Service and Grounded Reasoning to Agent Harness in early 2027. Keep a short, repeatable set.
Conclusion
Workday Extend AI testing turns the new builder tools into something your business can trust. Test the data, the tools, the agent and the security in layers, then keep a short regression set for every release. Start before the first custom agent reaches users, and write down the pass marks. To build that baseline faster, try PeopleFlow yourself or book a short demo.
