Copilot Studio Custom Connector Tutorial (Fake API)

Copilot Studio custom connector tutorial — even if your API doesn’t exist. In this step‑by‑step build, I create a fully working fake API and wire it into an agent using generative orchestration.

If you’ve ever needed to prototype in Copilot Studio but didn’t have access to a real backend (or an API key), this approach lets you move fast. We’ll create a custom connector from blank, generate realistic sample JSON with Copilot, inject C# logic to return different responses per action, and then test everything inside a Copilot Studio agent.

As a Microsoft Cloud Solution Architect and former Microsoft MVP, I use this exact pattern for proof‑of‑concept demos and rapid experimentation inside the Power Platform.

What You’ll Learn:
1️⃣ How to create a custom connector from blank in Copilot Studio (with a dummy host)
2️⃣ How to define multiple actions (Get Flights / Get Hotels) for a mock API
3️⃣ How to generate both JSON and stringified JSON using Copilot
4️⃣ How to update the C# code to return different arrays based on operation ID
5️⃣ How to import default responses so your agent can parse the schema
6️⃣ How to test the connector and use it with generative orchestration

⏱ Timestamps:
0:00 Introduction and Overview
1:01 Creating a Custom Connector
2:20 Defining Actions for API
4:10 Generating Sample JSON Data
6:00 Updating C# Code for Actions
8:41 Setting Default Responses
10:01 Testing the Custom Connector
11:30 Using Generative Orchestration

#CopilotStudio #PowerPlatform #AIAgents #MicrosoftCopilot


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👋 About Damien Bird
Microsoft Cloud Solution Architect | Former MVP u0026 Forum Super User
Helping you automate, build, and innovate with Power Platform u0026 AI

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