azure-pipelines-vscode | VS Code extension for working with Azure Pipelines YAML | Azure library

How to add and validate custom build task in Azure DevOps YAML File via VS Code

I could not reproduce this issue with the extension docs-yaml.

Then I test another commonly used extension Azure Pipelines, I could reproduce this issue as you. So I boldly assume that this verification should come from the extended Azure Pipelines. You could check if you have installed this extension in your Visual Studio code.

After installing that extension and restart the VS Code, I could see the verification info:

To resolve this, we could move on the document Azure Pipelines for VS Code：

Out of the box, the extension has a generic schema file that includes only in-box tasks. You probably have custom tasks installed in your organization. To teach the extension about those, grab a copy of your schema and tell the extension where to find it.

1. Visit https://dev.azure.com/YOU-ORG-HERE/_apis/distributedtask/yamlschema and save the output as my-schema.json.
2. Edit your workspace's settings.json to include this: {
   "[azure-pipelines].customSchemaFile": "./path/to/my-schema.json" }
3. Restart VS Code. The extension will now validate against your schema. It'll give you autocompletes for your custom tasks.

Detailed steps for the second step:

Click the gear button in the lower left corner of your VS code, Manage-> Settings, then click Workspace->Extensions->Azure pipeline:

I save the yamlschema.json file in the folder where the settings.json is.

After restarting the VS Code, I could successfully validate that build task in VS Code: