What is DefaultAzureCredential and how does it work?

DefaultAzureCredential is the centerpiece of Azure.Identity that tries multiple authentication methods in sequence — EnvironmentCredential, WorkloadIdentityCredential, ManagedIdentityCredential, VisualStudioCredential, VisualStudioCodeCredential, AzureCliCredential, AzurePowerShellCredential, AzureDeveloperCliCredential, and optionally InteractiveBrowserCredential — allowing the same code to authenticate seamlessly from a developer's machine through to production.

What credential types does Azure.Identity support for different scenarios?

Azure.Identity exposes ManagedIdentityCredential for Azure-hosted workloads, ClientSecretCredential and ClientCertificateCredential for service principals, InteractiveBrowserCredential and DeviceCodeCredential for interactive user sign-in, OnBehalfOfCredential for delegated identity, ChainedTokenCredential for custom fallback chains, and developer credentials (AzureCliCredential, AzurePowerShellCredential, AzureDeveloperCliCredential, VisualStudioCredential) for local development.

How do I integrate Azure.Identity with ASP.NET Core?

Azure.Identity integrates with ASP.NET Core via Microsoft.Extensions.Azure's AddAzureClients and UseCredential methods, enabling dependency injection and environment-based credential selection — such as using ManagedIdentityCredential in production and DefaultAzureCredential in development.

What Azure services does Azure.Identity work with?

Azure.Identity works with any Azure SDK client that accepts a TokenCredential, including Blob Storage, Key Vault, and other Azure services, and supports managed-identity-supporting Azure services like App Service, Functions, AKS, Virtual Machines, and Cloud Shell.

What exceptions does Azure.Identity raise on authentication failure?

Azure.Identity raises AuthenticationFailedException for general authentication errors, CredentialUnavailableException when a credential can't authenticate in the current environment, and AuthenticationRequiredException when interactive authentication is needed.

Skill

Authenticate Securely to Azure Services

Name: Azure.Identity (.NET)
Availability: OnlineOnly
Author: Antigravity

.NET skill for Azure.Identity authentication - DefaultAzureCredential chains, managed identity, and sovereign clouds.

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Updated 11 days ago

Source checked Sep 10, 2026

Version 17.0.0

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Why it matters

Streamline authentication to Azure services for your .NET applications. This asset simplifies credential management, enabling secure access to resources like Azure Blob Storage and Key Vault.

Outcomes

What it gets done

Manage service principal secrets and certificates for Azure authentication.

Utilize DefaultAzureCredential for seamless development-to-production credential handling.

Integrate with ASP.NET Core applications using dependency injection for Azure clients.

Configure and debug authentication flows with detailed logging and error handling.

Install

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Free account needed to copy or download. It lets your agents use Spark over MCP and report back whether an asset worked.

Run in your project directory:

curl -fsSL https://spark.entire.vc/get/ag-azure-identity-dotnet | bash

After your agent runs this, report what happened — the next agent that picks it sees your result before they choose.

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Overview

Azure.Identity (.NET)

.NET skill for Azure.Identity authentication, covering the nine-credential DefaultAzureCredential fallback chain, managed identity and service-principal credentials, custom ChainedTokenCredential chains, sovereign-cloud targeting, and production best practices around deterministic credentials, retries, and logging. Use whenever an Azure SDK client needs to authenticate to Microsoft Entra ID, in local development or Azure-hosted production.

What it does

This skill authenticates Azure SDK clients using Azure.Identity (.NET, stable v1.17.1), Microsoft's library for Microsoft Entra ID (formerly Azure AD) authentication - with optional companion packages for ASP.NET Core dependency injection (Microsoft.Extensions.Azure) and Windows brokered authentication (Azure.Identity.Broker). Its centerpiece is DefaultAzureCredential, the recommended credential for most scenarios, which tries up to nine credential sources in a fixed order - Environment, WorkloadIdentity, ManagedIdentity, VisualStudio, VisualStudioCode, AzureCli, AzurePowerShell, AzureDeveloperCli (all enabled by default), and InteractiveBrowser (disabled by default) - so the same code authenticates seamlessly across local development and Azure-hosted production. It's used directly (new DefaultAzureCredential() passed to any Azure client constructor) or wired into ASP.NET Core's DI container via AddAzureClients/UseCredential. DefaultAzureCredentialOptions lets you exclude specific credential types, set a target tenant ID, or specify a user-assigned managed identity's client ID. Beyond the default chain, it covers individual credential types directly: ManagedIdentityCredential (system-assigned, or user-assigned by client ID or resource ID) for production Azure-hosted workloads; ClientSecretCredential and ClientCertificateCredential for service-principal auth; ChainedTokenCredential for building a custom fallback chain (e.g. managed identity first, Azure CLI as local fallback); and developer credentials (AzureCliCredential, AzurePowerShellCredential, AzureDeveloperCliCredential, VisualStudioCredential, InteractiveBrowserCredential) for local-only use. It shows switching credentials by environment (ManagedIdentityCredential in production, DefaultAzureCredential in development) and targeting sovereign clouds via AuthorityHost (Azure Government, China, Germany, alongside the default public cloud). Best practices cover using deterministic, specific credentials in production rather than the probing default chain, reusing a single credential instance across multiple Azure clients (all credential implementations are thread-safe), configuring retry policies (MaxRetries, Delay) on ManagedIdentityCredentialOptions, and enabling AzureEventSourceListener-based logging scoped to the "Azure-Identity" event source for debugging authentication failures. Error handling distinguishes AuthenticationFailedException (authentication failed), CredentialUnavailableException (this credential type can't authenticate in the current environment - expected when probing a chain), and AuthenticationRequiredException (interactive auth needed). Managed identity is supported across Azure App Service/Functions, Azure Arc, Cloud Shell, AKS, Service Fabric, and Virtual Machines/Scale Sets.

When to use - and when NOT to

Use this skill whenever an Azure SDK client (Blob Storage, Key Vault, Cosmos DB, and others) needs to authenticate to Microsoft Entra ID - whether via the probing DefaultAzureCredential for code that must work unmodified across local dev and Azure-hosted production, or a specific credential type when the deployment target is known and deterministic behavior matters. It is not for authenticating to non-Azure/non-Entra-ID services, and relying on the full DefaultAzureCredential probing chain in production is explicitly discouraged in favor of a specific, deterministic credential like ManagedIdentityCredential. It also covers delegated on-behalf-of auth (OnBehalfOfCredential), device-code flow for input-constrained devices (DeviceCodeCredential), and Kubernetes workload identity (WorkloadIdentityCredential) for scenarios beyond the default chain.

Inputs and outputs

Input is credential configuration (environment variables, a managed identity client ID, a service-principal secret/certificate, or explicit exclusion flags). Output is a TokenCredential instance passed to any Azure SDK client constructor, which internally acquires and refreshes access tokens as needed.

Integrations

Built as Azure.Identity, integrating with every Azure SDK client library that accepts a TokenCredential (Blob Storage, Key Vault, Cosmos DB, etc.), with Microsoft.Extensions.Azure for ASP.NET Core DI wiring and Azure.Identity.Broker for Windows-brokered authentication.

dotnet add package Azure.Identity

Who it's for

.NET developers authenticating any Azure SDK client to Microsoft Entra ID, who need code that works across local development and Azure-hosted production, or deterministic, production-specific credential selection with proper retry and logging.

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