> For the complete documentation index, see [llms.txt](https://developer.harness.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.harness.io/harness-platform/3.0/in-harness-3.0.md).

# In Harness 3.0

- [Overview](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/overview.md): Learn the key concepts of the Harness Platform, including the four Harness Agents, accounts, organizations, projects, RBAC, delegates, connectors, and pipelines.
- [What's New](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/getting-started.md): Understand what the Harness Platform is, what changes between Harness NG and Harness 3.0, and what those changes mean for your pipelines.
- [What's Supported by Harness Platform](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/platform-whats-supported.md): Technologies supported by Harness Platform
- [Navigation](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/navigation.md): Learn how the Harness 3.0 navigation system works, including the sidebar, More menu, recent items, and keyboard shortcuts.
- [Scope Selector in Harness 3.0](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/navigation/scope.md): Learn how the Harness 3.0 scope selector works, including the scope hierarchy, project selector dialog, and pinning behavior.
- [General Settings in Harness 3.0](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/navigation/settings.md): Learn how to configure your Harness account using the Settings page, including general settings, account-level resources, access control, and security.
- [AI Assistant](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/navigation/assistant.md): Learn how to use the Harness AI Assistant to ask questions, generate pipeline configurations, troubleshoot failures, and perform actions directly from the navigation header.
- [Migrations & Compatibility](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/migrations-and-compatibility.md)
- [Migration Guide](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/migrations-and-compatibility/migration.md): Learn how to migrate from Harness NextGen (NG) to Harness 3.0.
- [Backward Compatibility](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/migrations-and-compatibility/compatibility.md)
- [Agents](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/agents.md): Bring AI automation directly into your pipelines with Harness Agents; governed by RBAC, OPA policies, audit logs, and GitX versioning.
- [Code Quality Agents](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/agents/code-quality.md): AI-powered agents for code review, test coverage, and CI failure remediation, powered by Claude AI and integrated into your Harness pipelines.
- [Security Agents](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/agents/security.md): AI-powered agents for vulnerability remediation and deployment failure analysis; Zero Day Remediation for CVE-based fixes across repos, and Manifest Remediator for Kubernetes and Helm deployment failu
- [Developer Productivity Agents](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/agents/developer-productivity.md): AI-powered agents for feature flag cleanup, framework upgrades, and repository onboarding, automating common engineering workflows that are tedious and time-consuming.
- [Building Custom Agents](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/agents/custom.md): Build, package, and register your own AI-powered agent plugins for Harness using the Drone plugin architecture; Go binaries in Docker containers, registered as pipeline templates.
- [Delegate 3.0](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/delegate.md): Learn about Delegate 3.0, a unified lightweight agent that serves all Harness products from a single installation, replacing separate per-product delegates.
- [Connectors](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/connectors.md): Connectors are integration endpoints that enable pipelines and other Harness resources to communicate with external services; a secure, reusable abstraction for credentials and connection details.
- [Connector Types](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/connectors/types.md): Reference for all connector types in Harness 3.0; code repositories, artifact registries, cloud providers, secret managers, infrastructure, monitoring, ticketing, and more.
- [Manage Connectors](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/connectors/manage.md): Step-by-step instructions for creating, viewing, testing, editing, and deleting connectors in Harness 3.0, along with best practices for organization and security.
- [Connector Configuration Reference](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/connectors/configure.md): Complete configuration examples for common connector types, including YAML definitions, Terraform HCL, and REST API endpoints.
- [Connector Troubleshooting](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/connectors/troubleshooting.md): Common connector issues, root causes, and step-by-step solutions for diagnosing and resolving connectivity problems in Harness 3.0.
- [Secrets](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/secrets.md): Harness Secrets provides a secure credential management system for CI/CD pipelines; store, manage, and reference sensitive data with full encryption, access control, and audit trails.
- [Secret Types](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/secrets/types.md): Harness supports two types of secrets; Text Secrets for inline string values and File Secrets for uploaded file content. Both are encrypted and can be stored in the built-in or any external secret man
- [Managing Secrets](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/secrets/manage.md): Create, use, rotate, and manage secrets throughout their lifecycle, including UI workflows, pipeline usage, API access, and Terraform automation.
- [Secrets Best Practices](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/secrets/configure.md): Best practices for creating, storing, rotating, auditing, and maintaining compliance for secrets in Harness 3.0; covering access control, rotation schedules, monitoring, and compliance standards.
- [Secrets Troubleshooting](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/secrets/troubleshooting.md): Diagnose and resolve common issues with secrets in Harness 3.0; secret not found, external manager connection failures, stale cached values, and file decode errors.
- [Dashboards](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/dashboards.md): Learn about Dashboards 3.0, a ground-up rebuild of the Harness dashboards experience powered by an internal engine, Harness Query Language (HQL), and AI-driven dashboard creation.
- [Harness Query Language (HQL) Reference](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/dashboards/hql.md): Complete reference for Harness Query Language (HQL), a domain-specific language for querying events, entities, metrics, and views across the Harness Data Platform.
- [Pipelines](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines.md): The v1 YAML specification for Harness 3.0 pipelines; reduced boilerplate, expression-based conditionals, typed inputs, and compatibility with GitHub Actions and Drone workflows.
- [Stages & Stage Groups](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/stages.md): Stages are the major execution blocks of a Harness 3.0 pipeline, each with its own runtime, caching, failure strategies, and steps. Supports sequential, parallel, matrix, and grouped execution.
- [Steps](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/steps.md): Steps are the smallest executable units in a Harness 3.0 pipeline; run scripts, invoke actions, request approvals, manage background services, and more.
- [Step Library](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/steps/steps.md): Harness 3.0 ships with 109+ pre-built step templates across CI, CD, IaCM, CV, and Integration modules; versioned, containerized actions that are the building blocks of pipelines.
- [CI Steps Reference](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/steps/ci.md): Reference for all Harness CI step templates; building, testing, scanning, caching, and publishing artifacts within CI pipelines.
- [Kubernetes & Helm Steps](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/steps/kubernetes.md): Reference for all Kubernetes and Helm step templates in Harness 3.0; rolling, blue-green, canary deployments, plus utility operations for scaling, patching, and traffic routing.
- [Cloud Deployment Steps](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/steps/cloud.md): Reference for cloud deployment step templates in Harness 3.0; AWS ECS, Google Cloud Run, Azure Functions, AWS CDK, AWS SAM, and Serverless Framework.
- [Infrastructure as Code Steps](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/steps/iacm.md): Reference for IaCM step templates in Harness 3.0; Terraform, OpenTofu, TFLint, and Tofu Module Test for full infrastructure lifecycle management within pipelines.
- [Integration Steps Reference](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/steps/integrations.md): Reference for integration step templates in Harness 3.0; HTTP, email, Jira, ServiceNow, Jenkins, Bamboo, SSH, WinRM, and AI Verify.
- [Step Template Guide](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/steps/templates.md): A comprehensive guide for adding new step templates to the Harness Template Library; from non-technical overview to full technical schema reference.
- [Services & Environments](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/services.md): Services define what you are deploying; environments define where. Together they configure the deployment target for a Harness 3.0 pipeline stage.
- [Infrastructure & Runtimes](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/infrastructure.md): Configure the compute resources where Harness 3.0 pipeline stages execute; Cloud, Kubernetes, Shell, and VM runtimes with platform and machine size options.
- [Inputs & Variables](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/inputs.md): Typed pipeline inputs, expression syntax, and output variables for building dynamic, reusable Harness 3.0 pipelines.
- [Expression Mapping](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/expressions.md): Complete reference mapping built-in expressions from Harness NG to Harness 3.0, new ${{ }} syntax, snake\_case naming, and all expression contexts.
- [Advanced Configuration](https://developer.harness.io/harness-platform/3.0/in-harness-3.0/pipelines/advanced.md): Advanced Harness 3.0 pipeline capabilities; caching, volumes, failure strategies, execution strategies, concurrency control, container configuration, clone settings, permissions, and test reporting.