# System variables

This page lists built-in variables Octopus provides for use in deployment processes, runbooks, and [custom scripts](/docs/deployments/custom-scripts).

**All Octopus variables are strings**, even when the value looks like a number or a boolean.

## Release variables

Release-level variables are drawn from the project and release being created, and are available throughout a deployment or runbook run.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Release.Id` | The ID of the release. | `releases-123` |
| `Octopus.Release.Number` | The version number of the release. | `1.2.3` |
| `Octopus.Release.Notes` | Release notes associated with the release, in Markdown format. | Fixes bugs 1, 2, and 3 |
| `Octopus.Release.Created` | The date and time the release was created. | Tuesday, September 10, 1:23 PM |
| `Octopus.Release.CustomFields[name]` | The value of a custom field set on the release. | `TST-123` |
| `Octopus.Release.Channel.Name` | The channel name associated with the release. | 2.x Feature Branch |
| `Octopus.Release.Previous.Id` | The ID of the previous release of the project. | `releases-122` |
| `Octopus.Release.Previous.Number` | The version number of the previous release of the project. | `1.2.2` |
| `Octopus.Release.PreviousForEnvironment.Id` | The ID of the previous release of the project to the current environment. | `releases-122` |
| `Octopus.Release.PreviousForEnvironment.Number` | The version number of the previous release of the project to the current environment. | `1.2.2` |
| `Octopus.Release.CurrentForEnvironment.Id` | The ID of the release of the last successful deployment to the current environment. | `releases-122` |
| `Octopus.Release.CurrentForEnvironment.Number` | The version number of the release of the last successful deployment to the current environment. | `1.2.2` |
| `Octopus.Release.Git.BranchName` | The branch name the release was created from. Available for version-controlled projects. | `features/some-new-feature` |
| `Octopus.Release.Git.CommitHash` | The commit hash the release was created from. Available for version-controlled projects. | `0c708f...6eba` |
| `Octopus.Release.Git.Ref` | The git reference the release was created from. Available for version-controlled projects. | `refs/heads/main` |

## Release package and build information variables

These variables expose the build information pushed from your build server for the packages in a release. They're populated only when build information has been pushed, and they're available only in project release notes, not in deployment steps. Each variable is a collection; see [Variable substitution syntax](/docs/projects/variables/variable-substitutions/) for how to iterate and index collections.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Release.Package` | The packages, with their commits and work items, associated with the release. A collection of package objects. | `#{Octopus.Release.Package[Acme.Web].Version}` |
| `Octopus.Release.Builds` | The build and version-control details associated with the release. A collection of build objects. | `#{Octopus.Release.Builds[0].BuildUrl}` |
| `Octopus.Release.WorkItems` | The distinct work items across all packages in the release. A collection of work item objects. | `#{Octopus.Release.WorkItems[0].Id}` |

### Package object properties

| Property | Description | Example |
| --- | --- | --- |
| `PackageId` | The ID of the package. | `#{package.PackageId}` |
| `Version` | The version of the package. | `#{package.Version}` |
| `Commits` | The commits associated with the package. A collection. | `#{package.Commits[0].CommitId}` |
| `WorkItems` | The work items associated with the package. A collection. | `#{package.WorkItems[0].Id}` |

### Commit properties (release package and build info)

| Property | Description | Example |
| --- | --- | --- |
| `CommitId` | The commit ID. When using Git, this is the commit hash. | `#{commit.CommitId}` |
| `LinkUrl` | A link to the commit. | `#{commit.LinkUrl}` |
| `Comment` | The commit message. | `#{commit.Comment}` |

### Work item properties (release package and build info)

| Property | Description | Example |
| --- | --- | --- |
| `Id` | The work item ID. | `#{issue.Id}` |
| `LinkUrl` | A link to the work item. | `#{issue.LinkUrl}` |
| `Description` | A description of the work item. | `#{issue.Description}` |

### Build properties

| Property | Description | Example |
| --- | --- | --- |
| `Packages` | A JSON array of the packages created by the build. A collection. | `#{build.Packages}` |
| `BuildUrl` | A link to the CI build. | `#{build.BuildUrl}` |
| `Branch` | The version-control branch associated with the build. | `#{build.Branch}` |
| `BuildEnvironment` | The CI server that ran the build. | `#{build.BuildEnvironment}` |
| `BuildNumber` | The build number associated with the build. | `#{build.BuildNumber}` |
| `VcsRoot` | A link to the version-control repository associated with the build. | `#{build.VcsRoot}` |
| `VcsType` | The type of version control associated with the build. | `#{build.VcsType}` |
| `VcsCommitNumber` | The commit ID associated with the build. | `#{build.VcsCommitNumber}` |
| `VcsCommitUrl` | A link to the commit associated with the build. | `#{build.VcsCommitUrl}` |

### Build package properties

| Property | Description | Example |
| --- | --- | --- |
| `PackageId` | The ID of the package created by the build. | `#{build.Packages[0].PackageId}` |
| `Version` | The version of the package created by the build. | `#{build.Packages[0].Version}` |

## Deployment variables

Deployment-level variables are drawn from the project and release being deployed, and the infrastructure being deployed to.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Acquire.MaxParallelism` | The maximum number of packages deployed concurrently to multiple targets. Default: 10. | `2` |
| `Octopus.Acquire.DeltaCompressionEnabled` | Whether delta compression is used when sending packages to targets. | `true` |
| `Octopus.Deployment.Comments` | User-provided comments on the deployment. | Signed off by Alice |
| `Octopus.Deployment.Created` | The date and time the deployment was created. | Tuesday, September 10, 1:23 PM |
| `Octopus.Deployment.CreatedBy.DisplayName` | The full name of the user who started the deployment. | Alice King |
| `Octopus.Deployment.CreatedBy.EmailAddress` | The email address of the user who started the deployment. | `alice@example.com` |
| `Octopus.Deployment.CreatedBy.Id` | The ID of the user who started the deployment. | `users-123` |
| `Octopus.Deployment.CreatedBy.Username` | The username of the user who started the deployment. | `alice` |
| `Octopus.Deployment.Error` | The error or exit code for a failed deployment. | Script returned exit code 123 |
| `Octopus.Deployment.ErrorDetail` | The error or exit code for a failed deployment, with the Octopus stack trace. | `System.IO.FileNotFoundException: file C:\Missing.txt does not exist` |
| `Octopus.Deployment.ForcePackageDownload` | Whether the package is downloaded fresh from the feed regardless of whether it's already on the target. | `False` |
| `Octopus.Deployment.Id` | The ID of the deployment. | `deployments-123` |
| `Octopus.Deployment.Name` | The name of the deployment. | Deploy to Production |
| `Octopus.Deployment.PreviousSuccessful.Id` | The ID of the previous successful deployment of this project to the target environment. | `deployments-122` |
| `Octopus.Deployment.Machines` | The IDs of the machines targeted by the deployment. | `machines-123,machines-124` |
| `Octopus.Deployment.SpecificMachines` | The specific machines targeted by the deployment, if any. | `machines-123,machines-124` |
| `Octopus.Deployment.ExcludedMachines` | The IDs of machines excluded from the deployment, usually because they were unavailable. | `machines-123,machines-124` |
| `Octopus.Deployment.Tenant.Id` | The ID of the tenant being deployed for. Not present for untenanted deployments. | `Tenants-123` |
| `Octopus.Deployment.Tenant.Name` | The name of the tenant being deployed for. Not present for untenanted deployments. | Acme Corp |
| `Octopus.Deployment.Tenant.Tags` | A comma-separated list of the tenant's tags. Not present for untenanted deployments. | Tenant type/External, Upgrade ring/Early adopter |
| `Octopus.Deployment.Trigger.Id` | The ID of the trigger that created the deployment. If several triggers apply, the ID of one of them. | `ProjectTriggers-522` |
| `Octopus.Deployment.Trigger.Name` | The name of the trigger that created the deployment. If several triggers apply, the name of one of them. | Nightly Deploy to Dev |
| `Octopus.Deployment.WorkerLeaseCap` | An opt-in cap on how many steps referencing the same package reuse a single worker before another is selected. Disabled by default; set to a number above zero to opt in. Applies to deployments and runbooks. | `5` |
| `Octopus.Deployment.Targets` | The distinct targets being deployed to across all steps. A dictionary of objects with `Id` and `Name` properties, keyed on ID. | `#{Octopus.Deployment.Targets[machines-123].Name}` |
| `Octopus.Endpoint.type.property` | Properties describing the endpoint being deployed to. | `ftp.example.com` |
| `Octopus.Environment.Id` | The ID of the environment. | `environments-123` |
| `Octopus.Environment.MachinesInRole[role]` | The machines with the specified target tag being deployed to. | `machines-123,machines-124` |
| `Octopus.Environment.Name` | The name of the environment. | Production |
| `Octopus.Environment.SortOrder` | The order applied to the environment on the dashboard and elsewhere. | `3` |
| `Octopus.Machine.Id` | The ID of the machine. | `machines-123` |
| `Octopus.Machine.Name` | The name used to register the machine in Octopus. Not the same as the hostname. | `WEBSVR01` |
| `Octopus.Machine.Roles` | The target tags associated with the machine. | `web-server,frontend` |
| `Octopus.Machine.Hostname` | The host part of the URI used to register the machine. Set only for Listening Tentacles. | `192.168.200.100` |
| `Octopus.Project.Id` | The ID of the project. | `projects-123` |
| `Octopus.Project.Name` | The name of the project. | `OctoFx` |
| `Octopus.ProjectGroup.Id` | The ID of the project group. | `project-groups-123` |
| `Octopus.ProjectGroup.Name` | The name of the project group. | Public Web Properties |
| `Octopus.Space.Id` | The ID of the space. | `Spaces-1` |
| `Octopus.Space.Name` | The name of the space. | Dev Space |
| `Octopus.Task.Argument[name]` | An argument value provided when the task was created. | `deployments-123` |
| `Octopus.Task.Id` | The ID of the task. | `server-tasks-123` |
| `Octopus.Task.Name` | The name of the task. | Deploy release 1.2.3 to Production |
| `Octopus.Task.QueueTime` | The date and time the task should be queued for execution. | Tuesday, September 10, 1:30 PM |
| `Octopus.Task.QueueTimeExpiry` | The date and time before which the task must start. | Tuesday, September 10, 2:30 PM |
| `Octopus.Tentacle.CurrentDeployment.PackageFilePath` | The path to the package file being deployed. | `C:\Octopus\Tentacle\Packages\OctoFx.1.2.3.nupkg` |
| `Octopus.Tentacle.CurrentDeployment.TargetedRoles` | The intersection of the target tags targeted by the step and those on the machine. | `web-server` |
| `Octopus.Tentacle.PreviousInstallation.CustomInstallationDirectory` | The directory the previous version of the package was deployed to. | `C:\InetPub\WWWRoot\OctoFx` |
| `Octopus.Tentacle.PreviousInstallation.OriginalInstalledPath` | The directory the previous version of the package was extracted to. | `C:\Octopus\Tentacle\Apps\Production\OctoFx\1.2.2` |
| `Octopus.Tentacle.PreviousInstallation.PackageFilePath` | The path to the previously deployed package file. | `C:\Octopus\Tentacle\Packages\OctoFx.1.2.2.nupkg` |
| `Octopus.Tentacle.PreviousInstallation.PackageVersion` | The previous version of the package deployed to the Tentacle. | `1.2.2` |
| `Octopus.Web.ProjectLink` | A path relative to the Octopus Server URL where the project can be viewed. | `/app/projects/projects-123` |
| `Octopus.Web.ReleaseLink` | A path relative to the Octopus Server URL where the release can be viewed. | `/app/releases/releases-123` |
| `Octopus.Web.DeploymentLink` | A path relative to the Octopus Server URL where the deployment can be viewed. | `/app/deployment/deployments-123` |

## Deployment change variables

These variables expose the changes included in a deployment, aggregated across the releases being deployed. They're available only where build information has been pushed and, for work items, an issue tracker integration is enabled. Several are JSON collections; see [Variable substitution syntax](/docs/projects/variables/variable-substitutions/) for how to iterate and index them.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Deployment.Changes` | A JSON array of release-change objects, one per release, each with its release notes and build information. | `#{Octopus.Deployment.Changes[0].Version}` |
| `Octopus.Deployment.WorkItems` | A JSON array of the distinct work items across all changes in the deployment. | `#{Octopus.Deployment.WorkItems[0].Id}` |
| `Octopus.Deployment.PackageBuildInformation` | A JSON array of the distinct package build information across all changes in the deployment. | `#{Octopus.Deployment.PackageBuildInformation[0].PackageId}` |
| `Octopus.Deployment.ChangesMarkdown` | The output of applying the project's deployment changes template, in Markdown. | `#{Octopus.Deployment.ChangesMarkdown}` |

### Release change properties

| Property | Description | Example |
| --- | --- | --- |
| `Version` | The release version. | `#{change.Version}` |
| `ReleaseNotes` | The release notes, in Markdown. | `#{change.ReleaseNotes}` |
| `BuildInformation` | The build information for each package in the release. A collection. | `#{change.BuildInformation[0].PackageId}` |
| `WorkItems` | The work items for the release. A collection. | `#{change.WorkItems[0].Id}` |
| `Commits` | The commits for the release. A collection. | `#{change.Commits[0].Id}` |

### Package build information properties

| Property | Description | Example |
| --- | --- | --- |
| `PackageId` | The ID of the package. | `#{info.PackageId}` |
| `Version` | The version of the package. | `#{info.Version}` |
| `BuildEnvironment` | The CI server that ran the build. | `#{info.BuildEnvironment}` |
| `BuildNumber` | The build number associated with the build. | `#{info.BuildNumber}` |
| `BuildUrl` | A link to the CI build. | `#{info.BuildUrl}` |
| `Branch` | The version-control branch associated with the build. | `#{info.Branch}` |
| `VcsType` | The type of version control associated with the build. | `#{info.VcsType}` |
| `VcsRoot` | A link to the version-control repository. | `#{info.VcsRoot}` |
| `VcsCommitNumber` | The commit ID associated with the build. | `#{info.VcsCommitNumber}` |
| `VcsCommitUrl` | A link to the commit associated with the build. | `#{info.VcsCommitUrl}` |
| `WorkItems` | The work items for the package. A collection. | `#{info.WorkItems[0].Id}` |
| `Commits` | The commits for the package. A collection. | `#{info.Commits[0].Id}` |

### Work item properties (deployment change)

| Property | Description | Example |
| --- | --- | --- |
| `Id` | The work item ID. | `#{workItem.Id}` |
| `LinkUrl` | A link to the work item. | `#{workItem.LinkUrl}` |
| `Source` | The issue tracker the work item came from. | `#{workItem.Source}` |
| `Description` | A description of the work item. | `#{workItem.Description}` |

### Commit properties (deployment change)

| Property | Description | Example |
| --- | --- | --- |
| `Id` | The commit ID. | `#{commit.Id}` |
| `LinkUrl` | A link to the commit. | `#{commit.LinkUrl}` |
| `Comment` | The commit message. | `#{commit.Comment}` |

## Action variables

Action-level variables are available while an action runs.

You can also read these variables for a different action using indexed notation, for example `Octopus.Action[ActionName].IsSkipped`. This is useful when [writing run conditions](/docs/projects/variables/system-variables/#tracking-deployment-status) that depend on another action's status.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Action.Container.Image` | The name of the container image being deployed. | `OctoFx-RateService` |
| `Octopus.Action.Id` | The ID of the action. | `85287bef-fe6c-4eb7-beef-74f5e5a6b5b0` |
| `Octopus.Action.IsSkipped` | Whether the action was skipped in the current deployment. Can be `True` or empty. | `True` |
| `Octopus.Action.Manual.Instructions` | The instructions provided for a manual step. | Don't break anything |
| `Octopus.Action.Manual.ResponsibleTeamIds` | The teams responsible for completing a manual step. | `teams-123,teams-124` |
| `Octopus.Action.MaxParallelism` | The maximum number of targets an action runs on concurrently, and the maximum number of steps that run in parallel. Some built-in steps ignore this value. Default: 10. | `5` |
| `Octopus.Action.Name` | The name of the action. | Website |
| `Octopus.Action.Number` | The sequence number of the action in the deployment process. | `5` |
| `Octopus.Action.Package.CustomInstallationDirectory` | The specific directory the package is copied to after extraction, if set. | `C:\InetPub\WWWRoot\OctoFx` |
| <code>Octopus.Action.Package<wbr>.CustomInstallation<wbr>DirectoryShouldBePurged<wbr>BeforeDeployment</code> | Whether all files in the custom installation directory are deleted before deployment. | `False` |
| `Octopus.Action.Package.DownloadOnTentacle` | Whether the package is downloaded by the Tentacle rather than pushed by the Octopus Server. | `False` |
| <code>Octopus.Action.Package<wbr>.TreatConfig<wbr>TransformationWarnings<wbr>AsErrors</code> | Whether warnings in .NET configuration transformations fail the deployment. | `True` |
| <code>Octopus.Action.Package<wbr>.IgnoreConfig<wbr>TransformationErrors</code> | Whether errors in .NET configuration transformations are treated as informational rather than failing the deployment. | `False` |
| <code>Octopus.Action.Package<wbr>.IgnoreVariable<wbr>ReplacementErrors</code> | Whether errors in variable replacement are treated as a warning rather than failing the deployment. | `False` |
| `Octopus.Action.Package.InstallationDirectoryPath` | The directory the package was installed to. Not available before extraction. | `C:\InetPub\WWWRoot\OctoFx` |
| `Octopus.Action.Package.FeedId` | The ID of the feed the package was pulled from. | `feeds-123` |
| `Octopus.Action.Package.PackageId` | The ID of the package being deployed. | `OctoFx.RateService` |
| `Octopus.Action.Package.PackageVersion` | The version of the package being deployed. | `1.2.3` |
| `Octopus.Action.Package.SkipIfAlreadyInstalled` | Whether re-deployment is skipped when the package version is already on the machine. | `False` |
| `Octopus.Action.Script.ScriptBody` | The script being run in a script step. | `Write-Host 'Hello'` |
| `Octopus.Action.Script.Syntax` | The syntax of the script being run in a script step. | PowerShell |
| `Octopus.Action.Script.CSharp.NuGetSource` | The NuGet source used by the dotnet executor for C# script steps. | `https://my-nuget-server/nuget` |
| `Octopus.Action.SkipRemainingConventions` | Set as an output variable to finish the action without running further conventions or scripts. | `True` |
| `Octopus.Action.TargetRoles` | The machine target tags targeted by the action. | `web-server,frontend` |
| `Octopus.Action.Template.Id` | The ID of the step template the action is based on, if any. | `action-templates-123` |
| `Octopus.Action.Template.Version` | The version of the step template in use, if any. | `123` |
| `Octopus.Action.Status.Error` | A description of the error, if the action failed. | The server could not be contacted |
| `Octopus.Action.Status.ErrorDetail` | A full description of the error, if the action failed. | `System.Net.SocketException: The server could not be contacted` |
| `Octopus.Action.SubstituteInFiles.EnableNoMatchWarning` | Whether a warning is logged when no files match a glob pattern in Substitute Variables in Files. | `False` |

### Package reference variables

When you reference a package in a custom script, that package contributes its own variables, available per package. The examples below assume a package reference named `Acme`.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Action.Package[Acme].PackageId` | The package ID. | `Acme` |
| `Octopus.Action.Package[Acme].FeedId` | The feed ID. | `feeds-123` |
| `Octopus.Action.Package[Acme].PackageVersion` | The version of the package included in the release. | `1.4.0` |
| `Octopus.Action.Package[Acme].OriginalPath` | The location of the package file before any actions are taken. | `C:\Octopus\Packages\Spaces-1\feeds-builtin\Acme\Acme.1.4.0.zip` |
| `Octopus.Action.Package[Acme].ExtractedPath` | The absolute path to the extracted directory, if the package is extracted. | `C:\Octopus\Work\20210821060923-7117-31\Acme` |
| `Octopus.Action.Package[Acme].PackageFilePath` | The absolute path to the package file, if the package isn't extracted. | `C:\Octopus\Work\20210821060923-7117-31\Acme.zip` |
| `Octopus.Action.Package[Acme].PackageFileName` | The name of the package file, if the package isn't extracted. | `Acme.zip` |

### Docker image package variables

When the package reference is a Docker image, these additional variables are contributed.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Action.Package[Acme].Image` | The fully qualified image name. | `index.docker.io/Acme:1.4.0` |
| `Octopus.Action.Package[Acme].Registry` | The URI of the registry the image was acquired from. | `index.docker.io` |
| `Octopus.Action.Package[Acme].Version` | The version of the image included in the release. | `1.4.0` |
| `Octopus.Action.Package[Acme].Feed.UserName` | The username for the feed the image was acquired from, if the feed uses credentials. | Alice |
| `Octopus.Action.Package[Acme].Feed.Password` | The password for the feed the image was acquired from, if the feed uses credentials. | `Password01!` |

## Azure variables

These variables are available during Azure deployment actions.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Action.Azure.CertificateThumbprint` | The thumbprint of the X.509 certificate used to authenticate with the target Azure subscription. | `86B5C...96AC` |
| `Octopus.Action.Azure.PackageExtractionPath` | The temporary path Azure packages are extracted to during deployment, if set. | `Z:\Temp\packages\` |
| `Octopus.Action.Azure.SubscriptionId` | The Azure subscription ID targeted by the action. | `8affaa7d-3d74-427c-93c5-2d7f6a16e754` |
| `Octopus.Action.Azure.ResourceGroupDeploymentName` | Overrides the auto-generated resource group deployment name when deploying a resource group. | `my-resource-group-deployment-name` |

### Azure Cloud Service variables

| Variable | Description | Example |
| --- | --- | --- |
| <code>Octopus.Action.Azure<wbr>.CloudService<wbr>ConfigurationFileRelativePath</code> | The relative path to the `.cscfg` file, if set. Falls back to `ServiceConfiguration.{Environment}.cscfg` or `ServiceConfiguration.Cloud.cscfg`. | `ServiceConfiguration.Custom.cscfg` |
| `Octopus.Action.Azure.CloudServiceName` | The name of the cloud service targeted by the action. | `my-cloud-service-web` |
| <code>Octopus.Action.Azure<wbr>.CloudService<wbr>PackageExtractionDisabled</code> | Whether Octopus pushes the `.cspkg` file to Azure as-is without unpacking it. | `True` |
| `Octopus.Action.Azure.CloudServicePackagePath` | The path of the `.cspkg` file used by the action. | `Z:\Temp\packages\my-cloud-service-web.cspkg` |
| `Octopus.Action.Azure.LogExtractedCspkg` | Whether the contents of the extracted `.cspkg` are written to the log. | `True` |
| `Octopus.Action.Azure.Slot` | The slot of the cloud service targeted by the action. | Staging |
| `Octopus.Action.Azure.StorageAccountName` | The Azure storage account `.cspkg` files are uploaded to. | `my-storage-account` |
| `Octopus.Action.Azure.SwapIfPossible` | Whether the action attempts a VIP swap instead of deploying directly into the targeted slot. | `True` |
| `Octopus.Action.Azure.UploadedPackageUri` | The storage URI of the `.cspkg` file to be deployed. | `https://my-storage-account/container/my-cloudservice.web.cspkg` |
| `Octopus.Action.Azure.UseCurrentInstanceCount` | Whether the action keeps the current instance count rather than reverting to the `.cspkg` definition. | `True` |
| `Octopus.Action.Azure.DeploymentLabel` | The custom deployment label used for the Azure cloud service deployment, if set. | my custom label for build 3.x.x |

### Azure Web App variables

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Action.Azure.WebAppName` | The name of the web app targeted by the deployment. | `my-web-app` |
| `Octopus.Action.Azure.DeploymentSlot` | The name of the web app slot targeted by the deployment. | `staging` |
| `Octopus.Action.Azure.ResourceGroupName` | The name of the resource group targeted by the deployment. | `MyResourceGroup` |
| `Octopus.Action.Azure.RemoveAdditionalFiles` | Whether Web Deploy deletes files at the destination that aren't in the source package. | `True` |
| `Octopus.Action.Azure.PreserveAppData` | Whether Web Deploy skips delete operations in the `App_Data` directory. | `True` |
| `Octopus.Action.Azure.AppOffline` | Whether Web Deploy takes the app domain down by adding an `app_offline.html` file in the site root. | `True` |

## Output variables

Output variables are collected while a step runs and made available to later steps.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Action[name].Output.property` | The result of calling `Set-OctopusVariable` during an action, exposed for use in other actions. | `Octopus.Action[Website].Output.WarmUpResponseTime` |
| `Octopus.Action[name].Output.Manual.Notes` | Notes provided by the user who completed a manual step. | Signed off by Alice |
| `Octopus.Action[name].Output.Package.InstallationDirectoryPath` | The directory the package was installed to. | `C:\Octopus\Tentacle\Apps\Production\MyApp\1.2.3` |
| `Octopus.Action[name].Output[machine].Package.InstallationDirectoryPath` | The directory the package was installed to on a specific target machine. Use this to read the installation directory for a machine other than the one currently running, for example in a [run condition](/docs/projects/steps/conditions). | `C:\Octopus\Tentacle\Apps\Production\MyApp\1.2.3` |
| `Octopus.Action[name].Output.Manual.ResponsibleUser.DisplayName` | The full name of the user who completed the manual step. | Alice King |
| `Octopus.Action[name].Output.Manual.ResponsibleUser.EmailAddress` | The email address of the user who completed the manual step. | `alice@example.com` |
| `Octopus.Action[name].Output.Manual.ResponsibleUser.Id` | The ID of the user who completed the manual step. | `users-123` |
| `Octopus.Action[name].Output.Manual.ResponsibleUser.Username` | The username of the user who completed the manual step. | `alice` |
| <code>Octopus.Action[name]<wbr>.Output<wbr>.OctopusAzure<wbr>CloudServiceDeploymentID</code> | The ID of the completed Azure cloud service deployment. | `c9f52d...409f` |
| <code>Octopus.Action[name]<wbr>.Output<wbr>.OctopusAzure<wbr>CloudServiceDeploymentUrl</code> | The URL of the completed Azure cloud service deployment. | `http://c9f52d...409f.cloudapp.net/` |

## Step variables

Step-level variables are available while a step runs.

You can also read these variables for a different step using indexed notation, for example `Octopus.Step[StepName].Status.Code`. This is useful when [writing run conditions](/docs/projects/variables/system-variables/#tracking-deployment-status) that depend on another step's status.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Step.Id` | The ID of the step. | `80b3ad09-eedf-40d6-9b66-cf97f5c0ffee` |
| `Octopus.Step.Name` | The name of the step. | Website |
| `Octopus.Step.Number` | The number of the step. | `2` |
| `Octopus.Step.Status.Code` | A code describing the current status of the step. | `Succeeded` |
| `Octopus.Step.Status.Error` | A description of the error, if the step failed. | The server could not be contacted |
| `Octopus.Step.Status.ErrorDetail` | A full description of the error, if the step failed. | `System.Net.SocketException: The server could not be contacted` |

The status codes returned by `Octopus.Step.Status.Code` are `Pending`, `Skipped`, `Abandoned`, `Canceled`, `Running`, `Succeeded`, and `Failed`.

## Tracking deployment status {#tracking-deployment-status}

During a deployment or runbook run, Octopus provides variables describing the status of each step and action, including ones other than the one currently running. This lets you reference another step or action's outcome, for example when writing a [run condition](/docs/projects/steps/conditions).

Where `StepName` is the name of the step:

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Step[StepName].Status.Code` | A code describing the status of the step. | `Succeeded` |
| `Octopus.Step[StepName].Status.Error` | A description of the error, if the step failed. | The server could not be contacted |
| `Octopus.Step[StepName].Status.ErrorDetail` | A full description of the error, if the step failed. | `System.Net.SocketException: The server could not be contacted` |

Where `ActionName` is the name of the action:

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Action[ActionName].IsSkipped` | Whether the action was skipped in the current deployment. Can be `True` or empty. | `True` |
| `Octopus.Action[ActionName].TargetRoles` | The machine target tags targeted by the action. | `web-server,frontend` |

For the deployment as a whole, see `Octopus.Deployment.Error` and `Octopus.Deployment.ErrorDetail` in [Deployment variables](#deployment-variables). These only contain the exit code and Octopus stack trace for the error. Octopus can't parse the deployment log, so it can only extract exit and error codes, not detailed information on the cause of the failure. Check the logs for full details on why a deployment failed.

## Agent variables

Agent-level variables describe the deployment agent or Tentacle the deployment runs on.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Tentacle.Agent.ApplicationDirectoryPath` | The directory the agent installs packages under. | `C:\Octopus\Tentacle\Apps` |
| `Octopus.Tentacle.Agent.InstanceName` | The instance name the agent runs under. | `Tentacle` |
| `Octopus.Tentacle.Agent.ProgramDirectoryPath` | The directory containing the agent's own executables. | `C:\Program Files\Octopus Deploy\Tentacle` |
| `Octopus.Agent.ProgramDirectoryPath` | The directory containing the server's or Tentacle's executables, depending on where the step runs. | `C:\Program Files\Octopus Deploy\Octopus` |

## Worker pool variables

When a step runs on a worker, these variables are available.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.WorkerPool.Id` | The ID of the pool. | `WorkerPools-1` |
| `Octopus.WorkerPool.Name` | The name of the pool. | Default Worker Pool |

## Server variables

Server-level variables describe the Octopus Server the deployment runs on.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Web.BaseUrl` | The default URL the server API can be accessed at, based on the server's listen prefixes. May not be suitable behind a load balancer or reverse proxy. | `https://my-octopus` |
| `Octopus.Web.ServerUri` | The default URL the server portal can be accessed at, as configured in Configuration ➜ Nodes. | `https://my-octopus` |

## Runbook variables

These variables are available during a runbook run.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Runbook.Id` | The ID of the runbook. | `Runbooks-123` |
| `Octopus.Runbook.Name` | The name of the runbook. | Restore Database |
| `Octopus.RunbookRun.Created` | The date and time the runbook was run. | Friday, March 13, 2020 6:23:38 AM |
| `Octopus.RunbookRun.CreatedUtc` | The date and time the runbook was run, in UTC. | `3/13/20 6:23:38 AM +00:00` |
| `Octopus.RunbookRun.Git.BranchName` | The branch name, if the run was created from a branch. | `branch-abc` |
| `Octopus.RunbookRun.Git.CommitHash` | The commit hash used to create the run, for a version-controlled runbook. | `14677f...a1e9` |
| `Octopus.RunbookRun.Git.Ref` | The full git ref used to create the run, for a version-controlled runbook. | `refs/heads/branch-abc` |
| `Octopus.RunbookRun.Git.TagName` | The tag name, if the run was created for a tag. | `v1.0.234` |
| `Octopus.RunbookRun.Id` | The ID of the run. | `RunbookRuns-123` |
| `Octopus.RunbookRun.Name` | The name of the run. | Run on Production |
| `Octopus.RunbookSnapshot.Id` | The ID of the snapshot being run. | `RunbookSnapshots-123` |
| `Octopus.RunbookSnapshot.Name` | The name of the snapshot. | Snapshot EXAMPLE3 |
| `Octopus.RunbookSnapshot.Notes` | Notes associated with the snapshot, in Markdown. | Restores the database |
| `Octopus.Web.RunbookSnapshotLink` | A path relative to the Octopus Server URL where the runbook snapshot can be viewed. | `/app/snapshots/runbookSnapshots-123` |
| `Octopus.Web.RunbookRunLink` | A path relative to the Octopus Server URL where the runbook run can be viewed. | `/app/runs/runbookRuns-123` |

## Kubernetes variables

This variable controls Kubernetes CLI output during Kubernetes deployment actions.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Action.Kubernetes.LogCliOutputAsInfo` | Whether successful output from Kubernetes CLI tools (`kubectl`, `helm`, `aws`, `az`, `gcloud`) is logged at the Info level instead of Verbose. | `True` |

## User-modifiable settings

You define these variables in your project to change how Octopus behaves. Unlike the variables above, you set these values and Octopus reads them.

| Variable | Description | Example |
| --- | --- | --- |
| `Octopus.Acquire.MaxParallelism` | The maximum number of NuGet packages downloaded at once when acquiring packages. | `3` |
| `Octopus.Action.MaxParallelism` | The maximum number of targets an action runs on concurrently, and the maximum number of steps that run in parallel. Default: 10. | `5` |
| `OctopusPrintVariables` | Set to `True` to have Tentacle print the value of all variables passed to it. | `True` |
| `OctopusPrintEvaluatedVariables` | Set to `True` to have Tentacle print the value of all variables passed to it after evaluation. | `True` |
| `OctopusSkipFreeDiskSpaceCheck` | Set to `True` to skip the free disk space check when deploying packages. | `True` |
| `OctopusFreeDiskSpaceOverrideInMegaBytes` | The amount of free disk space, in megabytes, to check for, overriding the 500 MB default. | `100` |
| <code>OctopusShouldFailDeployment<wbr>OnSubstitutionFails</code> | Set to `True` to fail the deployment if any variable substitution fails. | `True` |
| `Octopus.Action.PowerShell.CustomPowerShellVersion` | The version Windows PowerShell scripts are invoked with (2.0, 3.0, 4.0, 5.0). For PowerShell Core, the value must match a directory in `%PROGRAMFILES%\PowerShell`. | `2.0` |
| `OctopusDeleteScriptsOnCleanup` | Set to `False` to keep packaged PreDeploy, Deploy, and PostDeploy scripts in the target directory. | `False` |
| `Octopus.Action.Script.SuppressEnvironmentLogging` | Set to `True` to suppress script environment-variable logging. | `True` |
| `Octopus.Action.PowerShell.ExecuteWithoutProfile` | Set to `True` to skip the Tentacle service account's PowerShell profile when running PowerShell steps. | `True` |
| <code>OctopusSuppressDuplicate<wbr>VariableWarning</code> | Set to `True` to log the duplicate-variable message as verbose instead of a warning. | `True` |
| `Octopus.Action.Package.RunScripts` | Set to `False` to prevent scripts inside packages from running. | `True` |
| `Octopus.Calamari.CopyWorkingDirectoryIncludingKeyTo` | A file path the Calamari working directory is copied to, including the one-time key used to decrypt sensitive variables. | `c:\temp\octopus-debug` |
| `Octopus.Deployment.WorkerLeaseCap` | An opt-in cap on how many steps referencing the same package reuse a single worker. Disabled by default; set above zero to opt in. Applies to deployments and runbooks. | `5` |
| `Octopus.Task.ConcurrencyTag` | Runs one task at a time per concurrency tag. Set to run tasks in parallel instead of serial, or in serial instead of parallel. | `#{Octopus.Deployment.Tenant.Id}/#{Octopus.Project.Id}/#{Octopus.Environment.Id}` |

## Version notes

Some variables are available only from a specific version of Octopus. This topic lists those variables and the version each became available in.

| Variable | Available from |
| --- | --- |
| `Octopus.Release.Git.BranchName`, `Octopus.Release.Git.CommitHash`, `Octopus.Release.Git.Ref` | Octopus 2021.3 |
| `Octopus.Web.ServerUri` | Octopus 2019.4.0 |
| `Octopus.Deployment.Tenant.Id`, `Octopus.Deployment.Tenant.Name`, `Octopus.Deployment.Tenant.Tags` | Octopus 3.4 |
| `OctopusShouldFailDeploymentOnSubstitutionFails` | Octopus 2025.1.0 |

## Related links

- [Variable substitution syntax](/docs/projects/variables/variable-substitutions/)
- [Variable filters](/docs/projects/variables/variable-filters/)
- [Custom scripts](/docs/deployments/custom-scripts)