Predefined build variables

07/20/2018
59 minutes to read
Contributors

Azure Pipelines | TFS 2018 | TFS 2017 | TFS 2015

Note

Some features and predefined variables are not available in certain versions of TFS. We're working on updating this topic to call out these differences.

Note

In Microsoft Team Foundation Server (TFS) 2018 and previous versions, build and release pipelines are called definitions, service connections are called service endpoints, stages are called environments, and jobs are called phases.

Variables give you a convenient way to get key bits of data into various parts of your build pipeline. This is the comprehensive list of predefined build variables.

These variables are automatically set by the system and read-only. (The exceptions are Build.Clean and System.Debug.) Learn more about working with variables.

Build.Clean

This is a deprecated variable that modifies how the build agent cleans up source. To learn how to clean up source, see source repositories.

This variable modifies how the build agent cleans up source. To learn more, see source repositories.

System.AccessToken

System.AccessToken is a special variable that carries the security token used by the running build.

YAML
Designer

In YAML, you must explicitly map System.AccessToken into the pipeline using a variable. You can do this at the step or task level:

steps:
  - bash: echo This is a script that could use $SYSTEM_ACCESSTOKEN
    env:
      SYSTEM_ACCESSTOKEN: $(System.AccessToken)
  - powershell: Write-Host "This is a script that could use $env:SYSTEM_ACCESSTOKEN"
    env:
      SYSTEM_ACCESSTOKEN: $(System.AccessToken)

System.Debug

For more detailed logs to debug pipeline problems, define System.Debug and set it to true.

Agent variables

Note

You can use agent variables as environment variables in your scripts and as parameters in your build tasks. You cannot use them to customize the build number or to apply a version control label or tag.

Variable	Description
Agent.BuildDirectory	The local path on the agent where all folders for a given build pipeline are created. For example: `c:\agent_work\1`
Agent.HomeDirectory	The directory the agent is installed into. This contains the agent software. For example: `c:\agent`.
Agent.Id	The ID of the agent.
Agent.JobName	The display name of the running job.
Agent.JobStatus	The status of the build. `Canceled` `Failed` `Succeeded` `SucceededWithIssues` (partially successful) The environment variable should be referenced as `AGENT_JOBSTATUS`. The older `agent.jobstatus` is available for backwards compatibility.
Agent.MachineName	The name of the machine on which the agent is installed.
Agent.Name	The name of the agent that is registered with the pool. If you are using a self-hosted agent, then this name is specified by you. See agents.
Agent.OS	The operating system of the agent host. Valid values are: Windows_NT Darwin Linux If you're running in a container, the agent host and container may be running different operating systems.
Agent.OSArchitecture	The operating system processor architecture of the agent host. Valid values are: X86 X64 ARM
Agent.ToolsDirectory	The directory used by tasks such as Node Tool Installer and Use Python Version to switch between multiple versions of a tool. These tasks will add tools from this directory to `PATH` so that subsequent build steps can use them. Learn about managing this directory on a self-hosted agent.
Agent.WorkFolder	The working directory for this agent. For example: `c:\agent\_work`.

Build variables

Variable	Description
Build.ArtifactStagingDirectory	The local path on the agent where any artifacts are copied to before being pushed to their destination. For example: `c:\agent\_work\1\a` A typical way to use this folder is to publish your build artifacts with the Copy files and Publish build artifacts tasks. Note: Build.ArtifactStagingDirectory and Build.StagingDirectory are interchangeable. This directory is purged before each new build, so you don't have to clean it up yourself. See Artifacts in Azure Pipelines. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.BuildId	The ID of the record for the completed build.
Build.BuildNumber	The name of the completed build. You can specify the build number format that generates this value in the pipeline options. A typical use of this variable is to make it part of the label format, which you specify on the repository tab. Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.BuildUri	The URI for the build. For example: `vstfs:///Build/Build/1430`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.BinariesDirectory	The local path on the agent you can use as an output folder for compiled binaries. By default, new build pipelines are not set up to clean this directory. You can define your build to clean it up on the Repository tab. For example: `c:\agent\_work\1\b`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.DefinitionName	The name of the build pipeline. Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.DefinitionVersion	The version of the build pipeline.
Build.QueuedBy	See "How are the identity variables set?". Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.QueuedById	See "How are the identity variables set?".
Build.Reason	The event that caused the build to run. `Manual`: A user manually queued the build. `IndividualCI`: Continuous integration (CI) triggered by a Git push or a TFVC check-in. `BatchedCI`: Continuous integration (CI) triggered by a Git push or a TFVC check-in, and the Batch changes was selected. `Schedule`: Scheduled trigger. `ValidateShelveset`: A user manually queued the build of a specific TFVC shelveset. `CheckInShelveset`: Gated check-in trigger. `PullRequest`: The build was triggered by a Git branch policy that requires a build. `BuildCompletion`: The build was triggered by another build See Build pipeline triggers, Improve code quality with branch policies.
Build.Repository.Clean	The value you've selected for Clean in the source repository settings. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.LocalPath	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag. This variable is synonymous with Build.SourcesDirectory.
Build.Repository.Name	The name of the repository. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Provider	The type of repository you selected. `TfsGit`: TFS Git repository `TfsVersionControl`: Team Foundation Version Control `Git`: Git repository hosted on an external server `GitHub` `Svn`: Subversion This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Tfvc.Workspace	Defined if your repository is Team Foundation Version Control. The name of the TFVC workspace used by the build agent. For example, if the Agent.BuildDirectory is `c:\agent\_work\12` and the Agent.Id is `8`, the workspace name could be: `ws_12_8` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Uri	The URL for the repository. For example: Git: `https://dev.azure.com/fabrikamfiber/_git/Scripts` TFVC: `https://dev.azure.com/fabrikamfiber/` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.RequestedFor	See "How are the identity variables set?". Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.RequestedForEmail	See "How are the identity variables set?".
Build.RequestedForId	See "How are the identity variables set?".
Build.SourceBranch	The branch the build was queued for. Some examples: Git repo branch: `refs/heads/master` Git repo pull request: `refs/pull/1/merge` TFVC repo branch: `$/teamproject/main` TFVC repo gated check-in: `Gated_2016-06-06_05.20.51.4369;username@live.com` TFVC repo shelveset build: `myshelveset;username@live.com` When you use this variable in your build number format, the forward slash characters (`/`) are replaced with underscore characters `_`). Note: In TFVC, if you are running a gated check-in build or manually building a shelveset, you cannot use this variable in your build number format.
Build.SourceBranchName	The name of the branch the build was queued for. Git repo branch or pull request: The last path segment in the ref. For example, in `refs/heads/master` this value is `master`. TFVC repo branch: The last path segment in the root server path for the workspace. For example in `$/teamproject/main` this value is `main`. TFVC repo gated check-in or shelveset build is the name of the shelveset. For example, `Gated_2016-06-06_05.20.51.4369;username@live.com` or `myshelveset;username@live.com`. Note: In TFVC, if you are running a gated check-in build or manually building a shelveset, you cannot use this variable in your build number format.
Build.SourcesDirectory	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag. This variable is synonymous with Build.Repository.LocalPath.
Build.SourceVersion	The latest version control change that is included in this build. Git: The commit ID. TFVC: the changeset. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.SourceVersionMessage	The comment of the commit or changeset. Note: This variable is available in TFS 2015.4.
Build.StagingDirectory	The local path on the agent where any artifacts are copied to before being pushed to their destination. For example: `c:\agent\_work\1\a` A typical way to use this folder is to publish your build artifacts with the Copy files and Publish build artifacts tasks. Note: Build.ArtifactStagingDirectory and Build.StagingDirectory are interchangeable. This directory is purged before each new build, so you don't have to clean it up yourself. See Artifacts in Azure Pipelines. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Git.SubmoduleCheckout	The value you've selected for Checkout submodules on the repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.SourceTfvcShelveset	Defined if your repository is Team Foundation Version Control. If you are running a gated build or a shelveset build, this is set to the name of the shelveset you are building. Note: This variable yields a value that is invalid for build use in a build number format.
Build.TriggeredBy.BuildId	If the build was triggered by another build, then this variable is set to the BuildID of the triggering build. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.TriggeredBy.DefinitionId	If the build was triggered by another build, then this variable is set to the DefinitionID of the triggering build. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.TriggeredBy.DefinitionName	If the build was triggered by another build, then this variable is set to the name of the triggering build pipeline. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.TriggeredBy.BuildNumber	If the build was triggered by another build, then this variable is set to the number of the triggering build. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.TriggeredBy.ProjectID	If the build was triggered by another build, then this variable is set to ID of the project that contains the triggering build. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Common.TestResultsDirectory	The local path on the agent where the test results are created. For example: `c:\agent\_work\1\TestResults` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.

System variables

Variable	Description
System.AccessToken	Use the OAuth token to access the REST API. Use System.AccessToken from YAML scripts. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.CollectionId	The GUID of the TFS collection or Azure DevOps organization
System.DefaultWorkingDirectory	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.DefinitionId	The ID of the build pipeline.
System.HostType	Set to `build` if the pipeline is a build. For a release, the values are `deployment` for a Deployment group job and `release` for an Agent job.
System.PullRequest.IsFork	If the pull request is from a fork of the repository, this variable is set to `True`. Otherwise, it is set to `False`.
System.PullRequest.PullRequestId	The ID of the pull request that caused this build. For example: `17`. (This variable is initialized only if the build ran because of a Git PR affected by a branch policy.)
System.PullRequest.PullRequestNumber	The number of the pull request that caused this build. This variable is populated for pull requests from GitHub which have a different pull request ID and pull request number.
System.PullRequest.SourceBranch	The branch that is being reviewed in a pull request. For example: `refs/heads/users/raisa/new-feature`. (This variable is initialized only if the build ran because of a Git PR affected by a branch policy.)
System.PullRequest.SourceRepositoryURI	The URL to the repo that contains the pull request. For example: `https://dev.azure.com/ouraccount/_git/OurProject`. (This variable is initialized only if the build ran because of a Azure Repos Git PR affected by a branch policy. It is not initialized for GitHub PRs.)
System.PullRequest.TargetBranch	The branch that is the target of a pull request. For example: `refs/heads/master`. This variable is initialized only if the build ran because of a Git PR affected by a branch policy.
System.TeamFoundationCollectionUri	The URI of the team foundation collection. For example: `https://dev.azure.com/fabrikamfiber/`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.TeamProject	The name of the project that contains this build.
System.TeamProjectId	The ID of the project that this build belongs to.
TF_BUILD	Set to `True` if the script is being run by a build task. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.

Agent variables

Note

Variable	Description
Agent.BuildDirectory	The local path on the agent where all folders for a given build pipeline are created. For example: `c:\agent_work\1`
Agent.HomeDirectory	The directory the agent is installed into. This contains the agent software. For example: `c:\agent`.
Agent.Id	The ID of the agent.
Agent.JobName	The display name of the running job.
Agent.JobStatus	The status of the build. `Canceled` `Failed` `Succeeded` `SucceededWithIssues` (partially successful) The environment variable should be referenced as `AGENT_JOBSTATUS`. The older `agent.jobstatus` is available for backwards compatibility.
Agent.MachineName	The name of the machine on which the agent is installed.
Agent.Name	The name of the agent that is registered with the pool. If you are using a self-hosted agent, then this name is specified by you. See agents.
Agent.OS	The operating system of the agent host. Valid values are: Windows_NT Darwin Linux If you're running in a container, the agent host and container may be running different operating systems.
Agent.OSArchitecture	The operating system processor architecture of the agent host. Valid values are: X86 X64 ARM
Agent.ToolsDirectory	The directory used by tasks such as Node Tool Installer and Use Python Version to switch between multiple versions of a tool. These tasks will add tools from this directory to `PATH` so that subsequent build steps can use them. Learn about managing this directory on a self-hosted agent.
Agent.WorkFolder	The working directory for this agent. For example: `c:\agent\_work`.

Build variables

Variable	Description
Build.ArtifactStagingDirectory	The local path on the agent where any artifacts are copied to before being pushed to their destination. For example: `c:\agent\_work\1\a` A typical way to use this folder is to publish your build artifacts with the Copy files and Publish build artifacts tasks. Note: Build.ArtifactStagingDirectory and Build.StagingDirectory are interchangeable. This directory is purged before each new build, so you don't have to clean it up yourself. See Artifacts in Azure Pipelines. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.BuildId	The ID of the record for the completed build.
Build.BuildNumber	The name of the completed build. You can specify the build number format that generates this value in the pipeline options. A typical use of this variable is to make it part of the label format, which you specify on the repository tab. Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.BuildUri	The URI for the build. For example: `vstfs:///Build/Build/1430`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.BinariesDirectory	The local path on the agent you can use as an output folder for compiled binaries. By default, new build pipelines are not set up to clean this directory. You can define your build to clean it up on the Repository tab. For example: `c:\agent\_work\1\b`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.DefinitionName	The name of the build pipeline. Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.DefinitionVersion	The version of the build pipeline.
Build.QueuedBy	See "How are the identity variables set?". Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.QueuedById	See "How are the identity variables set?".
Build.Reason	The event that caused the build to run. `Manual`: A user manually queued the build. `IndividualCI`: Continuous integration (CI) triggered by a Git push or a TFVC check-in. `BatchedCI`: Continuous integration (CI) triggered by a Git push or a TFVC check-in, and the Batch changes was selected. `Schedule`: Scheduled trigger. `ValidateShelveset`: A user manually queued the build of a specific TFVC shelveset. `CheckInShelveset`: Gated check-in trigger. `PullRequest`: The build was triggered by a Git branch policy that requires a build. `BuildCompletion`: The build was triggered by another build See Build pipeline triggers, Improve code quality with branch policies.
Build.Repository.Clean	The value you've selected for Clean in the source repository settings. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.LocalPath	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag. This variable is synonymous with Build.SourcesDirectory.
Build.Repository.Name	The name of the repository. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Provider	The type of repository you selected. `TfsGit`: TFS Git repository `TfsVersionControl`: Team Foundation Version Control `Git`: Git repository hosted on an external server `GitHub` `Svn`: Subversion This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Tfvc.Workspace	Defined if your repository is Team Foundation Version Control. The name of the TFVC workspace used by the build agent. For example, if the Agent.BuildDirectory is `c:\agent\_work\12` and the Agent.Id is `8`, the workspace name could be: `ws_12_8` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Uri	The URL for the repository. For example: Git: `https://dev.azure.com/fabrikamfiber/_git/Scripts` TFVC: `https://dev.azure.com/fabrikamfiber/` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.RequestedFor	See "How are the identity variables set?". Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.RequestedForEmail	See "How are the identity variables set?".
Build.RequestedForId	See "How are the identity variables set?".
Build.SourceBranch	The branch the build was queued for. Some examples: Git repo branch: `refs/heads/master` Git repo pull request: `refs/pull/1/merge` TFVC repo branch: `$/teamproject/main` TFVC repo gated check-in: `Gated_2016-06-06_05.20.51.4369;username@live.com` TFVC repo shelveset build: `myshelveset;username@live.com` When you use this variable in your build number format, the forward slash characters (`/`) are replaced with underscore characters `_`). Note: In TFVC, if you are running a gated check-in build or manually building a shelveset, you cannot use this variable in your build number format.
Build.SourceBranchName	The name of the branch the build was queued for. Git repo branch or pull request: The last path segment in the ref. For example, in `refs/heads/master` this value is `master`. TFVC repo branch: The last path segment in the root server path for the workspace. For example in `$/teamproject/main` this value is `main`. TFVC repo gated check-in or shelveset build is the name of the shelveset. For example, `Gated_2016-06-06_05.20.51.4369;username@live.com` or `myshelveset;username@live.com`. Note: In TFVC, if you are running a gated check-in build or manually building a shelveset, you cannot use this variable in your build number format.
Build.SourcesDirectory	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag. This variable is synonymous with Build.Repository.LocalPath.
Build.SourceVersion	The latest version control change that is included in this build. Git: The commit ID. TFVC: the changeset. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.SourceVersionMessage	The comment of the commit or changeset. Note: This variable is available in TFS 2015.4.
Build.StagingDirectory	The local path on the agent where any artifacts are copied to before being pushed to their destination. For example: `c:\agent\_work\1\a` A typical way to use this folder is to publish your build artifacts with the Copy files and Publish build artifacts tasks. Note: Build.ArtifactStagingDirectory and Build.StagingDirectory are interchangeable. This directory is purged before each new build, so you don't have to clean it up yourself. See Artifacts in Azure Pipelines. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Git.SubmoduleCheckout	The value you've selected for Checkout submodules on the repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.SourceTfvcShelveset	Defined if your repository is Team Foundation Version Control. If you are running a gated build or a shelveset build, this is set to the name of the shelveset you are building. Note: This variable yields a value that is invalid for build use in a build number format.
Build.TriggeredBy.BuildId	If the build was triggered by another build, then this variable is set to the BuildID of the triggering build. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.TriggeredBy.DefinitionId	If the build was triggered by another build, then this variable is set to the DefinitionID of the triggering build. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.TriggeredBy.DefinitionName	If the build was triggered by another build, then this variable is set to the name of the triggering build pipeline. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.TriggeredBy.BuildNumber	If the build was triggered by another build, then this variable is set to the number of the triggering build. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.TriggeredBy.ProjectID	If the build was triggered by another build, then this variable is set to ID of the project that contains the triggering build. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Common.TestResultsDirectory	The local path on the agent where the test results are created. For example: `c:\agent\_work\1\TestResults` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.

System variables

Variable	Description
System.AccessToken	Use the OAuth token to access the REST API. Use System.AccessToken from YAML scripts. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.CollectionId	The GUID of the TFS collection or Azure DevOps organization
System.DefaultWorkingDirectory	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.DefinitionId	The ID of the build pipeline.
System.HostType	Set to `build` if the pipeline is a build. For a release, the values are `deployment` for a Deployment group job and `release` for an Agent job.
System.PullRequest.IsFork	If the pull request is from a fork of the repository, this variable is set to `True`. Otherwise, it is set to `False`.
System.PullRequest.PullRequestId	The ID of the pull request that caused this build. For example: `17`. (This variable is initialized only if the build ran because of a Git PR affected by a branch policy.)
System.PullRequest.PullRequestNumber	The number of the pull request that caused this build. This variable is populated for pull requests from GitHub which have a different pull request ID and pull request number.
System.PullRequest.SourceBranch	The branch that is being reviewed in a pull request. For example: `refs/heads/users/raisa/new-feature`. (This variable is initialized only if the build ran because of a Git PR affected by a branch policy.)
System.PullRequest.SourceRepositoryURI	The URL to the repo that contains the pull request. For example: `https://dev.azure.com/ouraccount/_git/OurProject`. (This variable is initialized only if the build ran because of a Azure Repos Git PR affected by a branch policy. It is not initialized for GitHub PRs.)
System.PullRequest.TargetBranch	The branch that is the target of a pull request. For example: `refs/heads/master`. This variable is initialized only if the build ran because of a Git PR affected by a branch policy.
System.TeamFoundationCollectionUri	The URI of the team foundation collection. For example: `https://dev.azure.com/fabrikamfiber/`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.TeamProject	The name of the project that contains this build.
System.TeamProjectId	The ID of the project that this build belongs to.
TF_BUILD	Set to `True` if the script is being run by a build task. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.

Agent variables

Note

Variable	Description
Agent.BuildDirectory	The local path on the agent where all folders for a given build pipeline are created. For example: `c:\agent_work\1`
Agent.HomeDirectory	The directory the agent is installed into. This contains the agent software. For example: `c:\agent`.
Agent.Id	The ID of the agent.
Agent.JobStatus	The status of the build. `Canceled` `Failed` `Succeeded` `SucceededWithIssues` (partially successful) The environment variable should be referenced as `AGENT_JOBSTATUS`. The older `agent.jobstatus` is available for backwards compatibility.
Agent.MachineName	The name of the machine on which the agent is installed.
Agent.Name	The name of the agent that is registered with the pool. This name is specified by you. See agents.
Agent.ToolsDirectory	The directory used by tasks such as Node Tool Installer and Use Python Version to switch between multiple versions of a tool. These tasks will add tools from this directory to `PATH` so that subsequent build steps can use them. Learn about managing this directory on a self-hosted agent.
Agent.WorkFolder	The working directory for this agent. For example: `c:\agent\_work`.

Build variables

Variable	Description
Build.ArtifactStagingDirectory	The local path on the agent where any artifacts are copied to before being pushed to their destination. The local path on the agent where any artifacts are copied to before being pushed to their destination. For example: `c:\agent\_work\1\a` A typical way to use this folder is to publish your build artifacts with the Copy files and Publish build artifacts tasks. Note: Build.ArtifactStagingDirectory and Build.StagingDirectory are interchangeable. This directory is purged before each new build, so you don't have to clean it up yourself. See Artifacts in Azure Pipelines. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.BuildId	The ID of the record for the completed build.
Build.BuildNumber	The name of the completed build. You can specify the build number format that generates this value in the pipeline options. A typical use of this variable is to make it part of the label format, which you specify on the repository tab. Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as a version control tag.
Build.BuildUri	The URI for the build. For example: `vstfs:///Build/Build/1430`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.BinariesDirectory	The local path on the agent you can use as an output folder for compiled binaries. By default, new build pipelines are not set up to clean this directory. You can define your build to clean it up on the Repository tab. For example: `c:\agent\_work\1\b`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.DefinitionName	The name of the build pipeline. Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.DefinitionVersion	The version of the build pipeline.
Build.QueuedBy	See "How are the identity variables set?". Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.QueuedById	See "How are the identity variables set?".
Build.Reason	The event that caused the build to run. `Manual`: A user manually queued the build. `IndividualCI`: Continuous integration (CI) triggered by a Git push or a TFVC check-in. `BatchedCI`: Continuous integration (CI) triggered by a Git push or a TFVC check-in, and the Batch changes was selected. `Schedule`: Scheduled trigger. `ValidateShelveset`: A user manually queued the build of a specific TFVC shelveset. `CheckInShelveset`: Gated check-in trigger. `PullRequest`: The build was triggered by a Git branch policy that requires a build. See Build pipeline triggers, Improve code quality with branch policies.
Build.Repository.Clean	The value you've selected for Clean in the source repository settings. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.LocalPath	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag. This variable is synonymous with Build.SourcesDirectory.
Build.Repository.Name	The name of the repository. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Provider	The type of repository you selected. `TfsGit`: TFS Git repository `TfsVersionControl`: Team Foundation Version Control `Git`: Git repository hosted on an external server `Svn`: Subversion This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Tfvc.Workspace	Defined if your repository is Team Foundation Version Control. The name of the TFVC workspace used by the build agent. For example, if the Agent.BuildDirectory is `c:\agent\_work\12` and the Agent.Id is `8`, the workspace name could be: `ws_12_8` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Uri	The URL for the repository. For example: Git: `https://fabrikamfiber/tfs/DefaultCollection/Scripts/_git/Scripts` TFVC: `https://fabrikamfiber/tfs/DefaultCollection/` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.RequestedFor	See "How are the identity variables set?". Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.RequestedForEmail	See "How are the identity variables set?".
Build.RequestedForId	See "How are the identity variables set?".
Build.SourceBranch	The branch the build was queued for. Some examples: Git repo branch: `refs/heads/master` Git repo pull request: `refs/pull/1/merge` TFVC repo branch: `$/teamproject/main` TFVC repo gated check-in: `Gated_2016-06-06_05.20.51.4369;username@live.com` TFVC repo shelveset build: `myshelveset;username@live.com` When you use this variable in your build number format, the forward slash characters (`/`) are replaced with underscore characters `_`). Note: In TFVC, if you are running a gated check-in build or manually building a shelveset, you cannot use this variable in your build number format.
Build.SourceBranchName	The name of the branch the build was queued for. Git repo branch or pull request: The last path segment in the ref. For example, in `refs/heads/master` this value is `master`. TFVC repo branch: The last path segment in the root server path for the workspace. For example in `$/teamproject/main` this value is `main`. TFVC repo gated check-in or shelveset build is the name of the shelveset. For example, `Gated_2016-06-06_05.20.51.4369;username@live.com` or `myshelveset;username@live.com`. Note: In TFVC, if you are running a gated check-in build or manually building a shelveset, you cannot use this variable in your build number format.
Build.SourcesDirectory	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag. This variable is synonymous with Build.Repository.LocalPath.
Build.SourceVersion	The latest version control change that is included in this build. Git: The commit ID. TFVC: the changeset. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.SourceVersionMessage	The comment of the commit or changeset. Note: This variable is available in TFS 2015.4.
Build.StagingDirectory	The local path on the agent where any artifacts are copied to before being pushed to their destination. For example: `c:\agent\_work\1\a` A typical way to use this folder is to publish your build artifacts with the Copy files and Publish build artifacts tasks. Note: Build.ArtifactStagingDirectory and Build.StagingDirectory are interchangeable. This directory is purged before each new build, so you don't have to clean it up yourself. See Artifacts in Azure Pipelines. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Git.SubmoduleCheckout	The value you've selected for Checkout submodules on the repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.SourceTfvcShelveset	Defined if your repository is Team Foundation Version Control. If you are running a gated build or a shelveset build, this is set to the name of the shelveset you are building. Note: This variable yields a value that is invalid for build use in a build number format.
Common.TestResultsDirectory	The local path on the agent where the test results are created. For example: `c:\agent\_work\1\TestResults` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.

System variables

Variable	Description
System.AccessToken	Use the OAuth token to access the REST API. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.CollectionId	The GUID of the TFS collection or Azure DevOps organization
System.DefaultWorkingDirectory	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.DefinitionId	The ID of the build pipeline.
System.HostType	Set to `build` if the pipeline is a build or `release` if the pipeline is a release.
System.PullRequest.IsFork	If the pull request is from a fork of the repository, this variable is set to `True`. Otherwise, it is set to `False`. Available in TFS 2018.2.
System.PullRequest.PullRequestId	The ID of the pull request that caused this build. For example: `17`. (This variable is initialized only if the build ran because of a Git PR affected by a branch policy.)
System.PullRequest.SourceBranch	The branch that is being reviewed in a pull request. For example: `refs/heads/users/raisa/new-feature`. (This variable is initialized only if the build ran because of a Git PR affected by a branch policy.)
System.PullRequest.SourceRepositoryURI	The URL to the repo that contains the pull request. For example: `http://our-server:8080/tfs/DefaultCollection/_git/OurProject`. (This variable is initialized only if the build ran because of a Azure Repos Git PR affected by a branch policy.)
System.PullRequest.TargetBranch	The branch that is the target of a pull request. For example: `refs/heads/master`. This variable is initialized only if the build ran because of a Git PR affected by a branch policy.
System.TeamFoundationCollectionUri	The URI of the team foundation collection. For example: `http://our-server:8080/tfs/DefaultCollection/`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.TeamProject	The name of the project that contains this build.
System.TeamProjectId	The ID of the project that this build belongs to.
TF_BUILD	Set to `True` if the script is being run by a build task. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.

Agent variables

Note

Variable	Description
Agent.BuildDirectory	The local path on the agent where all folders for a given build pipeline are created. For example: `c:\agent_work\1`
Agent.ComputerName	The name of the machine on which the agent is installed.
Agent.HomeDirectory	The directory the agent is installed into. This contains the agent software. For example: `c:\agent`.
Agent.Id	The ID of the agent.
Agent.JobStatus	The status of the build. `Canceled` `Failed` `Succeeded` `SucceededWithIssues` (partially successful) The environment variable should be referenced as `AGENT_JOBSTATUS`. The older `agent.jobstatus` is available for backwards compatibility.
Agent.Name	The name of the agent that is registered with the pool. This name is specified by you. See agents.
Agent.WorkFolder	The working directory for this agent. For example: `c:\agent\_work`.

Build variables

Variable	Description
Build.ArtifactStagingDirectory	The local path on the agent where any artifacts are copied to before being pushed to their destination. The local path on the agent where any artifacts are copied to before being pushed to their destination. For example: `c:\agent\_work\1\a` A typical way to use this folder is to publish your build artifacts with the Copy files and Publish build artifacts tasks. Note: Build.ArtifactStagingDirectory and Build.StagingDirectory are interchangeable. This directory is purged before each new build, so you don't have to clean it up yourself. See Artifacts in Azure Pipelines. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.BuildId	The ID of the record for the completed build.
Build.BuildNumber	The name of the completed build. You can specify the build number format that generates this value in the pipeline options. A typical use of this variable is to make it part of the label format, which you specify on the repository tab. Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as a version control tag.
Build.BuildUri	The URI for the build. For example: `vstfs:///Build/Build/1430`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.BinariesDirectory	The local path on the agent you can use as an output folder for compiled binaries. By default, new build pipelines are not set up to clean this directory. You can define your build to clean it up on the Repository tab. For example: `c:\agent\_work\1\b`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.DefinitionName	The name of the build pipeline. Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.DefinitionVersion	The version of the build pipeline.
Build.QueuedBy	See "How are the identity variables set?". Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.QueuedById	See "How are the identity variables set?".
Build.Reason	The event that caused the build to run. Available in TFS 2017.3. `Manual`: A user manually queued the build. `IndividualCI`: Continuous integration (CI) triggered by a Git push or a TFVC check-in. `BatchedCI`: Continuous integration (CI) triggered by a Git push or a TFVC check-in, and the Batch changes was selected. `Schedule`: Scheduled trigger. `ValidateShelveset`: A user manually queued the build of a specific TFVC shelveset. `CheckInShelveset`: Gated check-in trigger. `PullRequest`: The build was triggered by a Git branch policy that requires a build. See Build pipeline triggers, Improve code quality with branch policies.
Build.Repository.Clean	The value you've selected for Clean in the source repository settings. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.LocalPath	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag. This variable is synonymous with Build.SourcesDirectory.
Build.Repository.Name	The name of the repository. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Provider	The type of repository you selected. `TfsGit`: TFS Git repository `TfsVersionControl`: Team Foundation Version Control `Git`: Git repository hosted on an external server `Svn`: Subversion This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Tfvc.Workspace	Defined if your repository is Team Foundation Version Control. The name of the TFVC workspace used by the build agent. For example, if the Agent.BuildDirectory is `c:\agent\_work\12` and the Agent.Id is `8`, the workspace name could be: `ws_12_8` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Uri	The URL for the repository. For example: Git: `https://fabrikamfiber/tfs/DefaultCollection/Scripts/_git/Scripts` TFVC: `https://fabrikamfiber/tfs/DefaultCollection/` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.RequestedFor	See "How are the identity variables set?". Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.RequestedForEmail	See "How are the identity variables set?".
Build.RequestedForId	See "How are the identity variables set?".
Build.SourceBranch	The branch the build was queued for. Some examples: Git repo branch: `refs/heads/master` Git repo pull request: `refs/pull/1/merge` TFVC repo branch: `$/teamproject/main` TFVC repo gated check-in: `Gated_2016-06-06_05.20.51.4369;username@live.com` TFVC repo shelveset build: `myshelveset;username@live.com` When you use this variable in your build number format, the forward slash characters (`/`) are replaced with underscore characters `_`). Note: In TFVC, if you are running a gated check-in build or manually building a shelveset, you cannot use this variable in your build number format.
Build.SourceBranchName	The name of the branch the build was queued for. Git repo branch or pull request: The last path segment in the ref. For example, in `refs/heads/master` this value is `master`. TFVC repo branch: The last path segment in the root server path for the workspace. For example in `$/teamproject/main` this value is `main`. TFVC repo gated check-in or shelveset build is the name of the shelveset. For example, `Gated_2016-06-06_05.20.51.4369;username@live.com` or `myshelveset;username@live.com`. Note: In TFVC, if you are running a gated check-in build or manually building a shelveset, you cannot use this variable in your build number format.
Build.SourcesDirectory	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag. This variable is synonymous with Build.Repository.LocalPath.
Build.SourceVersion	The latest version control change that is included in this build. Git: The commit ID. TFVC: the changeset. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.SourceVersionMessage	The comment of the commit or changeset. Note: This variable is available in TFS 2015.4.
Build.StagingDirectory	The local path on the agent where any artifacts are copied to before being pushed to their destination. For example: `c:\agent\_work\1\a` A typical way to use this folder is to publish your build artifacts with the Copy files and Publish build artifacts tasks. Note: Build.ArtifactStagingDirectory and Build.StagingDirectory are interchangeable. This directory is purged before each new build, so you don't have to clean it up yourself. See Artifacts in Azure Pipelines. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Git.SubmoduleCheckout	The value you've selected for Checkout submodules on the repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.SourceTfvcShelveset	Defined if your repository is Team Foundation Version Control. If you are running a gated build or a shelveset build, this is set to the name of the shelveset you are building. Note: This variable yields a value that is invalid for build use in a build number format.
Common.TestResultsDirectory	The local path on the agent where the test results are created. For example: `c:\agent\_work\1\TestResults` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.

System variables

Variable	Description
System.AccessToken	Use the OAuth token to access the REST API.
System.CollectionId	The GUID of the TFS collection or Azure DevOps organization
System.DefaultWorkingDirectory	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.DefinitionId	The ID of the build pipeline.
System.HostType	Set to `build` if the pipeline is a build or `release` if the pipeline is a release.
System.PullRequest.PullRequestId	The ID of the pull request that caused this build. For example: `17`. (This variable is initialized only if the build ran because of a Git PR affected by a branch policy.)
System.PullRequest.SourceBranch	The branch that is being reviewed in a pull request. For example: `refs/heads/users/raisa/new-feature`. (This variable is initialized only if the build ran because of a Git PR affected by a branch policy.)
System.PullRequest.SourceRepositoryURI	The URL to the repo that contains the pull request. For example: `http://our-server:8080/tfs/DefaultCollection/_git/OurProject`. (This variable is initialized only if the build ran because of a Azure Repos Git PR affected by a branch policy.)
System.PullRequest.TargetBranch	The branch that is the target of a pull request. For example: `refs/heads/master`. This variable is initialized only if the build ran because of a Git PR affected by a branch policy.
System.TeamFoundationCollectionUri	The URI of the team foundation collection. For example: `http://our-server:8080/tfs/DefaultCollection/`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.TeamProject	The name of the project that contains this build.
System.TeamProjectId	The ID of the project that this build belongs to.
TF_BUILD	Set to `True` if the script is being run by a build task. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.

Agent variables

Note

Variable	Description
Agent.BuildDirectory	The local path on the agent where all folders for a given build pipeline are created. For example: TFS 2015.4: `C:\TfsData\Agents\Agent-MACHINENAME_work\1` TFS 2015 RTM user-installed agent: `C:\Agent_work\6c3842c6` TFS 2015 RTM built-in agent: `C:\TfsData\Build_work\6c3842c6`
Agent.HomeDirectory	The directory the agent is installed into. This contains the agent software. For example: TFS 2015.4: `C:\TfsData\Agents\Agent-MACHINENAME` TFS 2015 RTM user-installed agent: `C:\Agent` TFS 2015 RTM built-in agent: `C:\Program Files\Microsoft Team Foundation Server 14.0\Build`
Agent.Id	The ID of the agent.
Agent.JobStatus	The status of the build. `Canceled` `Failed` `Succeeded` `SucceededWithIssues` (partially successful) Note: The environment variable can be referenced only as `agent.jobstatus`. `AGENT_JOBSTATUS` was not present in TFS 2015.
Agent.MachineName	The name of the machine on which the agent is installed. This variable is available in TFS 2015.4, not in TFS 2015 RTM.
Agent.Name	The name of the agent that is registered with the pool. This name is specified by you. See agents.
Agent.WorkFolder	The working directory for this agent. For example: `c:\agent\_work`.

Build variables

Variable	Description
Build.ArtifactStagingDirectory	The local path on the agent where any artifacts are copied to before being pushed to their destination. A typical way to use this folder is to publish your build artifacts with the Copy files and Publish build artifacts tasks. See Artifacts in Azure Pipelines. For example: TFS 2015.4: `C:\TfsData\Agents\Agent-MACHINENAME\_work\1\a` TFS 2015 RTM default agent: `C:\TfsData\Build\_work\6c3842c6\artifacts` TFS 2015 RTM agent installed by you: `C:\Agent\_work\6c3842c6\artifacts` This directory is purged before each new build, so you don't have to clean it up yourself. In TFS 2015.4, Build.ArtifactStagingDirectory and Build.StagingDirectory are interchangeable. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.BuildId	The ID of the record for the completed build.
Build.BuildNumber	The name of the completed build. You can specify the build number format that generates this value in the pipeline options. A typical use of this variable is to make it part of the label format, which you specify on the repository tab. Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of a version control tag.
Build.BuildUri	The URI for the build. For example: `vstfs:///Build/Build/1430`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.BinariesDirectory	The local path on the agent you can use as an output folder for compiled binaries. Available in TFS 2015.4. By default, new build pipelines are not set up to clean this directory. You can define your build to clean it up on the Repository tab. For example: `C:\TfsData\Agents\Agent-MACHINENAME\_work\1\b` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.DefinitionName	The name of the build pipeline. Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.DefinitionVersion	The version of the build pipeline.
Build.QueuedBy	See "How are the identity variables set?". Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.QueuedById	See "How are the identity variables set?".
Build.Repository.Clean	The value you've selected for Clean in the source repository settings. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.LocalPath	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag. This variable is synonymous with Build.SourcesDirectory.
Build.Repository.Name	The name of the repository. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Provider	The type of repository you selected. `TfsGit`: TFS Git repository `TfsVersionControl`: Team Foundation Version Control `Git`: Git repository hosted on an external server `Svn`: Subversion (available on TFS 2015.4) This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Tfvc.Workspace	Defined if your repository is Team Foundation Version Control. The name of the TFVC workspace used by the build agent. For example, if the Agent.BuildDirectory is `c:\agent\_work\12` and the Agent.Id is `8`, the workspace name could be: `ws_12_8` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Uri	The URL for the repository. For example: Git: `https://fabrikamfiber/tfs/DefaultCollection/Scripts/_git/Scripts` TFVC: `https://fabrikamfiber/tfs/DefaultCollection/` This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.RequestedFor	See "How are the identity variables set?". Note: This value can contain whitespace or other invalid label characters. In these cases, the label format will fail.
Build.RequestedForId	See "How are the identity variables set?".
Build.SourceBranch	The branch the build was queued for. Some examples: Git repo branch: `refs/heads/master` Git repo pull request: `refs/pull/1/merge` TFVC repo branch: `$/teamproject/main` TFVC repo gated check-in: `Gated_2016-06-06_05.20.51.4369;username@live.com` TFVC repo shelveset build: `myshelveset;username@live.com` When you use this variable in your build number format, the forward slash characters (`/`) are replaced with underscore characters `_`). Note: In TFVC, if you are running a gated check-in build or manually building a shelveset, you cannot use this variable in your build number format.
Build.SourceBranchName	The name of the branch the build was queued for. Git repo branch or pull request: The last path segment in the ref. For example, in `refs/heads/master` this value is `master`. TFVC repo branch: The last path segment in the root server path for the workspace. For example in `$/teamproject/main` this value is `main`. TFVC repo gated check-in or shelveset build is the name of the shelveset. For example, `Gated_2016-06-06_05.20.51.4369;username@live.com` or `myshelveset;username@live.com`. Note: In TFVC, if you are running a gated check-in build or manually building a shelveset, you cannot use this variable in your build number format.
Build.SourcesDirectory	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag. This variable is synonymous with Build.Repository.LocalPath.
Build.SourcesDirectoryHash	Note: This variable is available in TFS 2015 RTM, but not in TFS 2015.4.
Build.SourceVersion	The latest version control change that is included in this build. Git: The commit ID. TFVC: the changeset. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.SourceVersionMessage	The comment of the commit or changeset. Note: This variable is available in TFS 2015.4.
Build.StagingDirectory	TFS 2015 RTM The local path on the agent you can use as an output folder for compiled binaries. For example: `C:\TfsData\Build\_work\6c3842c6\staging`. By default, new build pipelines are not set up to clean this directory. You can define your build to clean it up on the Repository tab. TFS 2015.4 The local path on the agent where any artifacts are copied to before being pushed to their destination. For example: `C:\TfsData\Agents\Agent-MACHINENAME\_work\1\a` This directory is purged before each new build, so you don't have to clean it up yourself. A typical way to use this folder is to publish your build artifacts with the Copy files and Publish build artifacts tasks. See Artifacts in Azure Pipelines. In TFS 2015.4, Build.ArtifactStagingDirectory and Build.StagingDirectory are interchangeable. All versions of TFS 2015 This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.Repository.Git.SubmoduleCheckout	The value you've selected for Checkout submodules on the repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
Build.SourceTfvcShelveset	Defined if your repository is Team Foundation Version Control. If you are running a gated build or a shelveset build, this is set to the name of the shelveset you are building. Note: This variable yields a value that is invalid for build use in a build number format.
Common.TestResultsDirectory	The local path on the agent where the test results are created. For example: `c:\agent\_work\1\TestResults`. Available in TFS 2015.4. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.

System variables

Variable	Description
System.AccessToken	Available in TFS 2015.4. Use the OAuth token to access the REST API. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.CollectionId	The GUID of the TFS collection or Azure DevOps organization
System.DefaultWorkingDirectory	The local path on the agent where your source code files are downloaded. For example: `c:\agent\_work\1\s` By default, new build pipelines update only the changed files. You can modify how files are downloaded on the Repository tab. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.DefinitionId	The ID of the build pipeline.
System.HostType	Set to `build` if the pipeline is a build or `release` if the pipeline is a release.
System.PullRequest.PullRequestId	The ID of the pull request that caused this build. For example: `17`. (This variable is initialized only if the build ran because of a Git PR affected by a branch policy.)
System.PullRequest.SourceBranch	The branch that is being reviewed in a pull request. For example: `refs/heads/users/raisa/new-feature`. (This variable is initialized only if the build ran because of a Git PR affected by a branch policy.)
System.PullRequest.SourceRepositoryURI	The URL to the repo that contains the pull request. For example: `http://our-server:8080/tfs/DefaultCollection/_git/OurProject`. (This variable is initialized only if the build ran because of a Azure Repos Git PR affected by a branch policy.)
System.PullRequest.TargetBranch	The branch that is the target of a pull request. For example: `refs/heads/master`. This variable is initialized only if the build ran because of a Git PR affected by a branch policy.
System.TeamFoundationCollectionUri	The URI of the team foundation collection. For example: `http://our-server:8080/tfs/DefaultCollection/`. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.
System.TeamProject	The name of the project that contains this build.
System.TeamProjectId	The ID of the project that this build belongs to.
TF_BUILD	Set to `True` if the script is being run by a build task. This variable is agent-scoped. It can be used as an environment variable in a script and as a parameter in a build task, but not as part of the build number or as a version control tag.

How are the identity variables set?

The value depends on what caused the build.

If the build is triggered...	Then the Build.QueuedBy and Build.QueuedById values are based on...	Then the Build.RequestedFor and Build.RequestedForId values are based on...
In Git or TFVC by the Continuous integration (CI) triggers	The system identity, for example: `[DefaultCollection]\Project Collection Service Accounts`	The person who pushed or checked in the changes.
In Git or by a branch policy build.	The system identity, for example: `[DefaultCollection]\Project Collection Service Accounts`	The person who checked in the changes.
In TFVC by a gated check-in trigger	The person who checked in the changes.	The person who checked in the changes.
In Git or TFVC by the Scheduled triggers	The system identity, for example: `[DefaultCollection]\Project Collection Service Accounts`	The system identity, for example: `[DefaultCollection]\Project Collection Service Accounts`
Because you clicked the Queue build button	You	You

Predefined build variables

Build.Clean

System.AccessToken

System.Debug

Agent variables

Build variables

System variables

Agent variables

Build variables

System variables

Agent variables

Build variables

System variables

Agent variables

Build variables

System variables

Agent variables

Build variables

System variables

How are the identity variables set?

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