anchor.diff:  
   <h3 class="h3-caps">BUILDKITE_PIPELINE_DEFAULT_BRANCH</h3>
   
  -The default branch for this pipeline. The value cannot be modified as an environment variable.
  +The default branch for this pipeline. The value cannot be modified.
   
   Example: `"master"`
   
   <h3 class="h3-caps">BUILDKITE_PIPELINE_NAME</h3>
   
  -The way pipeline name is displayed in Buildkite. The value cannot be modified as an environment variable.
  +The displayed pipeline name on Buildkite. The value cannot be modified.
   
   Example: `"my_project"`
   
   <h3 class="h3-caps">BUILDKITE_PIPELINE_PROVIDER</h3>
   
  -The ID of the source code provider for the pipeline’s repository. The value cannot be modified as an environment variable.
  +The ID of the source code provider for the pipeline’s repository. The value cannot be modified.
   
   Example: `"github"`
   
   <h3 class="h3-caps">BUILDKITE_PIPELINE_SLUG</h3>
   
  -The pipeline slug on Buildkite as used in URLs. The value cannot be modified as an environment variable.
  -
  -Example: `"my-pipeline"`
  +The pipeline slug on Buildkite as used in URLs. The value cannot be modified.
  +
  +Example: `"my-project"`
   
   <h3 class="h3-caps">BUILDKITE_PLUGINS_ENABLED</h3>
   
  
positive.code: 
  <h3 class="h3-caps">BUILDKITE_TAG</h3>
  
  The name of the tag being built, if this build was triggered from a tag. The value cannot be modified as an environment variable.
  
  Example: `"v1.2.3"`
  
  <h3 class="h3-caps">BUILDKITE_TIMEOUT</h3>
  
  The number of minutes until Buildkite automatically cancels this job, if a timeout has been specified. The value cannot be modified as an environment variable.
  
  Example: `"15"` for 15 minutes, or `"false"` if no timeout is set
  
  <h3 class="h3-caps">BUILDKITE_TRIGGERED_FROM_BUILD_ID</h3>
  
  The UUID of the build that triggered this build. The value cannot be modified as an environment variable.
  
  Example: `"5aa7c894-c8c0-435b-bc17-13923b90f163"`, or `""` if the build was not triggered from another build.
  
  <h3 class="h3-caps">BUILDKITE_TRIGGERED_FROM_BUILD_NUMBER</h3>
  
  The number of the build that triggered this build. The value cannot be modified as an environment variable.
  
  Example: `"1264"`, or `""` if the build was not triggered from another build.
  
  <h3 class="h3-caps">BUILDKITE_TRIGGERED_FROM_BUILD_PIPELINE_SLUG</h3>
  
  The slug of the pipeline that was used to trigger this build. The value cannot be modified as an environment variable.
  
  Example: `"build-and-test"`, or `""` if the build was not triggered from another build.
  
  <h3 class="h3-caps">BUILDKITE_UNBLOCKER</h3>
  
  The name of the user who unblocked the build. The value cannot be modified as an environment variable.
  
  Example: `"Carol Danvers"`
  
  <h3 class="h3-caps">BUILDKITE_UNBLOCKER_EMAIL</h3>
  
  The notification email of the user who unblocked the build. The value cannot be modified as an environment variable.
  
  Example: `"carol@nasa.gov"`
  
  <h3 class="h3-caps">BUILDKITE_UNBLOCKER_ID</h3>
  
  The UUID of the user who unblocked the build. The value cannot be modified as an environment variable.
  
  Example: `"4735ba57-80d0-46e2-8fa0-b28223a86586"`
  
  <h3 class="h3-caps">BUILDKITE_UNBLOCKER_TEAMS</h3>
  
  A colon separated list of non-private team names that the user who unblocked the build belongs to. The value cannot be modified as an environment variable.
  
  Example: `"everyone:platform"`
  
  
negative.code: 
  <h3 class="h3-caps">BUILDKITE_AGENT_PID</h3>
  
  The process ID of the agent. The value cannot be modified.
  
  Example: `"6"`
  
  