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_BRANCH</h3>
  
  The branch being built. The value cannot be modified as an environment variable.
  
  Example: `"master"`
  
  
negative.code: 
  <h3 class="h3-caps">BUILDKITE_IGNORED_ENV</h3>
  
  A list of environment variables that have been set in your pipeline that are protected and will be overridden, used internally to pass data from the bootstrap to the agent. The value cannot be modified.
  
  Example: `"BUILDKITE_GIT_CLEAN_FLAGS"`
  
  <h3 class="h3-caps">BUILDKITE_JOB_ID</h3>
  
  The internal UUID Buildkite uses for this job. The value cannot be modified.
  
  Example: `"e44f9784-e20e-4b93-a21d-f41fd5869db9"`
  
  <h3 class="h3-caps">BUILDKITE_LABEL</h3>
  
  The label/name of the current job. The value cannot be modified.
  
  Example: `"\:hammer\: Specs"`
  
  <h3 class="h3-caps">BUILDKITE_LAST_HOOK_EXIT_STATUS</h3>
  
  The exit code of the last hook that ran, used internally by the hooks. The value cannot be modified.
  
  Example: `"-1"`
  
  