anchor.diff:  
   <h3 class="h3-caps">BUILDKITE_BIN_PATH</h3>
   
  -The path to the `buildkite-agent` binary. The value cannot be modified as an environment variable.
  +The path to the directory containing the `buildkite-agent` binary. The value cannot be modified as an environment variable.
   
   Example: `"/usr/local/bin/buildkite-agent"`
   
  
positive.code: 
  <h3 class="h3-caps">BUILDKITE_PLUGIN_VALIDATION</h3>
  
  Whether to validate plugin configuration and requirements. The value can be modified by exporting the environment variable in the `environment` or `pre-checkout` hooks, or in a `pipeline.yml` file. It can also be enabled using the `no-plugin-validation` [agent configuration option](/docs/agent/v3/configuration). 
  
  Default: `"false"`
  
  
negative.code: 
  <h3 class="h3-caps">BUILDKITE_S3_SECRET_ACCESS_KEY</h3>
  
  The secret access key for your S3 IAM user, for use with [private S3 buckets](/docs/agent/v3/cli-artifact#using-your-private-aws-s3-bucket). The variable is read by the `buildkite-agent artifact upload` command, as well as during the artifact upload phase of [command steps](/docs/pipelines/command-step#command-step-attributes). The value can only be set by exporting the environment variable in the `environment`, `pre-checkout` or `pre-command` hooks. Do not print or export this variable anywhere except your agent hooks.
  
  Example: `"wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY"`
  
  