anchor.diff:  
   <h3 class="h3-caps">BUILDKITE_AGENT_DEBUG</h3>
   
  -The value of the `debug` [agent configuration option](https://buildkite.com/docs/agent/v3/configuration). The value cannot be modified as an environment variable.
  +The value of the `debug` [agent configuration option](/docs/agent/v3/configuration). The value cannot be modified as an environment variable.
   
   Values: `"true"` and `"false"`
   
   <h3 class="h3-caps">BUILDKITE_AGENT_ENDPOINT</h3>
   
  -The value of the `endpoint` [agent configuration option](https://buildkite.com/docs/agent/v3/configuration). The value cannot be modified as an environment variable. This variable is read by the `buildkite-agent artifact ???` commands.
  +The value of the `endpoint` [agent configuration option](/docs/agent/v3/configuration). The value cannot be modified as an environment variable. This variable is read by the `buildkite-agent artifact ???` commands.
   
   Example: `"https://agent.buildkite.com/v3"`
   
  +<h3 class="h3-caps">BUILDKITE_AGENT_EXPERIMENT</h3>
  +
  +A list of the experimental agent features that are currently enabled. The value cannot be modified as an environment variable. The value can be set using the `--experiment` flag on the [`buildkite-agent start` command](/docs/agent/v3/cli-start#starting-an-agent).   
  +
  +<h3 class="h3-caps">BUILDKITE_AGENT_META_DATA_*</h3>
  +
  +The value of each of [agent tag](/docs/agent/v3/cli-start#setting-tags). The tag name is appended to the end of the variable name. The name and value cannot be modified as an environment variable. They can be set using the `--tags` flag on the `buildkite-agent start` command, or in the [agent configuration file](/docs/agent/v3/configuration). The [Queue tag](/docs/agent/v3/queues) is specifically used for isolating jobs and agents, and appears as the `BUILDKITE_AGENT_META_DATA_QUEUE` environment variable. 
  +
  +Example: `"BUILDKITE_AGENT_META_DATA_TAGNAME=tagvalue"`, `"BUILDKITE_AGENT_META_DATA_QUEUE=some-queue"`
  +
  +<h3 class="h3-caps">BUILDKITE_AGENT_NAME</h3>
  +
  +The name of the agent that ran the job. The value cannot be modified as an environment variable.
  +
  +Example: `"elastic-builders-088264dc4f9"`
  +
   <h3 class="h3-caps">BUILDKITE_AGENT_PID</h3>
   
   The process ID of the agent. The value cannot be modified.
  
positive.code: 
  <h3 class="h3-caps">BUILDKITE_COMMAND_EVAL</h3>
  
  The opposite of the value of the `no-command-eval` [agent configuration option](https://buildkite.com/docs/agent/v3/configuration). The value cannot be modified as an environment variable.
  
  Values: `"true"` and `"false"`
  
  
negative.code: 
  <h3 class="h3-caps">BUILDKITE_PLUGINS_ENABLED</h3>
  
  The opposite of the value of the `no-plugins` [agent configuration option](/docs/agent/v3/configuration). The value cannot be modified as an environment variable.
  
  Values: `"true"` and `"false"`
  
  <h3 class="h3-caps">BUILDKITE_PLUGINS_PATH</h3>
  
  The value of the `plugins-path` [agent configuration option](/docs/agent/v3/configuration). The value cannot be modified as an environment variable.
  
  Example: `"/etc/buildkite-agent/plugins/"`
  
  