anchor.diff:  
   <h3 class="h3-caps">BUILDKITE_AGENT_ENDPOINT</h3>
   
  -The value of the `endpoint` [agent configuration option](/docs/agent/v3/configuration). The value cannot be modified as an environment variable. This is set as an environment variable by the bootstrap and then read by most of the `buildkite-agent` commands. 
  +The value of the `endpoint` [agent configuration option](/docs/agent/v3/configuration). The value cannot be modified as an environment variable. This is set as an environment variable by the bootstrap and then read by most of the `buildkite-agent` commands.
   
   Default: `"https://agent.buildkite.com/v3"`
   
  
positive.code: 
  <h3 class="h3-caps">BUILDKITE_STEP_KEY</h3>
  
  The value of the `key` [command step attribute](/docs/pipelines/command-step#command-step-attributes), a unique string set by you to identify a step. This value cannot be modified as an environment variable. 
  
  Example: "tests-06"
  
  
negative.code: 
  <h3 class="h3-caps">BUILDKITE_AGENT_META_DATA_*</h3>
  
  The value of each [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"`
  
  