anchor.diff:     --debug                     Enable debug mode [$BUILDKITE_AGENT_DEBUG]
      --debug-http                Enable HTTP debug mode, which dumps all request and response bodies to the log [$BUILDKITE_AGENT_DEBUG_HTTP]
   ```
  +
  +## Checking if data exists
  +
  +```
  +$ buildkite-agent meta-data exists --help
  +Usage:
  +
  +   buildkite-agent meta-data exists <key> [arguments...]
  +
  +Description:
  +
  +   The command exits with a status of 0 if the key has been set, or it will
  +   exit with a status of 100 if the key doesn't exist.
  +
  +Example:
  +
  +   $ buildkite-agent meta-data exists "foo"
  +
  +Options:
  +
  +   --job value                 Which job should the meta-data be checked for [$BUILDKITE_JOB_ID]
  +   --agent-access-token value  The access token used to identify the agent [$BUILDKITE_AGENT_ACCESS_TOKEN]
  +   --endpoint value            The Agent API endpoint (default: "https://agent.buildkite.com/v3") [$BUILDKITE_AGENT_ENDPOINT]
  +   --no-color                  Don't show colors in logging [$BUILDKITE_AGENT_NO_COLOR]
  +   --debug                     Enable debug mode [$BUILDKITE_AGENT_DEBUG]
  +   --debug-http                Enable HTTP debug mode, which dumps all request and response bodies to the log [$BUILDKITE_AGENT_DEBUG_HTTP]
  +```
  
positive.code: 
  <%= toc %>
  
  ## Setting Data
  
  Use this command in your build scripts to save simple string data to the build for retrieval in future steps.
  
  
negative.code:    --debug-http                Enable HTTP debug mode, which dumps all request and response bodies to the log [$BUILDKITE_AGENT_DEBUG_HTTP]
  ```
  
  ## Getting data
  
  ```
  $ buildkite-agent meta-data get --help
  