@arizeai/phoenix-mcp

# Add Metadata Tracing can be augmented and customized by adding Metadata. Metadata includes your own custom attributes, user ids, session ids, prompt templates, and more. [customize-spans.md](customize-spans.md "mention") * Learn how to add custom metadata and attributes to your traces [instrumenting-prompt-templates-and-prompt-variables.md](instrumenting-prompt-templates-and-prompt-variables.md "mention") * Learn how to define custom prompt templates and variables in your tracing.