# Advanced
[masking-span-attributes.md](masking-span-attributes.md "mention")
* Learn how to block PII from logging to Phoenix
[suppress-tracing.md](suppress-tracing.md "mention")
* Learn how to selectively block or turn off tracing
[modifying-spans.md](modifying-spans.md "mention")
* Learn how to send only certain spans to Phoenix
[multimodal-tracing.md](multimodal-tracing.md "mention")
* Learn how to trace images
MCP directory API
We provide all the information about MCP servers via our MCP API.
curl -X GET 'https://glama.ai/api/mcp/v1/servers/Arize-ai/phoenix'
If you have feedback or need assistance with the MCP directory API, please join our Discord server