MCP server v2.13.0: Version discard tool, dataset descriptions, and transport compatibility fixes

New Features

version_discard tool. New tool for removing document versions from a release, split out from discard_drafts for a clearer API.

Dataset descriptions. create_dataset, update_dataset, and list_datasets now support a description field.

Improvements

System prompt. Added guidance directing agents to use search_docs and read_docs tools for accessing Sanity documentation instead of web searches.

Fixes

MCP transport compatibility. Fixed an issue where clients sending params: null in JSON-RPC notifications (e.g. Claude Code, Cursor) would receive errors.

get_schema tool. Fixed an error that occurred when a schema type has a preview field with a null select value.

get_schema tool. Improved error message when an unknown type name is provided to now list valid type names.

Removals

Release management tools. Removed tools for managing releases. Releases can still be managed through Sanity Studio or the HTTP API.