Claude Code's marketplace schema does not support custom fields. The `integrates_with` field on data-platform and viz-platform caused: "Invalid schema: plugins.9: Unrecognized key: integrates_with" This reverts the schema extension while keeping the validate_workflow_integration MCP tool functional (it reads from plugin.json files directly, not marketplace.json). Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>