Problem summary
You use Funnel MCP in Claude and query_data fails with type validation errors, while other Funnel MCP tools such as prepare_data, load_workspace and search_fields still work.
Error message or symptoms
Your MCP client may report that the query_data tool is defined with an empty parameters schema ("properties": {}). The client then serializes parameter values as strings, and query_data rejects them with type validation errors for array or object parameters such as dimensions, measures, filter, group_by, order_by and limit.
When does this occur
When you call
query_datain Claude or another MCP client that validates tool parameter types strictlyWhen
query_dataworked previously but started failing without changes on your sideWhen other Funnel MCP tools in the same session work normally
Root cause
The Funnel MCP server published an incomplete parameter schema for the query_data tool. Your MCP client sends parameters in a format the tool rejects. This is a server-side issue and requires a fix from Funnel.
Solution
Confirm other Funnel MCP tools work in the same session (for example
list_workspaces,prepare_data,load_workspace,get_dimension_valuesorsearch_fields).
Try
query_dataagain in a new chat or session so your client reloads the tool definitions.
If it still fails, disconnect and reconnect Funnel MCP in your client, complete OAuth again, then retry
query_datain a new chat or session.
If
query_datastill fails, contact Funnel support. Include:
Your Funnel workspace name
Your MCP client (for example Claude desktop or Claude Code)
The full error text from your MCP client
When the issue started
Confirmation that other Funnel MCP tools work
Retry
query_datain a new session after support confirms the fix is deployed.