# X_MCP_LIST_PARAMS_INVALID

## Means

a tool's listParams names a key its own input does not accept

## Typical cause

listParams whitelists a filter, sort, fields, cursor or limit key the query would never read

## Fix

add the key to the query's input schema, or drop it from mcp.listParams

[MCP and AI](/error-codes#mcp-and-ai)