# ToolContext: excluded from the model-facing schema, still delivered to the tool

my_account input schema sent to the model:
  {
  "$schema" : "https://json-schema.org/draft/2020-12/schema",
  "type" : "object",
  "properties" : { },
  "required" : [ ],
  "additionalProperties" : false
}

model's tool call arguments (empty -- it was never told a userId parameter exists):
  {}

final answer, using the real userId the CALLER supplied via ChatClient.toolContext():
  You're on the GOLD tier with a balance of $4820.50.