POST /get-app-tool-schema/{app_id}

One round of multi-step schema resolution for an app tool template against a connected App. parameters is the input parameters resolved so far, with properties configured by const or description, and is empty on the first call. Returns the next input_schema to fill; complete marks the last round (it may accompany the final input_schema) and may include an optional response_schema. Input-schema property descriptions provide the default text for LLM inference, and each property's default_input_mode ("const" or "description") is the input mode to preselect for it. A property may also carry extra_info ({ text?, link? }), guidance to render under its editor, e.g. a docs link on how to find an id. Used by the tool config UI. enum_labels maps enum values to display labels; forbid_literal_const allows only description or a {{variable}}.