Get Configurable Inbuilt Tools

List all configurable inbuilt tools from the catalogue.

Returns a list of entries, each containing:

• key: the stable configurable_key (e.g. "call_forward").
• title: human-readable display name.
• registry_tool_id: the TOOL_REGISTRY key for the underlying function.
• config_schema: JSON schema of the extra user-configurable fields.