/**
 * Coerces a LangChain `AIMessage.content` into plain text.
 *
 * `.content` is NOT always a string. Depending on the provider surface it is
 * either a single string or an array of content parts
 * (`[{ type: "text", text: "…" }, …]`) — Gemini has always done the latter, and
 * the Azure Responses API surface returns parts for ordinary chat completions
 * too. `String(content)` on the array form yields the literal `"[object Object]"`,
 * which is indistinguishable from a real summary once it has been persisted:
 * it is a non-empty string, so every `?? ""` and `.trim().length > 0` guard
 * downstream happily passes it through to the database and into emails.
 *
 * Always route model output through this function instead of `String(...)`.
 */
export type MessageContent = string | Array<{
    type?: string;
    text?: string;
}> | null | undefined;
export declare const extractMessageText: (content: MessageContent) => string;
//# sourceMappingURL=message.content.d.ts.map