/**
 * Provider-agnostic types and interface for LLM providers.
 *
 * The internal message format follows Anthropic's structure (content blocks).
 * Each provider adapter translates to/from this format at the boundary.
 */
export type Role = "user" | "assistant";
export interface TextBlock {
    type: "text";
    text: string;
}
export interface ToolUseBlock {
    type: "tool_use";
    id: string;
    name: string;
    input: Record<string, unknown>;
}
export interface ToolResultBlock {
    type: "tool_result";
    tool_use_id: string;
    content: string;
}
export type ContentBlock = TextBlock | ToolUseBlock;
export interface Message {
    role: Role;
    content: ContentBlock[] | ToolResultBlock[];
}
export interface TokenUsage {
    inputTokens: number;
    outputTokens: number;
}
export interface ApiResponse {
    content: ContentBlock[];
    stop_reason: "end_turn" | "tool_use" | "max_tokens" | string;
    usage?: TokenUsage;
}
export interface Tool {
    name: string;
    description: string;
    input_schema: Record<string, unknown>;
}
export interface LLMProviderOptions {
    apiKey: string;
    model: string;
    url: string;
    maxTokens?: number | undefined;
    system?: string | undefined;
    tools?: Tool[] | undefined;
    stream?: boolean | undefined;
    noApiKey?: boolean;
}
export interface LLMProvider {
    /** If true, this provider does not require an API key by default. */
    noApiKey?: boolean;
    /** Build the fetch RequestInit for this provider. */
    buildRequest(messages: Message[], options: LLMProviderOptions): RequestInit;
    /** Parse the raw JSON response into unified ApiResponse. */
    parseResponse(raw: unknown): ApiResponse;
    /** Parse an SSE stream, calling onText for each text chunk. Returns the full response. */
    parseStream(body: ReadableStream<Uint8Array>, onText: (text: string) => void): Promise<ApiResponse>;
}
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