/**
 * [WHO]: AgentMessage extensions, convertToLlm(), message transformers
 * [FROM]: Depends on agent-core, ai
 * [TO]: Consumed by index.ts, core/runtime/sdk.ts, core/session/session-manager.ts, modes/interactive/interactive-mode.ts, modes/interactive/components/branch-summary-message.ts, modes/interactive/components/compaction-summary-message.ts, modes/interactive/components/custom-message.ts
 * [HERE]: core/messages.ts - custom message types and LLM transformers
 */
import type { AgentMessage } from "@catui/agent-core";
import type { ImageContent, Message, TextContent } from "@catui/ai/types";
export declare const COMPACTION_SUMMARY_PREFIX = "The conversation history before this point was compacted into the following summary:\n\n<summary>\n";
export declare const COMPACTION_SUMMARY_SUFFIX = "\n</summary>";
export declare const BRANCH_SUMMARY_PREFIX = "The following is a summary of a branch that this conversation came back from:\n\n<summary>\n";
export declare const BRANCH_SUMMARY_SUFFIX = "</summary>";
export declare const CUSTOM_MESSAGE_TYPES_EXCLUDED_FROM_CONTEXT: Set<string>;
/**
 * Message type for bash executions via the ! command.
 */
export interface BashExecutionMessage {
    role: "bashExecution";
    command: string;
    output: string;
    exitCode: number | undefined;
    cancelled: boolean;
    truncated: boolean;
    fullOutputPath?: string;
    timestamp: number;
    /** If true, this message is excluded from LLM context (!! prefix) */
    excludeFromContext?: boolean;
}
/**
 * Message type for extension-injected messages via sendMessage().
 * These are custom messages that extensions can inject into the conversation.
 */
export interface CustomMessage<T = unknown> {
    role: "custom";
    customType: string;
    content: string | (TextContent | ImageContent)[];
    display: boolean;
    details?: T;
    timestamp: number;
}
export interface BranchSummaryMessage {
    role: "branchSummary";
    summary: string;
    fromId: string;
    timestamp: number;
}
export interface CompactionSummaryMessage {
    role: "compactionSummary";
    summary: string;
    tokensBefore: number;
    timestamp: number;
}
declare module "@catui/agent-core" {
    interface CustomAgentMessages {
        bashExecution: BashExecutionMessage;
        custom: CustomMessage;
        branchSummary: BranchSummaryMessage;
        compactionSummary: CompactionSummaryMessage;
    }
}
/**
 * Convert a BashExecutionMessage to user message text for LLM context.
 */
export declare function bashExecutionToText(msg: BashExecutionMessage): string;
export declare function createBranchSummaryMessage(summary: string, fromId: string, timestamp: string): BranchSummaryMessage;
export declare function createCompactionSummaryMessage(summary: string, tokensBefore: number, timestamp: string): CompactionSummaryMessage;
/** Convert CustomMessageEntry to AgentMessage format */
export declare function createCustomMessage(customType: string, content: string | (TextContent | ImageContent)[], display: boolean, details: unknown | undefined, timestamp: string): CustomMessage;
/**
 * Transform AgentMessages (including custom types) to LLM-compatible Messages.
 *
 * This is used by:
 * - Agent's transormToLlm option (for prompt calls and queued messages)
 * - Compaction's generateSummary (for summarization)
 * - Custom extensions and tools
 */
export declare function convertToLlm(messages: AgentMessage[]): Message[];