import type { ChatMessage } from '../runtime/chatTypes.js';
export declare const DEFAULT_CHARS_PER_TOKEN = 4;
export declare const DEFAULT_IMAGE_TOKENS_HIGH = 1300;
export declare const DEFAULT_IMAGE_TOKENS_LOW = 340;
export declare const DEFAULT_MESSAGE_OVERHEAD = 4;
export type ContextCompactionAction = 'none' | 'masked' | 'trimmed' | 'over_budget_untrimmed';
export interface TrimConversationResult {
    messages: ChatMessage[];
    trimmedCount: number;
    insertedSummary: boolean;
    tokensSaved: number;
    beforeTokens: number;
    afterTokens: number;
    availableTokens: number;
    inputBudget: number;
    action: ContextCompactionAction;
    messageCountBefore: number;
    messageCountAfter: number;
    groupCountBefore?: number;
    groupCountAfter?: number;
    trimmedGroups: number;
    keptGroups: number;
    protectedGroups: number;
    summaryTokens: number;
    summaryTokenBudget: number;
}
export interface TrimConversationOptions {
    minProtectedGroups?: number;
    unmaskableTools?: ReadonlySet<string>;
    videoTools?: ReadonlySet<string>;
    audioTools?: ReadonlySet<string>;
    charsPerToken?: number;
    imageTokensHigh?: number;
    imageTokensLow?: number;
    messageOverhead?: number;
}
export declare function estimateMessageTokens(message: ChatMessage, options?: TrimConversationOptions): number;
export declare function estimateTotalTokens(messages: ChatMessage[], options?: TrimConversationOptions): number;
export interface ContextBudgetInput {
    contextLength: number;
    outputBudget: number;
    safetyMargin?: number;
    toolSchemaTokens?: number;
}
export interface ContextBudgetResult {
    contextLength: number;
    outputBudget: number;
    safetyMargin: number;
    toolSchemaTokens: number;
    inputBudget: number;
}
export declare const DEFAULT_CONTEXT_SAFETY_MARGIN = 2048;
export declare const DEFAULT_TOOL_SCHEMA_TOKENS = 16000;
export declare function computeContextBudget(input: ContextBudgetInput): ContextBudgetResult;
export declare function trimConversation(messages: ChatMessage[], systemMessage: ChatMessage, inputBudget: number, options?: TrimConversationOptions): TrimConversationResult;
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