export interface RunMeta {
    name: string;
    agent?: string;
    projectRoot?: string;
    mode?: string;
}
export interface StepMeta {
    name: string;
}
export interface StepEnd {
    duration: number;
}
export interface RunEnd {
    steps: number;
    tools: number;
    errors: number;
    tokens: number;
}
export interface ToolCallEvent {
    tool: string;
    runId: string;
    stepId: string;
    input: unknown;
    output: unknown;
    duration: number;
    success: boolean;
    tokens?: number;
    resultCount?: number;
    resultSizeBytes?: number;
    error?: string;
}
export interface LlmCallEvent {
    runId: string;
    stepId: string;
    model: string;
    prompt?: string;
    response?: string;
    duration: number;
    tokens?: number;
}
export interface FreeEvent {
    runId: string;
    level: "debug" | "info" | "warn" | "error";
    message: string;
    data?: Record<string, unknown>;
}
export declare class LogWriter {
    private logRoot;
    private tracesDir;
    private sessionsDir;
    private errorsPath;
    private metricsPath;
    private sessionDate;
    private sessionFd;
    private sessionFileSize;
    private activeSpans;
    private noop;
    constructor(projectRoot: string);
    private ensureDirs;
    private openSessionFile;
    private cleanupStaleFiles;
    startRun(meta: RunMeta): string;
    startStep(runId: string, meta: StepMeta): string;
    endStep(stepId: string, summary: StepEnd): void;
    endRun(runId: string, summary: RunEnd): void;
    toolCall(event: ToolCallEvent): void;
    llmCall(event: LlmCallEvent): void;
    event(event: FreeEvent): void;
    flush(): void;
    close(): void;
    private writeSpan;
    private writeSessionEvent;
    private writeError;
    private writeLine;
    private findRunId;
    private tryParse;
    private truncate;
    private redact;
}
export declare function getLogWriter(projectRoot?: string): LogWriter;
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