/**
 * log_usage tool — Record token usage and cost for an agent operation.
 *
 * Usage records are markdown notes in the Usage/ folder with structured
 * YAML frontmatter. They track input/output tokens, model, cost, and
 * duration for individual agent operations. If a task_id is provided,
 * a summary is also appended to that task's Agent Log.
 */
import { z } from "zod";
import { Vault } from "../vault.js";
import { Config } from "../config.js";
export declare const logUsageSchema: {
    agent_id: z.ZodString;
    task_id: z.ZodOptional<z.ZodString>;
    project_id: z.ZodOptional<z.ZodString>;
    input_tokens: z.ZodNumber;
    output_tokens: z.ZodNumber;
    model: z.ZodOptional<z.ZodString>;
    cost_usd: z.ZodOptional<z.ZodNumber>;
    duration_seconds: z.ZodOptional<z.ZodNumber>;
    notes: z.ZodOptional<z.ZodString>;
};
export declare const logUsageHandler: (vault: Vault, config: Config) => (input: {
    agent_id: string;
    task_id?: string;
    project_id?: string;
    input_tokens: number;
    output_tokens: number;
    model?: string;
    cost_usd?: number;
    duration_seconds?: number;
    notes?: string;
}) => Promise<{
    content: {
        type: "text";
        text: string;
    }[];
    isError?: boolean;
}>;
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