/**
 * Per-commit cost receipt.
 *
 * When the agent runs `git commit` through the bash tool, a trailer like
 *
 *   Elyra-Cost: $0.42 (glm-5.3, 4 turns, 1 model switch)
 *
 * is appended to the commit message via `--trailer`, so spend per change is
 * visible in `git log`. This module is pure: it summarizes a window of agent
 * messages, formats the trailer, and rewrites shell commands. Session wiring
 * lives in agent-session.ts.
 */
import type { AgentMessage } from "@elyracode/agent-core";
export declare const COST_TRAILER_KEY = "Elyra-Cost";
export interface CostWindowSummary {
    /** Total USD spent by assistant messages in the window (including errored attempts). */
    costUsd: number;
    /** Assistant messages in the window whose stopReason is not "error". */
    turns: number;
    /** Distinct model ids used in the window, in order of first appearance. */
    models: string[];
    /**
     * Number of times consecutive assistant messages in the window used a different
     * (provider, model) pair. A proxy for failovers and manual model changes; there is
     * no session-scoped failover counter, so this is labeled "model switch" not "failover".
     */
    switches: number;
}
/**
 * Summarize assistant spend for messages with `timestamp >= sinceTs`.
 * Errored messages contribute cost and count toward model switches (a failover
 * leaves an errored message behind) but are not counted as turns.
 */
export declare function summarizeCostWindow(messages: readonly AgentMessage[], sinceTs: number): CostWindowSummary;
/** Format the trailer line. Zero-valued detail parts are omitted. */
export declare function formatCostTrailer(summary: CostWindowSummary): string;
/**
 * True when the command contains at least one `git commit` invocation that should
 * receive a cost trailer. Handles leading env assignments, `&&`/`;`/`|` chains, and
 * git global options (`git -c x=y commit`). False for `--fixup`/`--squash`/`--amend`
 * commits and when the command already carries an `Elyra-Cost:` trailer.
 */
export declare function isGitCommitCommand(command: string): boolean;
/**
 * Append `--trailer '<trailer>'` to every eligible `git commit` invocation in the
 * command. The argument is inserted before a `--` pathspec separator when present,
 * otherwise after the last word of the invocation, so `-m "..."` arguments and
 * following chained commands are left intact.
 */
export declare function injectCostTrailer(command: string, trailer: string): string;
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