/**
 * Git worktree creation and removal utilities for the SDK.
 * Used by EnterWorktree and ExitWorktree tools.
 */
export interface WorktreeInfo {
    name: string;
    path: string;
    branch: string;
    repoRoot: string;
    isNew: boolean;
    /** HEAD commit of the original branch at creation time, for dirty-check on exit */
    originalHeadCommit?: string;
}
/**
 * Validate a worktree name to prevent path traversal and invalid characters.
 */
export declare function validateWorktreeName(name: string): void;
/**
 * Generate a random worktree name.
 */
export declare function generateWorktreeName(): string;
/**
 * Get the current HEAD commit SHA.
 */
export declare function getHeadCommit(cwd: string): string;
/**
 * Create a git worktree for use during a session.
 */
export declare function createWorktree(name: string, cwd: string): WorktreeInfo;
/**
 * Remove a git worktree and its branch.
 */
export declare function removeWorktree(info: WorktreeInfo): void;
/**
 * Count uncommitted files and new commits in a worktree.
 * Returns null if git commands fail (fail-closed).
 */
export declare function countWorktreeChanges(worktreePath: string, originalHeadCommit: string | undefined): {
    changedFiles: number;
    commits: number;
} | null;