/**
 * All CLI harness names supported by `CliAgent` and `ptbk agent exec`.
 *
 * @public exported from `@promptbook/node`
 */
export declare const CLI_AGENT_HARNESS_NAMES: readonly ["openai-codex", "github-copilot", "cline", "claude-code", "opencode", "gemini"];
/**
 * All supported thinking-level values for CLI coding-agent runners.
 *
 * @public exported from `@promptbook/node`
 */
export declare const CLI_AGENT_THINKING_LEVEL_VALUES: readonly ["low", "medium", "high", "xhigh"];
/**
 * Environment variable used as the default runner identifier when `--harness` is omitted or not set in `CliAgent`.
 *
 * Set this to one of the harness names (`openai-codex`, `github-copilot`, `cline`, `claude-code`, `opencode`, `gemini`)
 * so that `CliAgent` and `ptbk agent exec` can run without an explicit `harness` option.
 *
 * @public exported from `@promptbook/node`
 */
export declare const PTBK_HARNESS_ENV = "PTBK_HARNESS";
/**
 * Environment variable used as the default runner model when `--model` is omitted or not set in `CliAgent`.
 *
 * @public exported from `@promptbook/node`
 */
export declare const PTBK_MODEL_ENV = "PTBK_MODEL";
/**
 * Environment variable used as the default thinking level when `--thinking-level` is omitted or not set in `CliAgent`.
 *
 * @public exported from `@promptbook/node`
 */
export declare const PTBK_THINKING_LEVEL_ENV = "PTBK_THINKING_LEVEL";