/**
 * Probe the runtime environment for available tools and runtimes, and build
 * a markdown section describing them for the system prompt.
 *
 * Runs once at session start. All probes execute in parallel with a per-probe
 * timeout so the total wall time is bounded by the slowest single probe.
 */
/**
 * Probe the runtime environment for available tools and runtimes at
 * session start, and build a markdown section describing them for the
 * system prompt.
 *
 * All probes execute in parallel with a per-probe timeout so total wall
 * time is bounded by the slowest single probe.
 *
 * @param projectDir - The project working directory
 * @returns Markdown section string, or undefined when no tools are found
 * @docLink packages/runner/dev-guide#environment-variables
 */
export declare function buildEnvironmentSection(projectDir: string): Promise<string | undefined>;
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