/**
 * Always-on system-prompt block that advertises Symi's email capabilities and
 * points the model at the `connect-email` skill. Fixes the failure mode where
 * the model denied email support because no profile's `promptAdditions`
 * mentioned it — see the sandbox2 interaction that motivated this.
 *
 * Sibling of `buildLongTaskPromptSuffix`; spliced at the same site in
 * `run/attempt.ts` so every profile (Claude, Gemma, Qwen, Nemotron, Ollama)
 * sees it.
 */
export declare function buildEmailCapabilityPromptSuffix(): string;
