/** Slack caps user/profile names at 80 characters. */
export declare const SLACK_BOT_USER_NAME_MAX_LENGTH = 80;
export declare function formatMarkdownForSlack(text: string): string;
export declare function normalizeSlackMarkdownToMarkdown(text: string): string;
/**
 * Rewrites Slack's angle-bracket mention tokens into the text a human reads, so
 * a third party mentioned in a message reaches the model as `@Alice` rather than
 * the opaque `<@U08ABC>`.
 *
 * Resolution is purely local: it uses the label Slack already inlines after `|`
 * and never calls the Web API, so it costs no request and needs no extra scope.
 * A bare `<@U08ABC>` with no inline label degrades to `@U08ABC` -- still an
 * improvement over the raw token, and the opt-in user directory upgrades it to a
 * real display name.
 */
export declare function renderSlackMentionTokens(text: string): string;
/**
 * Accept only a bounded, token-safe authenticated Slack username before it can
 * become model-visible mention text.
 */
export declare function normalizeSlackBotUserName(value: unknown): string | undefined;
/**
 * Preserve one readable self-address marker while removing duplicate forms.
 * Protected Markdown code is opaque to identity matching.
 */
export declare function preserveSlackSelfMentionText(text: string, options: {
    readonly botUserIds: readonly string[];
    readonly mentionTextAliases: readonly string[];
    readonly botUserName?: string;
}): string;
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