/**
 * Configuration reader for paper-search-agent.
 * Reads config.toml and exposes typed switches for discovery sources,
 * retrieval routes, and optional integrations.
 */
export interface PathConfig {
    cache_dir: string;
    corpus_dir: string;
}
export interface DiscoveryConfig {
    openalex: boolean;
    crossref: boolean;
    scopus: boolean;
    springer_meta: boolean;
    arxiv: boolean;
    pubmed: boolean;
    europe_pmc: boolean;
    semantic_scholar: boolean;
    unpaywall: boolean;
}
export interface RetrievalConfig {
    elsevier_api: boolean;
    springer_oa_api: boolean;
    wiley_tdm: boolean;
    europe_pmc_fulltext: boolean;
    browser_assisted: boolean;
    manual_import: boolean;
}
export interface IntegrationsConfig {
    zotero: boolean;
}
export interface BrowserConfig {
    auto_save_state: boolean;
    state_directory: string;
}
export interface TokenBudgetConfig {
    abstract_first_triage: boolean;
    max_fulltext_tokens: number;
}
export interface AppConfig {
    discovery: DiscoveryConfig;
    retrieval: RetrievalConfig;
    integrations: IntegrationsConfig;
    browser: BrowserConfig;
    token_budget: TokenBudgetConfig;
    paths: PathConfig;
}
/**
 * Load configuration from config.toml, falling back to defaults for
 * any missing section or key.
 */
export declare function loadConfig(configPath?: string): AppConfig;
/** Return the list of enabled discovery source names. */
export declare function enabledDiscoverySources(config: AppConfig): string[];
/**
 * Return the subset of enabled discovery sources that support keyword search.
 * Unpaywall is DOI lookup only, so it should not be exposed via search tools.
 */
export declare function enabledSearchDiscoverySources(config: AppConfig): string[];
/** Return the list of enabled retrieval route names. */
export declare function enabledRetrievalRoutes(config: AppConfig): string[];
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