import { type CompatTag } from "./validation.js";
/**
 * Capability flags — the per-feature compatibility layer (MAIN-SCOPE §9,
 * architecture/websocket-protocol.md § Capability flags / Compatibility rules).
 *
 * Two directions:
 *  - `CLIENT_CAPS` (client → daemon, advertised in `hello.capabilities`): the daemon stores these
 *    per connection so the wire boundary can ask one question, `supports(caps, flag)`. New wire
 *    enum values are gated through this so an old client never receives a value it didn't advertise.
 *  - `SERVER_FEATURES` (daemon → client, in `server_info.features.*`): new *features* advertise a
 *    flag; clients either run the feature or show "update the host." No degraded fallback path.
 */
export declare const CLIENT_CAPS: {
    /** Client renders custom per-mode icons. */
    readonly custom_mode_icons: "custom_mode_icons";
    /** Client understands the merged reasoning stream enum value. */
    readonly reasoning_merge_enum: "reasoning_merge_enum";
    /** Client can consume a reflowable terminal snapshot payload. */
    readonly terminal_reflowable_snapshot: "terminal_reflowable_snapshot";
    /** Client renders markdown images (`![alt](path)`) whose target is a local filesystem path. */
    readonly inline_image_markdown: "inline_image_markdown";
    /** Client renders markdown links (`[label](path)`) whose target is a local filesystem path as an open-file action. */
    readonly file_link_markdown: "file_link_markdown";
    /** Client renders `language-mermaid` fenced code blocks as a live diagram (flowcharts, sequence diagrams, etc.). */
    readonly mermaid_diagram_markdown: "mermaid_diagram_markdown";
};
export type ClientCapabilityKey = keyof typeof CLIENT_CAPS;
export type ClientCapability = (typeof CLIENT_CAPS)[ClientCapabilityKey];
export declare const SERVER_FEATURES: {
    readonly providersSnapshot: "providersSnapshot";
    readonly checkoutGithubSetAutoMerge: "checkoutGithubSetAutoMerge";
    readonly daemonStatusRpc: "daemonStatusRpc";
    readonly "terminal-restore-modes": "terminal-restore-modes";
    readonly checkoutRefresh: "checkoutRefresh";
    readonly extensionPacks: "extensionPacks";
    readonly providerAuth: "providerAuth";
    readonly extensionUi: "extensionUi";
    readonly thinkingLevels: "thinkingLevels";
    readonly viewerSettings: "viewerSettings";
    readonly forkTimelineSync: "forkTimelineSync";
};
export type ServerFeatureKey = keyof typeof SERVER_FEATURES;
export type ServerFeature = (typeof SERVER_FEATURES)[ServerFeatureKey];
/**
 * COMPAT annotations for each server feature flag (version added + removal date). The removal dates
 * are placeholders to be confirmed against the live `ServerInfoStatusPayloadSchema`. Grep `COMPAT(`
 * to enumerate cleanup work.
 */
export declare const SERVER_FEATURE_COMPAT: Record<ServerFeatureKey, CompatTag>;
/** The forms a stored capability set can take on the daemon session. */
export type CapabilitySet = Record<string, boolean> | readonly string[] | Set<string> | undefined;
/**
 * Returns true only if `flag` is advertised by `caps`. Used at serialization time to gate new wire
 * enum values: `if (session.supports(CLIENT_CAPS.reasoning_merge_enum)) emit(newValue) else emit(old)`.
 */
export declare function supports(caps: CapabilitySet, flag: string): boolean;
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