/**
 * The vocabulary a tool uses to say what its call and result *are*, so a UI can decide
 * what they look like.
 *
 * A tool that returns markup has picked a renderer, a theme, and a layout on the UI's
 * behalf, and it does so in the one place — the model-facing result — where UI concerns do
 * not belong. Declaring an intent instead keeps the two apart: the tool names the shape of
 * what it did, and each surface renders that shape its own way.
 *
 * Two rules make this work, and both bite when broken:
 *
 * - **A view is a pure function of the call's arguments** (plus, for a result view, the
 *   result). These are computed on a live call *and* again when a log is replayed, so
 *   reading a file, the clock, or session state makes a replay disagree with what the user
 *   originally saw. A `diff` view built at call time uses `oldText: null` for a create
 *   precisely because a caller has no prior content to read.
 * - **An unrecognised card degrades, it never throws.** A surface that does not implement
 *   `diff` still shows the title and the raw input. Display must not be able to break a
 *   replay, so `<r-tool-card>` treats anything it does not recognise as `generic`.
 */
/** A file position a tool touched, so a capable editor can follow along. */
export interface ToolLocation {
    path: string;
    /** 1-based line, when the tool knows one. */
    line?: number;
}
/** One file a tool creates or modifies. */
export interface ToolDiff {
    path: string;
    /** Prior content, or null when the tool is creating the file. */
    oldText: string | null;
    newText: string;
}
/**
 * The one line a collapsed call shows beside its title.
 *
 * Optional and worth setting. The element derives one when it is absent — the first
 * argument, the command, the first path — but only the tool knows which of its arguments
 * is the one a reader scanning a run of calls needs to see. `fetch_url` wants the address;
 * a tool with six arguments wants whichever names the thing it acted on.
 */
interface ToolSummary {
    summary?: string;
}
/** The pending card, derived from a call's arguments. */
export type ToolCallView = (ToolSummary & {
    card: 'generic';
    title: string;
    /** Icon hint — `read`, `search`, and so on. Unknown values fall back to no icon. */
    kind?: string;
    /** Arguments worth showing, already stringified by the producer. */
    input?: Record<string, string>;
    locations?: ToolLocation[];
}) | (ToolSummary & {
    card: 'terminal';
    title: string;
    description?: string;
    cwd?: string;
}) | (ToolSummary & {
    card: 'diff';
    title: string;
    diffs: ToolDiff[];
    locations?: ToolLocation[];
});
/** The completed card, replacing the pending one. */
export type ToolResultView = {
    card: 'generic';
    title?: string;
    content?: string;
} | {
    card: 'terminal';
    output: string;
    exitCode?: number;
} | {
    card: 'diff';
    diffs: ToolDiff[];
};
/** Lifecycle of the call the card shows. */
export type ToolCardStatus = 'running' | 'success' | 'error';
export {};