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/**
* Pure argument validation for the youtube_transcript tool — input → output, no I/O.
*
* Validates that args is an object with a non-empty `url` string. Does NOT
* validate URL format — the transcriber service handles that (mirrors the
* opencode youtube-subtitles tool's contract). Returns the URL string on
* success or `{ error }` for invalid input, so the tool surfaces the message
* verbatim as an `isError` result.
*/
export type ValidationError = { readonly error: string };
/**
* Validate raw tool args. Returns the URL string, or `{ error }` for invalid
* input — the tool surfaces the message verbatim.
*/
export function validateUrl(args: unknown): string | ValidationError {
if (args === null || args === undefined || typeof args !== "object") {
return { error: "Error: Arguments must be an object with a 'url' string." };
}
const obj = args as Record<string, unknown>;
const raw = obj.url;
if (typeof raw !== "string") {
return { error: "Error: 'url' is required and must be a string." };
}
if (raw.trim().length === 0) {
return { error: "Error: 'url' must not be empty." };
}
return raw;
}
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