deepseek-ai/deepseek-harness · error

url must be a non-empty string

Error message

url must be a non-empty string

What it means

Error "url must be a non-empty string" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/web/tool-web/src/fetch.ts:89

    const row = node as HTMLTableRowElement
    const border = isTableHeadingRow(row)
      ? Array.from(row.cells, (cell, index) => renderTableCell(tableBorder(cell), index)).join('')
      : ''
    return `\n${content}${border.length > 0 ? `\n${border}` : ''}`
  },
})

/**
 * Validate value constraints the schema DSL can't express: a non-blank `url`.
 * Throws a plain `Error` otherwise. No timeout parameter — the tool-call budget
 * is deployment policy declared via `fetchTimeoutMs` config and enforced by
 * `@deepseek-ai/dsh-tool-call-timeout-policy`, not a model argument.
 *
 * @param args - the schema-validated `web_fetch` arguments.
 * @returns the arguments as the seam's request fields.
 */
export function parseFetchArgs(args: { url: string }): { url: string } {
  if (args.url.trim().length === 0) throw new Error('url must be a non-empty string')
  return { url: args.url }
}

/**
 * Nesting-depth ceiling above which HTML skips conversion and passes through
 * raw. Conversion runs synchronously on the event loop, and unclosed-tag
 * nesting makes domino's tree (and turndown's walk over it) superlinear —
 * measured: depth 512 ≈ 0.15s, 2,000 ≈ 2s, 20,000 ≈ 5s — during which the
 * cooperative `fetchTimeoutMs` timer cannot fire. Real pages nest a few dozen
 * levels; 512 is far above content and far below weaponizable. A robustness
 * invariant, not a tunable.
 */
const MAX_CONVERSION_DEPTH = 512

/** Elements that never take a closing tag, so they do not grow the lexical stack. */
const VOID_ELEMENTS = new Set([
  'area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input',
  'link', 'meta', 'param', 'source', 'track', 'wbr',

View on GitHub (pinned to b150a551b8)

Solutions

1. Pass a non-empty url string.

When it happens

Trigger: Thrown at packages/web/tool-web/src/fetch.ts:89 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/6e14eb6a036a1a57. Report an issue: GitHub.