deepseek-ai/deepseek-harness · error · Error

pattern must be a non-empty string

Error message

pattern must be a non-empty string

What it means

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

Source

Thrown at packages/fs/tool-fs-search/src/grep.ts:91

    if (char === '{') braceDepth++
    else if (char === '}') braceDepth = Math.max(0, braceDepth - 1)
    else if (char === ',' && braceDepth === 0) {
      throw new Error('include must be one glob, not a comma-separated list (use {a,b} alternation instead)')
    }
  }
}

/**
 * Validate value constraints the schema DSL can't express: a non-EMPTY
 * `pattern` (whitespace is a legitimate regex), a non-blank `path` when given,
 * and a single positive `include` glob ({@link GrepInput}). Throws a plain
 * `Error` (an ordinary tool argument error) otherwise.
 *
 * @param args - the schema-validated `grep` arguments.
 * @returns the accepted input, unchanged.
 */
export function parseGrepArgs(args: { pattern: string; path?: string; include?: string }): GrepInput {
  if (args.pattern.length === 0) throw new Error('pattern must be a non-empty string')
  if (args.path !== undefined && args.path.trim().length === 0) throw new Error('path must be a non-empty string when given')
  if (args.include !== undefined) validateInclude(args.include)
  return {
    pattern: args.pattern,
    ...args.path !== undefined ? { path: args.path } : {},
    ...args.include !== undefined ? { include: args.include } : {},
  }
}

/**
 * Build the fixed line-oriented `rg --json` argv for one `grep` call. Every
 * model-controlled value ({@link GrepInput.pattern}, {@link GrepInput.path},
 * {@link GrepInput.include}) is a plain argv element — no shell layer exists,
 * so no quoting applies; the pattern and include ride in `--flag=value` form
 * and the target behind `--`, so a leading-dash value can never be parsed as
 * a flag.
 *
 * @param input - the validated arguments.

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/fs/tool-fs-search/src/grep.ts:91 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/1e6108e468d323b2. Report an issue: GitHub.