Function validateScript

src/node/services/tools/bash.ts:498–528

* Validates bash script input for common issues * Returns error result if validation fails, null if valid

(script: string, config: ToolConfiguration)

 * Returns error result if validation fails, null if valid
 */
function validateScript(script: string, config: ToolConfiguration): BashToolResult | null {
  // Check for empty script
  if (!script || script.trim().length === 0) {
    return {
      success: false,
      error: "Script parameter is empty. This likely indicates a malformed tool call.",
      exitCode: -1,
      wall_duration_ms: 0,
    };
  }

  // Detect redundant cd to working directory
  const cdPattern = /^\s*cd\s+['"]?([^'";&|]+)['"]?\s*[;&|]/;
  const match = cdPattern.exec(script);
  if (match) {
    const targetPath = match[1].trim();
    const normalizedTarget = config.runtime.normalizePath(targetPath, config.cwd);
    const normalizedCwd = config.runtime.normalizePath(".", config.cwd);

    if (normalizedTarget === normalizedCwd) {
      return {
        success: false,
        error: `Redundant cd to working directory detected. The tool already runs in ${config.cwd} - no cd needed. Remove the 'cd ${targetPath}' prefix.`,
        exitCode: -1,
        wall_duration_ms: 0,
      };
    }
  }

  return null; // Valid
}

/**
 * Rewrite cmd.exe-style null-device redirects (e.g. `>nul`, `2>nul`) into `/dev/null`.