1  import type { ValidationResult } from 'src/Tool.js'
 2  import { isClaudeSettingsPath } from '../permissions/filesystem.js'
 3  import { validateSettingsFileContent } from './validation.js'
 4  
 5  /**
 6   * Validates settings file edits to ensure the result conforms to SettingsSchema.
 7   * This is used by FileEditTool to avoid code duplication.
 8   *
 9   * @param filePath - The file path being edited
10   * @param originalContent - The original file content before edits
11   * @param getUpdatedContent - A closure that returns the content after applying edits
12   * @returns Validation result with error details if validation fails
13   */
14  export function validateInputForSettingsFileEdit(
15    filePath: string,
16    originalContent: string,
17    getUpdatedContent: () => string,
18  ): Extract<ValidationResult, { result: false }> | null {
19    // Only validate Claude settings files
20    if (!isClaudeSettingsPath(filePath)) {
21      return null
22    }
23  
24    // Check if the current file (before edit) conforms to the schema
25    const beforeValidation = validateSettingsFileContent(originalContent)
26  
27    if (!beforeValidation.isValid) {
28      // If the before version is invalid, allow the edit (don't block it)
29      return null
30    }
31  
32    // If the before version is valid, ensure the after version is also valid
33    const updatedContent = getUpdatedContent()
34    const afterValidation = validateSettingsFileContent(updatedContent)
35  
36    if (!afterValidation.isValid) {
37      return {
38        result: false,
39        message: `Claude Code settings.json validation failed after edit:\n${afterValidation.error}\n\nFull schema:\n${afterValidation.fullSchema}\nIMPORTANT: Do not update the env unless explicitly instructed to do so.`,
40        errorCode: 10,
41      }
42    }
43  
44    return null
45  }