Function call

src/tools/NotebookEditTool/NotebookEditTool.ts:295–489

(
    {
      notebook_path,
      new_source,
      cell_id,
      cell_type,
      edit_mode: originalEditMode,
    },
    { readFileState, updateFileHistoryState },
    _,
    parentMessage,
  )

    return { result: true }
  },
  async call(
    {
      notebook_path,
      new_source,
      cell_id,
      cell_type,
      edit_mode: originalEditMode,
    },
    { readFileState, updateFileHistoryState },
    _,
    parentMessage,
  ) {
    const fullPath = isAbsolute(notebook_path)
      ? notebook_path
      : resolve(getCwd(), notebook_path)

    if (fileHistoryEnabled()) {
      await fileHistoryTrackEdit(
        updateFileHistoryState,
        fullPath,
        parentMessage.uuid,
      )
    }

    try {
      // readFileSyncWithMetadata gives content + encoding + line endings in
      // one safeResolvePath + readFileSync pass, replacing the previous
      // detectFileEncoding + readFile + detectLineEndings chain (each of
      // which redid safeResolvePath and/or a 4KB readSync).
      const { content, encoding, lineEndings } =
        readFileSyncWithMetadata(fullPath)
      // Must use non-memoized jsonParse here: safeParseJSON caches by content
      // string and returns a shared object reference, but we mutate the
      // notebook in place below (cells.splice, targetCell.source = ...).
      // Using the memoized version poisons the cache for validateInput() and
      // any subsequent call() with the same file content.
      let notebook: NotebookContent
      try {
        notebook = jsonParse(content) as NotebookContent
      } catch {
        return {
          data: {
            new_source,
            cell_type: cell_type ?? 'code',
            language: 'python',
            edit_mode: 'replace',
            error: 'Notebook is not valid JSON.',
            cell_id,
            notebook_path: fullPath,
            original_file: '',
            updated_file: '',
          },
        }
      }

      let cellIndex
      if (!cell_id) {
        cellIndex = 0 // Default to inserting at the beginning if no cell_id is provided