List every cell with a one-line source preview (cheap overview).

Returns index, type, source_preview, num_lines, has_outputs for each cell. Cell indices are 0-based. Call this first to orient before editing.

Read one cell's full source (and outputs/execution_count for code cells).

Outputs are read-only: no tool writes them, and editing a code cell's source clears its stale outputs.

Insert a new cell BEFORE index (index == cell count appends).

cell_type must be one of: code, markdown, raw. Indices are 0-based.

Replace a cell's ENTIRE source. For small changes prefer patch_cell.

Editing a code cell clears its outputs and execution_count (they are stale).

Preferred edit tool: replace a unique old substring with new in a cell.

old must occur exactly once in the cell; otherwise this errors and asks for more context. Keeps diffs small. Editing a code cell clears its outputs.

Delete the cell at index (0-based).

Move the cell at from_index to to_index (final position, 0-based).