---
title: raygeo.ops.assembly.callbacks
sidebar_label: raygeo.ops.assembly.callbacks
---

Per-node callback bridge types.

## ChunkPayload

Python-visible chunk payload. Mirrors `ChunkPayload`.

### `message`

```python
message: str
```

### `y_end`

```python
y_end: int
```

### `y_start`

```python
y_start: int
```
