# System Operator Library


The system operator library contains the platform's built-in processing operators for selecting operator types and versions in workflow nodes. It is located in the **system catalog in Catalog** and is **read-only**.

## System Operator List

| System operator | Purpose |
| --- | --- |
| Document Parsing | Parse document files |
| Image Parsing | Parse images |
| Audio Parsing | Parse audio |
| Video Parsing | Parse video |
| Chunking | Split text |
| Text Embedding | Generate vectors |
| Cleansing | Clean data |
| Information Extraction | Extract structured information |
| Dataset Generation | Generate datasets |

Open an operator's details in Catalog / system catalog to view its type, current version, creation and update information, description, input / parameter / output definitions, and **version history** (version number, date, and change description; the current version is highlighted).

## Versions and Workflows

- A workflow node can be pinned to an operator version. When the platform upgrades a system operator, **the behavior of workflows bound to an existing version remains unchanged**.
- To use new behavior, explicitly switch the version on the node and perform regression testing.
- After an operator is imported to the agent side through a snapshot, it can appear as a tool. See the [Glossary](glossary.md) for the concept.

## Custom Operators (Boundary)

The system library cannot be modified. Place business-specific operators in a regular Catalog directory:

| Method | Description |
| --- | --- |
| Save from a workflow | Convert a code node, such as SQL or Python, into an operator and specify its directory and database |
| Write directly in Catalog | Create an operator in a database and maintain its metadata |

Common custom-operator metadata includes identifier (English), language (Python / SQL / Go, and others), description, parameter signature (name / type / required / default), and version history. A custom operator can be published as an API or used as an agent tool (see Guide · Catalog / Data Processing for instructions).