# Plugins

This directory contains the plugin mechanism for RAGFlow.

RAGFlow will load plugins from `embedded_plugins` subdirectory recursively.

## Supported plugin types

Currently, the only supported plugin type is `llm_tools`.

- `llm_tools`: A tool for LLM to call.

## How to add a plugin

Add a LLM tool plugin is simple: create a plugin file, put a class inherits the `LLMToolPlugin` class in it, then implement the `get_metadata` and the `invoke` methods.

- `get_metadata` method: This method returns a `LLMToolMetadata` object, which contains the description of this tool.
The description will be provided to LLM, and the RAGFlow web frontend for displaying.

- `invoke` method: This method accepts parameters generated by LLM, and return a `str` containing the tool execution result.
All the execution logic of this tool should go into this method.

When you start RAGFlow, you can see your plugin was loaded in the log:

```
2025-05-15 19:29:08,959 INFO     34670 Recursively importing plugins from path `/some-path/ragflow/plugin/embedded_plugins`
2025-05-15 19:29:08,960 INFO     34670 Loaded llm_tools plugin BadCalculatorPlugin version 1.0.0
```

Or it may contain some errors for you to fix your plugin.

### Demo

We will demonstrate how to add a plugin with a calculator tool which will give wrong answers.

First, create a plugin file `bad_calculator.py` under the `embedded_plugins/llm_tools` directory.

Then, we create a `BadCalculatorPlugin` class, extending the `LLMToolPlugin` base class:

```python
class BadCalculatorPlugin(LLMToolPlugin):
    _version_ = "1.0.0"
```

The `_version_` field is required, which specifies the version of the plugin.

Our calculator has two numbers `a` and `b` as inputs, so we add a `invoke` method to our `BadCalculatorPlugin` class:

```python
def invoke(self, a: int, b: int) -> str:
    return str(a + b + 100)
```

The `invoke` method will be called by LLM. It can have many parameters, but the return type must be a `str`.

Finally, we have to add a `get_metadata` method, to tell LLM how to use our `bad_calculator`:

```python
@classmethod
def get_metadata(cls) -> LLMToolMetadata:
    return {
        # Name of this tool, providing to LLM
        "name": "bad_calculator",
        # Display name of this tool, providing to RAGFlow frontend
        "displayName": "$t:bad_calculator.name",
        # Description of the usage of this tool, providing to LLM
        "description": "A tool to calculate the sum of two numbers (will give wrong answer)",
        # Description of this tool, providing to RAGFlow frontend
        "displayDescription": "$t:bad_calculator.description",
        # Parameters of this tool
        "parameters": {
            # The first parameter - a
            "a": {
                # Parameter type, options are: number, string, or whatever the LLM can recognise
                "type": "number",
                # Description of this parameter, providing to LLM
                "description": "The first number",
                # Description of this parameter, provding to RAGFlow frontend
                "displayDescription": "$t:bad_calculator.params.a",
                # Whether this parameter is required
                "required": True
            },
            # The second parameter - b
            "b": {
                "type": "number",
                "description": "The second number",
                "displayDescription": "$t:bad_calculator.params.b",
                "required": True
            }
        }
```

The `get_metadata` method is a `classmethod`. It will provide the description of this tool to LLM.

The fields starts with `display` can use a special notation: `$t:xxx`, which will use the i18n mechanism in the RAGFlow frontend, getting text from the `llmTools` category. The frontend will display what you put here if you don't use this notation.

Now our tool is ready. You can select it in the `Generate` component and try it out.