> ## Documentation Index
> Fetch the complete documentation index at: https://praison.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Expression Condition • AI Agent SDK

> ExpressionCondition: String-based condition evaluator for expressions like 'score  80'.

# ExpressionCondition

> Defined in the [**evaluator**](../modules/evaluator) module.

<Badge color="blue">AI Agent</Badge>

String-based condition evaluator for expressions like "\{\{score}} > 80".

Supports:

* Numeric comparison: "\{\{var}} > 80", "\{\{var}} >= 50", "\{\{var}} \< 10"
* String equality: "\{\{var}} == approved", "\{\{var}} != rejected"
* Contains check: "error in \{\{message}}", "\{\{status}} contains success"
* Boolean: "\{\{flag}}" (truthy check)
* Nested property: "\{\{item.score}} >= 60"

## Constructor

<ParamField query="expression" type="str" required={true}>
  No description available.
</ParamField>

## Methods

<CardGroup cols={2}>
  <Card title="evaluate()" icon="function" href="../functions/ExpressionCondition-evaluate">
    Evaluate the condition against the given context.
  </Card>
</CardGroup>

## Usage

```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
cond = ExpressionCondition("{{score}} > 80")
    result = cond.evaluate({"score": 90})  # True
```

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/conditions/evaluator.py#L17">
  `praisonaiagents/conditions/evaluator.py` at line 17
</Card>