> ## 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.

# Enable Injection Defense • AI Agents Framework

> enable_injection_defense: Enable prompt injection defense globally for all agents.

# enable\_injection\_defense

<div className="flex items-center gap-2">
  <Badge color="teal">Function</Badge>
</div>

> This function is defined in the [**security**](../modules/security) module.

Enable prompt injection defense globally for all agents.

Registers hooks on BEFORE\_TOOL and BEFORE\_AGENT events that scan
inputs through a 6-check pipeline and block critical threats.

## Signature

```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
def enable_injection_defense(extra_patterns: Optional[List[str]], block_threshold: Optional[int], trusted_sources: Optional[List[str]]) -> str
```

## Parameters

<ParamField query="extra_patterns" type="Optional" required={false}>
  Additional regex patterns to detect (appended to defaults).
</ParamField>

<ParamField query="block_threshold" type="Optional[int]" required={false}>
  Override the threat level that triggers blocking. 3 = CRITICAL, 2 = HIGH (default), 1 = MEDIUM.
</ParamField>

<ParamField query="trusted_sources" type="Optional" required={false}>
  Source names that bypass blocking (in addition to defaults).
</ParamField>

### Returns

<ResponseField name="Returns" type="str">
  \{"before\_tool": str, "before\_agent": str}
</ResponseField>

## Usage

```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
>>> from praisonai.security import enable_injection_defense
    >>> enable_injection_defense()
```

## Uses

* `ThreatLevel`
* `InjectionDefense`
* `add_hook`
* `defense.create_hook`
* `defense.create_agent_hook`

## Used By

* [`enable_security`](../functions/enable_security)

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai/praisonai/security/__init__.py#L85">
  `praisonai/security/__init__.py` at line 85
</Card>