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

# Server-Side Redaction

> Automatic PII detection and redaction powered by Microsoft Presidio.

In addition to [client-side redaction](/privacy-security/client-side-redaction), AgentCat employs Microsoft Presidio on our servers to automatically detect and redact sensitive information that might have been missed by client-side filters.

## Microsoft Presidio Integration

Our servers run every incoming event through a locally run Microsoft Presidio advanced PII detection engine, which identifies and redacts:

* **Personal Identifiers**: Names, addresses, phone numbers, email addresses
* **Financial Information**: Credit card numbers, bank account details, routing numbers
* **Government IDs**: Social security numbers, passport numbers, driver's license numbers
* **Medical Information**: Patient IDs, medical record numbers
* **Custom Patterns**: Additional sensitive data patterns defined by AgentCat

## How it works

1. **Automatic Detection**: Presidio analyzes all text fields in incoming events
2. **Context-Aware Redaction**: Uses NLP to understand context and reduce false positives
3. **Configurable Sensitivity**: Detection thresholds tuned to minimize false positives
4. **Audit Trail**: Maintains logs of redaction actions for compliance purposes

## Configuration

Server-side redaction is **enabled by default** for all projects. You can toggle this per project in **Settings > Projects > Edit > "Redact sensitive strings"**.

<Note>
  Toggling the setting only affects new events. Previously stored events are not modified.
</Note>