Your redaction filter works. Are you quite sure?

Tyk AI Studio’s Enterprise-only filters can inspect and modify requests before they reach an AI model or block responses after generation, with request-side filters being appropriate for redacting personal data before it leaves the gateway. A supplied Tengo-based PII redaction template uses regular expressions to replace emails, phone numbers, and Social Security numbers while preserving the surrounding prompt, but multiple redaction passes must correctly reuse the rewritten message payload. The built-in Test Script panel enables free server-side testing of filter logic, output contracts, and syntax without sending traffic to a provider, although it supplies an empty messages array, does not display compliance events, and may not accurately represent production metadata. Testing revealed that the default Social Security number expression failed to match space-separated values, which was corrected by allowing either spaces or hyphens. After saving, filters must be attached to the relevant provider and configuration must be pushed to the gateway before live traffic is affected; sync status can be delayed and should be verified through an actual request. A live echo test confirmed that redacted values reached the gateway but not the model, while the article notes that filters do not prevent AI Studio proxy logs from capturing unfiltered request bodies, requiring a separate provider setting to avoid logging them.

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