Export	Used by	Purpose
`maskPiiInText`, `maskPiiInValue`, `PII_PATTERNS`	security-proxy	Mask TC Kimlik No, VKN, IBAN, card, phone, email, provider API keys, private keys, connection strings and JWTs in tool results; an optional replacer turns matches into tokens
`SpanLookup`, `ModelDetector`, `MODEL_PII`	@guardbee/ner, pii-bench	Mask what a model found (person names, via `@guardbee/ner`) in the same pass: run the model over the strings first, then pass a lookup as `maskPiiInText`'s fifth argument. A lookup must throw for a text it has no result for, so an unscanned text is never passed as clean. `person_name` is a detector name in the `ALL`, `KVKK` and `IDENTITY` presets; without a lookup it finds nothing
`SECRET_RULES`	secret-scanner, security-proxy	76 secret rules (provider keys and tokens — cloud, AI providers, developer tools, SaaS, Turkish payment and SMS providers — private keys, connection strings, JWT). The scanner reports all of them; the proxy masks the 66 that are not marked `broad`
`isValidTcKimlik`, `isValidVkn`, `isValidIban`, `isValidLuhn`, `isValidTrPhone`	security-proxy, prompt-leak-scanner	Validation after a regex match
`INJECTION_RULES`, `findInjections`	prompt-injection-scanner, security-proxy	27 injection rules in English and Turkish, with base64-decoding; the scanner uses the 17 precise ones
`scanForPromptInjection`, `scanToolResult`	security-proxy	Block on a precise high/critical rule, warn on anything else
`gatewayPolicySchema`, `validatePolicy`, `policyShape`	security-proxy, app.guardbee.ai	The gateway policy document (labels, rules, taint, approval, defaults, interceptors). The dashboard validates an edit with it before saving, so a policy that saves is one the proxy accepts
`classifyTool`, `CAPABILITY_RULES`	toxic-flow-auditor, security-proxy	Label a tool as untrusted-content / sensitive-data / exfiltration / destructive (lethal trifecta)

Checksum-validated masking

A regex alone masks any 11-digit number as a TC Kimlik No and any 16-digit number as a card. Each match is now checked before it is masked:

Pattern	Check
TC Kimlik No	Official 10th/11th digit algorithm
VKN (tax number)	Gelir İdaresi check digit, and a `VKN` / `Vergi No` label before the number
IBAN	ISO 7064 MOD97-10
Card number	Luhn
Phone (TR)	Mobile (5xx), landline (2xx–4xx) or 850 code; written with a +90 / 0 prefix or grouped with spaces/dashes, and not part of a URL or id

A match that fails its check (an order number, a tracking code) is left unchanged.

Precise and broad rules

Injection and secret rules carry a broad flag for patterns that also match ordinary text: "act as", "developer mode", any 40-character base64 run, a publishable Stripe key. Static scanners that show a finding to a person skip broad injection rules; the runtime proxy never blocks or masks on a broad rule, because a false match there would also mark the session as holding sensitive data or stop a legitimate call.