> ## Documentation Index > Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-a46887cf.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # ContentFilterBuiltinEntry - Go SDK > ContentFilterBuiltinEntry type definition The Go SDK and docs are currently in beta. Report issues on [GitHub](https://github.com/OpenRouterTeam/go-sdk/issues). A builtin content filter entry. Builtin filters include PII detectors and the regex-based prompt injection detector. ## Fields | Field | Type | Required | Description | Example | | -------- | -------------------------------------------------------------------------------------------------------- | -------------------- | --------------------------------------------------------------------------------------------------------------------------------- | ---------------------- | | `Action` | [components.ContentFilterBuiltinAction](/client-sdks/go/api-reference/models/contentfilterbuiltinaction) | :heavy\_check\_mark: | Action taken when the builtin filter triggers | block | | `Label` | `*string` | :heavy\_minus\_sign: | Read-only, system-assigned redaction placeholder derived from the slug (e.g. "\[EMAIL]", "\[PHONE]"). Not settable by the caller. | \[EMAIL] | | `Slug` | [components.ContentFilterBuiltinSlug](/client-sdks/go/api-reference/models/contentfilterbuiltinslug) | :heavy\_check\_mark: | The builtin filter identifier | regex-prompt-injection |