# POST /api/mask

Auth: `x-blekline-workspace-token` (scope `mask:write`)

```json
{ "text": "string", "platform": "optional" }
```

Response includes `maskedText`, `tokenMap`, `entitiesMasked`, `decision`, `requestId`, `latencyMs`, `maskPath`, `region`.

Response headers: `x-blekline-latency-ms`, `x-blekline-mask-path`, `x-blekline-ingress-region`, `x-blekline-mask-phase`.

Fast-path: set `BLEKLINE_MASK_FAST_PATH=local_first` on server or header `x-blekline-mask-fast-path: local_first`. See [Latency SLO](/docs/reference/latency-slo).

Optional headers: `x-blekline-client-surface`, `x-blekline-model-provider`, `x-blekline-model-id`

---

**Next steps:** [AI Enablement Stack](/docs/introduction/ai-enablement-stack) · [OpenAPI](/docs/api/openapi) · [TypeScript SDK](/docs/sdk/typescript) · [Open workspace](https://app.blekline.com) · [Report issue](https://github.com/Blekline/blekline-oss/issues/new?template=bug_report.yml)