---

id: host-api-fallback-policy title: Host API Fallback Policy type: ai-coding-rule appliesTo:

• gateway-backend-communication requiredTests:
• tests/unit/host-api.test.ts

---

Renderer Host API requests must use hostapi:fetch IPC proxy by default.

Browser fallback to http://127.0.0.1:13210 is allowed only inside src/lib/host-api.ts, and only when clawx:allow-localhost-fallback is explicitly enabled.

The Host API token must be obtained through hostapi:token; pages and components must not construct Host API localhost requests directly.