extension families

The x/* ecosystem. Capability outside the kernel.

7 beta families with APIs frozen between release refs. 7 experimental families for product capability work. All separated cleanly from the zero-dependency stable core.

9 stable roots — zero external deps

7 beta families — API frozen between refs

7 experimental families — evaluate before adopting

Beta

API frozen between release references. Safe to adopt with awareness of beta stability semantics.

x/gatewaybeta

Reverse proxy, upstream health, load balancing, and route composition at the service edge.

proxyedgelb

Read primer →

x/observabilitybeta

Prometheus metrics, OpenTelemetry traces, and structured log exporters wired at the service boundary.

metricstracesotel

Read primer →

x/restbeta

CRUD resource conventions, typed handlers, and REST response contracts over the stable HTTP kernel.

apirestcrud

Read primer →

x/websocketbeta

Full-duplex WebSocket connections managed by a hub, coexisting with standard HTTP routes.

realtimews

Read primer →

x/tenantbeta

Per-tenant JWT identity, quota enforcement, and policy evaluation at the transport layer.

saasmulti-tenantjwt

Read primer →

x/frontendbeta

Static asset serving, SPA fallback routing, and embedded filesystem support for frontend integration.

staticspaassets

Read primer →

x/messagingbeta

Event publishing, webhook dispatch, and messaging service-level API over pluggable transports.

eventspubsubwebhooks

Read primer →

Experimental

APIs may change between releases. Evaluate maturity evidence in the primer before adopting in production.

x/fileapiexperimental

Multipart upload handlers, chunk resumption, and file metadata management over the stable HTTP kernel.

uploadfilesmultipart

Read primer →

x/openapiexperimental

OpenAPI 3 spec generation from route definitions, with schema inference and doc server.

openapiswaggerdocs

Read primer →

x/resilienceexperimental

Circuit breakers, retry policies, and timeout wrappers for outbound HTTP and service calls.

resiliencecircuit-breakerretry

Read primer →

x/rpcexperimental

gRPC + HTTP dual-protocol service wiring that shares the same stable middleware chain.

grpcrpcprotocol

Read primer →

x/dataexperimental

File storage, idempotency keys, and data access primitives above the stable store interface.

storagedatafiles

Read primer →

x/aiexperimental

Multi-provider AI abstraction, session lifecycle, streaming SSE responses, and tool-call routing.

aillmstreaming

Read primer →

x/validateexperimental

Request body validation middleware with struct tag rules and structured error responses.

validationinput

Read primer →