---
title: Go Packages
description: Package reference for all Nexus Go packages.
---

## Core

| Package | Import | Description |
|---------|--------|-------------|
| nexus | `github.com/xraph/nexus` | Gateway, Engine, Config, Options |
| id | `github.com/xraph/nexus/id` | TypeID prefixes and constructors |
| plugin | `github.com/xraph/nexus/plugin` | Extension interfaces and Registry |

## Providers

| Package | Import | Description |
|---------|--------|-------------|
| provider | `github.com/xraph/nexus/provider` | Provider interface, Request/Response |
| openai | `github.com/xraph/nexus/providers/openai` | OpenAI provider |
| anthropic | `github.com/xraph/nexus/providers/anthropic` | Anthropic provider |
| opencompat | `github.com/xraph/nexus/providers/opencompat` | OpenAI-compatible provider |

## Pipeline

| Package | Import | Description |
|---------|--------|-------------|
| pipeline | `github.com/xraph/nexus/pipeline` | Middleware chain builder |
| middlewares | `github.com/xraph/nexus/pipeline/middlewares` | Built-in middleware |
| router | `github.com/xraph/nexus/router` | Routing service |
| strategies | `github.com/xraph/nexus/router/strategies` | Routing strategies |

## Features

| Package | Import | Description |
|---------|--------|-------------|
| guard | `github.com/xraph/nexus/guard` | Guardrail interface and service |
| guards | `github.com/xraph/nexus/guard/guards` | Built-in guards |
| cache | `github.com/xraph/nexus/cache` | Cache interface and service |
| stores | `github.com/xraph/nexus/cache/stores` | Cache backends |
| transform | `github.com/xraph/nexus/transform` | Input/output transforms |
| model | `github.com/xraph/nexus/model` | Alias registry and token counting |

## Infrastructure

| Package | Import | Description |
|---------|--------|-------------|
| store | `github.com/xraph/nexus/store` | Persistence interface |
| memory | `github.com/xraph/nexus/store/memory` | In-memory store |
| sqlite | `github.com/xraph/nexus/store/sqlite` | SQLite store |
| postgres | `github.com/xraph/nexus/store/postgres` | PostgreSQL store |
| tenant | `github.com/xraph/nexus/tenant` | Tenant entity and service |
| key | `github.com/xraph/nexus/key` | API key management |
| usage | `github.com/xraph/nexus/usage` | Usage tracking |
| auth | `github.com/xraph/nexus/auth` | Auth provider interface |

## Extensions

| Package | Import | Description |
|---------|--------|-------------|
| audit_hook | `github.com/xraph/nexus/audit_hook` | Audit event recording |
| observability | `github.com/xraph/nexus/observability` | Metrics and tracing |
| relay_hook | `github.com/xraph/nexus/relay_hook` | Webhook relay |
| extension | `github.com/xraph/nexus/extension` | Forge extension adapter |

## Utilities

| Package | Import | Description |
|---------|--------|-------------|
| proxy | `github.com/xraph/nexus/proxy` | OpenAI-compatible HTTP proxy |
| api | `github.com/xraph/nexus/api` | Forge HTTP handlers |
| fallback | `github.com/xraph/nexus/fallback` | Circuit breaking and retry |
| batch | `github.com/xraph/nexus/batch` | Batch processing |
| mcp | `github.com/xraph/nexus/mcp` | Model Context Protocol |