server-plugins

Development

Framework server plugins and the `/_agent-native/` route namespace. Use when adding a custom server plugin, deciding whether to create an `/api/` route vs an action, or debugging auto-mounted framework routes.

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Server Plugins & Framework Routes

Default Plugins (auto-mount)

Five default plugins auto-mount when your app doesn't have a custom version in server/plugins/:

Plugin	Default behavior	Customize when
`agent-chat`	Agent chat endpoints	Custom `mentionProviders` or `systemPrompt`
`auth`	Auth middleware	Custom `publicPaths` or Google OAuth config
`core-routes`	`/_agent-native/poll`, `/_agent-native/ping`, etc	Custom `envKeys` or `sseRoute`
`resources`	Resource CRUD	Rarely
`terminal`	Terminal emulator	Rarely

Only create plugin files for plugins you need to customize. Let defaults auto-mount.

Framework Route Namespace: `/_agent-native/`

All framework-level routes live under /_agent-native/ to avoid collisions with template-specific /api/* routes.

Hard rule

ALL framework routes go under /_agent-native/.
Templates own /api/* only for route-only domain concerns such as uploads, streaming, webhooks, OAuth callbacks, or non-JSON protocols.
Never put framework routes under /api/.
Never put template routes under /_agent-native/ — that namespace is reserved.
Never create /api/* routes that only wrap, proxy, or re-export actions. Use the existing /_agent-native/actions/:name endpoint or the React action hooks.

Auto-mounted framework routes

Route	Purpose
`GET /_agent-native/poll`	Polling endpoint for DB change detection
`GET /_agent-native/events`	SSE endpoint for real-time sync
`GET /_agent-native/ping`	Health check
`GET/PUT/DELETE /_agent-native/application-state/:key`	Application state CRUD
`GET/PUT/DELETE /_agent-native/application-state/compose/:id`	Compose draft CRUD
`POST /_agent-native/agent-chat`	Agent chat SSE endpoint
`GET /_agent-native/agent-chat/mentions`	Mention search for @-tagging
`GET /_agent-native/env-status`	Env key configuration status
`POST /_agent-native/env-vars`	Save env vars
`/_agent-native/auth/*`	Authentication (login, session, logout)
`/_agent-native/google/*`	Google OAuth (callback, auth-url, etc.)
`/_agent-native/resources/*`	Resource CRUD
`/_agent-native/actions/:name`	Auto-mounted action endpoints
`/_agent-native/available-clis`	Available CLI tools
`/_agent-native/agent-terminal-info`	Terminal connection info
`/_agent-native/collab/*`	Real-time collaboration (see `real-time-collab`)
`/_agent-native/a2a`	A2A JSON-RPC endpoint (see `a2a-protocol`)

Actions-First Approach

For standard CRUD and data operations, use defineAction in actions/ — the framework auto-mounts them as HTTP endpoints at /_agent-native/actions/:name. Only create custom /api/* routes for things actions can't do:

File uploads with multipart form data
Streaming responses
Webhooks from external services
OAuth callbacks

Before adding a route, inspect the existing action files. Reuse the action if it already encodes the business rule, or add a new action if the operation should be available to both the agent and the UI. A route whose implementation mostly calls an action is usually the wrong abstraction.

The Nitro Vite plugin handles both /api/ and /_agent-native/ prefixes via file-based routing in server/routes/.

Related Skills

actions — Prefer actions over custom /api/ routes
authentication — Auth middleware and session handling
portability — Use H3 (not Express) for all routes