orpc

oRPC

Use this skill to build and review oRPC code against the official documentation.

What it is: oRPC (OpenAPI Remote Procedure Call) defines and calls remote/local procedures through an end-to-end type-safe API that also adheres to the OpenAPI spec. Official docs: https://orpc.dev. Repo: https://github.com/unnoq/orpc.

How to use the references

oRPC ships LLM-friendly docs, not a code skill. Every reference below is a Markdown rendering of a docs page (.md suffix). Fetch only the pages relevant to the task.

• Index of all pages: https://orpc.dev/llms.txt
• Full docs in one file (large): https://orpc.dev/llms-full.txt
• Any docs URL works as Markdown by appending .md (e.g. https://orpc.dev/docs/router.md).

Workflow

1. Identify the surface: contract, router/procedure, handler (RPC vs OpenAPI), client (server-side vs link), or integration.
2. Read only the relevant reference page(s) below — append .md, don't guess APIs.
3. Prefer contract-first when client and server are separate packages; co-located code can use the router directly.
4. Match the project's existing handler and serializer choices before introducing new ones.
5. Validate type-safety end to end; throw Error instances, never literals.

Core Concepts

• Getting Started
• Procedure
• Router
• Middleware
• Context
• Metadata
• Error Handling
• Event Iterator (SSE)
• File Upload and Download
• Server Action
• Comparison vs other RPC/REST

Contract First

• Define Contract
• Implement Contract
• Router to Contract

Handlers

• RPC Handler
• OpenAPI Handler
• OpenAPI Routing
• OpenAPI Specification

Clients

• Server-Side Clients
• Client-Side Clients
• RPCLink
• DynamicLink
• Client Error Handling
• Client Event Iterator

Adapters (server framework hosting)

• HTTP · Next.js · Hono · Express · Fastify
• WebSocket · Message Port · Electron · Browser
• Full adapter list (Astro, Elysia, H3, Nuxt, Remix, Solid Start, SvelteKit, TanStack Start, React Native, Web/Worker Threads): see llms.txt

Plugins

• CORS · Request Validation · Response Validation
• Batch Requests · Dedupe Requests · Client Retry
• Body Limit · Compression · Simple CSRF Protection · Strict GET Method

Integrations

• TanStack Query
• AI SDK
• Better Auth
• OpenTelemetry
• Sentry
• Pino logging
• tRPC interop · NestJS

Best Practices

• Monorepo Setup
• Optimize SSR
• Dedupe Middleware
• No Throw Literal

Advanced

• Building Custom Plugins
• Testing & Mocking
• RPC Protocol
• RPC JSON Serializer · SuperJson
• Validation Errors
• Publish Client to NPM
• Migrating from tRPC

Guardrails

• Don't invent API surface — fetch the relevant .md page; oRPC's API is versioned and changes between majors.
• Throw Error instances, never literal values (oRPC error flow + type inference depend on it).
• Keep contract and implementation types in sync; let the contract drive client types.
• Respect the project's existing handler/serializer/adapter choices instead of mixing them.