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trpc

Corrects the wrong defaults a model has for tRPC v11 (verified against 11.18.0). Use when code imports initTRPC, createTRPCContext, createTRPCOptionsProxy, createTRPCReact, httpBatchLink, httpSubscriptionLink, fetchRequestHandler, or TRPCError, or when building routers, procedures, middleware, links, or RSC prefetching. Covers the v10 to v11 drift that makes stale code fail — the React client that flipped to @trpc/tanstack-react-query, transformers moving into links, renamed type exports, observable subscriptions replaced by async generators over SSE — plus the defaults that are unsafe rather than merely stale — uncapped batching, CDN cache headers that serve one user's data to another, stack traces shipped from edge runtimes, and middleware that runs before input validation. NOT for TanStack Query semantics generally (use tanstack-query), Zod schema authoring (use zod), or Next.js App Router routing (use nextjs).

skills/.experimental/trpc/SKILL.md

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Aug 15, 2026
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Observed agent integration: codex

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# tRPC v11

The decisions tRPC forces and how to settle them, written so an agent applies them while writing or reviewing code. Every rule names the wrong default it corrects; there is no rule for what the model already gets right.

**Pinned to tRPC v11, verified against `11.18.0` (2026-06-17).** There is no v12 — but several APIs here carry `@deprecated … will be removed in v12` and still ship today. Peers: `typescript >=5.7.2`, `@tanstack/react-query ^5.80.3`, `react >=18.2.0`.

## When to Apply

Use this skill when:

- Code imports `initTRPC`, `createTRPCContext`, `createTRPCOptionsProxy`, `createTRPCReact`, `createTRPCClient`, `httpBatchLink`, `httpSubscriptionLink`, `splitLink`, `fetchRequestHandler`, `createCallerFactory`, or `TRPCError` — or defines procedures with `.input()` / `.output()` / `.use()` / `.query()` / `.mutation()` / `.subscription()`
- The user says "everything types as `any`", "invalidation isn't working", "`contextMap[utilName] is not a function`", "the transformer property moved", "414 / 413 on the dashboard", "subscriptions won't connect", "the prefetch isn't hydrating", or "it 404s every procedure"
- Migrating a codebase from tRPC v10, or reviewing tRPC code written against v10-era examples — the highest-yield moment, because the recommended React client changed and stale code often still compiles
- Adding the first subscription, the first file upload, or the first RSC prefetch to an existing router — each crosses into a surface where v11 replaced the v10 approach outright