Jev x AI SDK Form Router
Three forms use Jev and AI SDK to route submissions by context.
Tech Stack
Technology
Purpose
Next.js 16 and React 19
Components and styling
App Router, shared form UI, and Server Actions
shadcn/ui, Base UI, and Tailwind CSS 4
React Email and Resend
AI SDK 7 and Vercel AI Gateway
Three forms use Jev to route submissions by context, with openai/gpt-5.6-luna-fast handling uncertain or failed evaluations. Includes editable samples, routing details, and optional email delivery.
Typed model calls and provider access
Email previews and optional delivery
Getting Started
Prerequisites
1. Clone and install
3
pnpminstall
2 cd jev-ai-sdk-form-router
2. Configure AI Gateway
- Node.js 22+
- pnpm package manager
1 git clone https://github.com/vercel-labs/jev-ai-sdk-form-router.git
Routing a submission, including a sample, makes live model calls and requires AI Gateway access to both typesafe-ai/jev and openai/gpt-5.6-luna-fast. Choose one of the authentication options below, or skip this step to explore the forms and load sample inputs without generating routing results.
API Key
Copy the environment example:
1 cp .env.example .env.local
Create a Vercel AI Gateway key and set AI_GATEWAY_API_KEY in .env.local.
Vercel OIDC
Vercel deployments use automatic OIDC authentication through the SDK, without an API key. To use OIDC locally, install the Vercel CLI if needed, then link the project and pull its environment variables:
2 vercel link
3. Start the app
3 vercel env pull .env.local
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Example
Lead
Route
/leads
Routes to
Startup, growth, enterprise, or sales teams
Contact
Issue Report
/contact
/issues
Billing, support, or general inquiries
Frontend, platform, infrastructure, identity, or engineering teams
- Zod validates the submission against the fields in lib/examples.ts.
- Jev evaluates the complete submission using AI SDK’s experimental_evaluate and selects an allowed team/specialty combination.
- The app accepts Jev’s choice when its confidence is at least 95%.
- If confidence is lower, missing, or invalid, or Jev fails, openai/gpt-5.6-luna-fast independently evaluates the same submission and criteria using generateText and Output.object. Its choice becomes final.
- The result includes the destination, deciding model, Jev statistics, model timings, and an email preview.
Customization
Confidence and selected-option probability are separate metrics. The threshold uses the unrounded value of providerMetadata.typesafe.confidence.destination. Jev’s displayed statistics remain attached to its original evaluation when the fallback model makes the final decision.
Provider calls have bounded timeouts and one transient retry. If both models fail, the app returns a retryable error and sends no email.
Set up Resend through Vercel Marketplace
File
What to change
Receiving inboxes
Form fields, samples, destinations, and routing criteria
Models, confidence threshold, timeouts, and fallback policy
components/router-form.tsx and components/routing-result.tsx
Email design
Validation, email rendering, and delivery workflow
Shared form and result UI
Checks
Keep the experimental AI SDK version pinned and rerun the checks when upgrading it.
3 pnpm build # Production build
Tests mock the model providers and Resend. They make no external calls. Coverage includes confidence thresholds, fallback decisions, validation, recipient configuration, and delivery retries.
2 pnpm validate # Lint, type check, Knip, and tests
1 pnpm fix # Format and apply lint fixes
