Call Options: prepareCall

Dynamically configure one ToolLoopAgent per request with callOptionsSchema and prepareCall. A customer-support agent rewrites instructions, gates tools, tunes reasoning effort, and injects RAG context based on account tier and urgency.

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Problems solved

Technical challenges this implementation handles out of the box.

Configure one ToolLoopAgent per request with prepareCall
Inject per-user RAG context into instructions at runtime
Gate tools by account tier with activeTools
Tune reasoning effort from request urgency

Use cases

Products and workflows this pattern is designed to support.

Multi-tier customer support agents
Per-user RAG injection
Role-based tool access
Runtime provider option selection

Setup

Requirements, wiring steps, and what this pattern adds to your project.

Getting started

Pick how you want to pull this pattern in — then wire env vars and routes the same way.

1
Install from the preview toolbar
Copy the install command above and run it in your project — Pro patterns include a short-lived token.
2
Add environment variables to .env.local
OPENAI_API_KEY
3
Point client fetches at your API routes
Replace preview `/view/.../api/...` paths with `/api/...` in the installed files.
4
Customize the agent and tool files
Adapt prompts, tools, and stop conditions for your product — Copy for AI in the toolbar helps seed that work.
5
Run your dev server and open the pattern route
Install dependencies if needed, then start the app and verify responses.

Environment variables

OPENAI_API_KEYGet key

Capabilities

AI SDK APIs

ToolLoopAgentcallOptionsSchemaprepareCallactiveToolsproviderOptionstoolgateway

Providers

OpenAI

Files added

10 files

app/page.tsx
app/layout.tsx
app/api/support/route.ts
components/call-options-demo.tsx
components/prepared-config-display.tsx
lib/support-agent.ts
lib/customer-data.ts
tools/get-plan-limits.ts
tools/create-ticket.ts
README.md

Dependencies

13 total

npm packages

AISDKlucide-reactNext.jsReactZod

Registry components

alertbadgebuttoncardcollapsibleinputskeletontabs

Critical files

lib/support-agent.ts
Core pattern: ToolLoopAgent with callOptionsSchema (zod) and prepareCall that returns modified instructions, activeTools, and providerOptions from runtime options. prepareCall can be async for RAG.
support/route.ts
Calls agent.generate({ prompt, options }) with the required, type-checked call options and returns the resolved config plus the answer.
lib/customer-data.ts
Client-safe tier config + fake knowledge base and keyword retrieval used by prepareCall to inject RAG context.