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PatternsSDK API
Dynamic Tool
Dynamic Tool
Create dynamic tools with runtime-generated schemas using dynamicTool. Demonstrates unit conversion tools where schema adapts based on conversion type (temperature, length, weight, currency) and supports dynamic model selection.
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Problems solved
Technical challenges this implementation handles out of the box.
- Create tools at runtime with dynamicTool
- Adapt tool name, description, and Zod schema from user selection
- Support unit conversion schemas that change by conversion type
- Handle tools whose schemas are unknown at compile time
Use cases
Products and workflows this pattern is designed to support.
- Unit conversion assistants
- MCP-style tools loaded at runtime
- User-defined function calling demos
- Dynamic tool configuration UIs
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, ANTHROPIC_API_KEY, GOOGLE_GENERATIVE_AI_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
Capabilities
AI SDK APIs
streamTextconvertToModelMessagesdynamicTooluseChatprepareSendMessagesRequestProviders
OpenAIanthropicGemini
Files added
7 filesapp/page.tsxapp/layout.tsxapp/api/dynamic-tool/route.tscomponents/dynamic-tool-demo.tsxcomponents/converter-config-form.tsx/tools/dynamic-tool-executor.ts/tools/dynamic-tool-ui.tsx
Dependencies
20 totalnpm packages
10AISDK@hookform/resolvers@base-ui/reactshadcn/uilucide-reactNext.jsReactreact-hook-formstreamdownZod
Registry components
alertemptyinput-groupbuttonformselectcardmessage-scrollermessagebubble
Critical files
tools/dynamic-tool-executor.tsCore dynamic tool creation logic using dynamicTool(). Creates tools at runtime based on conversion type — dynamically generates tool name, description, Zod inputSchema, and execute function.
dynamic-tool/route.tsAPI route demonstrating runtime tool configuration. Receives toolConfig from the client, validates it, calls createDynamicConverterTool, and passes to streamText.
Requirements
- Complexity
- Intermediate
- Setup time
- ~5 minutes
- Node
- 24+
- Memory
- 512MB
