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PatternsSDK API
Tool Call Repair
Tool Call Repair
Repair invalid tool calls using experimental_repairToolCall. Fix schema validation errors without requiring additional steps that pollute message history.
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Problems solved
Technical challenges this implementation handles out of the box.
- Repair malformed tool calls before retrying execution
- Fix schema validation errors with generateObject
- Avoid polluting message history with extra repair turns
- Stream repair metadata to the client as data parts
Use cases
Products and workflows this pattern is designed to support.
- Agents using smaller models that misformat tool args
- Complex Zod schemas that fail first-pass validation
- Automatic tool-call error recovery
- Improving tool success rates in production agents
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
streamTextconvertToModelMessagestooluseChatexperimental_repairToolCallgenerateObjectNoSuchToolErrorProviders
OpenAI
Files added
7 filesapp/page.tsxapp/layout.tsxapp/api/tool-repair/route.tscomponents/tool-repair-demo.tsxlib/types.tstools/weather.tstools/weather-ui.tsx
Dependencies
14 totalnpm packages
7AISDKshadcn/uilucide-reactNext.jsReactstreamdownZod
Registry components
alertemptyinput-groupseparatormessage-scrollermessagebubble
Critical files
tool-repair/route.tsAPI route implementing experimental_repairToolCall. When a tool call fails validation, uses generateObject with the tool's inputSchema to repair malformed input. Demonstrates streaming repair metadata via data parts.
tools/weather.tsWeather tool with strict Zod schema designed to trigger repair scenarios. Includes repair state detection via experimental_context.
Requirements
- Complexity
- Intermediate
- Setup time
- ~5 minutes
- Node
- 24+
- Memory
- 512MB
