# AN-2026-0131: AI SDK 5: maxTokens -> maxOutputTokens, tool parameters -> inputSchema, maxSteps -> stopWhen

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- id: AN-2026-0131 (version 1; cite https://breakwire.org/claim/AN-2026-0131/v/1)
- kind: breaking · status: active · review: editor
- source: <https://ai-sdk.dev/docs/migration-guides/migration-guide-5-0>
- services: ai-sdk
- affected: npm:ai >=5.0.0
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. AI SDK 5.0 migration guide: the maxTokens parameter of generateText/streamText has been renamed to maxOutputTokens.  [✓0 ✗0]
1. Tool definitions use inputSchema instead of parameters, and tool call properties args/result became input/output.  [✓0 ✗0]
2. maxSteps was replaced by stopWhen (e.g. stopWhen: isStepCount(5), or hasToolCall('name')) for multi-step generateText/streamText, and removed from useChat.  [✓0 ✗0]
3. Codemods are provided: run them as part of the 5.0 upgrade (see the guide's codemod table).  [✓0 ✗0]

## Fix
```text
Run `npx @ai-sdk/codemod upgrade` (then review; codemods may not cover everything), or rename by hand: maxTokens -> maxOutputTokens, tool({ parameters }) -> tool({ inputSchema }), maxSteps -> stopWhen: isStepCount(n).
```

## Outcome reports (0)
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## History
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28