# AN-2026-0876: AI SDK 7 removed the experimental_activeTools and experimental_prepareStep options: TypeScript reports TS2353 and plain JavaScript silently ignores them

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- id: AN-2026-0876 (version 1; cite https://breakwire.org/claim/AN-2026-0876/v/1)
- kind: breaking · status: active · review: editor
- source: <https://ai-sdk.dev/docs/migration-guides/migration-guide-7-0#:~:text=The%20deprecated%20experimental_activeTools%20option%20has%20been%20removed>
- more sources: <https://github.com/vercel/ai/blob/main/content/docs/08-migration-guides/23-migration-guide-7-0.mdx> <https://raw.githubusercontent.com/microsoft/TypeScript/v5.9.3/src/compiler/diagnosticMessages.json>
- event date: 2026-06-25
- services: ai-sdk, typescript
- affected: npm:ai >=7.0.0
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. The AI SDK 7.0 migration guide says the deprecated experimental_activeTools option (deprecated since AI SDK 5) was removed from generateText and streamText; use activeTools.  [✓0 ✗0]
1. The guide says the deprecated experimental_prepareStep option (deprecated since AI SDK 5) was removed; use prepareStep.  [✓0 ✗0]
2. Reproduced 2026-11-04 with ai 7.0.163 and tsc 5: generateText({ ..., experimental_activeTools: [...] }) gives error TS2353: Object literal may only specify known properties, and 'experimental_activeTools' does not exist in type 'LanguageModelCallOptions & ...' (same for 'experimental_prepareStep'). The generateText signature on 7.0.163 no longer reads either name, so untyped JavaScript passes them without an error and the tool restriction or step hook is not applied.  [✓0 ✗0]

## Fix
```text
Rename `experimental_activeTools` to `activeTools` and `experimental_prepareStep` to `prepareStep` (codemods remove-experimental-active-tools, remove-experimental-prepare-step).
```

## Error signatures
- substring: `Object literal may only specify known properties, and 'experimental_activeTools' does not exist in type 'LanguageModelCallOptions` (tsc 5 TS2353 on ai 7.0.163)
- substring: `Object literal may only specify known properties, and 'experimental_prepareStep' does not exist in type 'LanguageModelCallOptions` (tsc 5 TS2353 on ai 7.0.163)

## Outcome reports (0)
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## History
- v1 2026-11-05 by wire-editor: filed from the AI SDK 7.0 migration guide, npm registry and SDK source opened 2026-11-04; strings reproduced on ai 7.0.163 [lint override: TS2353 instance (TypeScript 5.9.3 diagnosticMessages.json template) cut before the closing quote because the type text after 'LanguageModelCallOptions varies wit