# AN-2026-0873: AI SDK 7 tool context: experimental_context is now context, filled per tool from toolsContext (contextSchema); shared data moved to runtimeContext; TS2339 on experimental_context

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- id: AN-2026-0873 (version 1; cite https://breakwire.org/claim/AN-2026-0873/v/1)
- kind: breaking · status: active · review: editor
- source: <https://ai-sdk.dev/docs/migration-guides/migration-guide-7-0#:~:text=has%20been%20renamed%20to%20context%20and%20is%20now%20stable>
- 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 tool callback option experimental_context was renamed to context and is now stable, and that AI SDK now separates tool-specific context (passed to each tool from toolsContext, keyed by tool name and typed by the tool's contextSchema) from shared generation / agent data (runtimeContext).  [✓0 ✗0]
1. The guide lists the breaking cases: destructuring experimental_context in tool callbacks; one shared object used for orchestration and tools (split it into runtimeContext and toolsContext); top-level context in generateText / streamText / ToolLoopAgent and prepareStep's context renamed to runtimeContext; fields not declared in contextSchema become TypeScript errors; toolsContext becomes required once any tool declares contextSchema.  [✓0 ✗0]
2. Reproduced 2026-11-04 with ai 7.0.163 and tsc 5: a tool execute callback that destructures { experimental_context } gives error TS2339: Property 'experimental_context' does not exist on type 'ToolExecutionOptions<...>'.  [✓0 ✗0]

## Fix
```text
Rename `experimental_context` to `context` in tool callbacks (codemod rename-experimental-context-to-context), declare `contextSchema` on tools that need data, pass it as `toolsContext: { toolName: {...} }`, and move shared state to `runtimeContext` (also in prepareStep).
```

## Error signatures
- substring: `Property 'experimental_context' does not exist on type 'ToolExecutionOptions<NoInfer<Context>> | ToolExecutionOptions<Context>'.` (tsc 5 TS2339 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