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Add resolver dependency injection for MCPServer tools (#2969)

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Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>
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Marcelo Trylesinski 2026-06-29 12:51:46 +02:00 • committed by GitHub
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docs/migration.md
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@ -1624,6 +1624,20 @@ app = server.streamable_http_app(
The lowlevel `Server` also now exposes a `session_manager` property to access the `StreamableHTTPSessionManager` after calling `streamable_http_app()`.
### `ElicitationResult` is now a subscriptable generic alias
`ElicitationResult` is now a `TypeAliasType` instead of a plain union, so `ElicitationResult[Confirm]` works as an annotation (resolver dependency injection consumes it that way - see [Dependencies](tutorial/dependencies.md)). The members are unchanged: `AcceptedElicitation[T] | DeclinedElicitation | CancelledElicitation`.
The one behavioral change: a runtime `isinstance(result, ElicitationResult)` now raises `TypeError`. Check against the member classes directly instead:
```python
result = await ctx.elicit("Proceed?", Confirm)
if isinstance(result, AcceptedElicitation):
... # result.data is a Confirm
```
Narrowing on `result.action` (`"accept"` / `"decline"` / `"cancel"`) is unaffected.
## Need Help?
If you encounter issues during migration: