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fix: correct MCPServer call_tool result type (#2816)

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Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
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冯基魁 2026-06-20 22:56:16 +08:00 • committed by GitHub
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docs/migration.md
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@ -8,6 +8,17 @@ Version 2 of the MCP Python SDK introduces several breaking changes to improve t
## Breaking Changes
### `MCPServer.call_tool()` returns `CallToolResult`
`MCPServer.call_tool()` now always returns a `CallToolResult`. It previously
advertised `Sequence[ContentBlock] | dict[str, Any]` and leaked the internal
conversion shapes (a bare content sequence or a `(content, structured_content)`
tuple), forcing callers to re-assemble a `CallToolResult` themselves.
If you call `MCPServer.call_tool()` directly, read `.content` and
`.structured_content` off the returned `CallToolResult` instead of branching on
the result type.
### `streamablehttp_client` removed
The deprecated `streamablehttp_client` function has been removed. Use `streamable_http_client` instead.