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The surrounding sentence names 2026-07-28 as the revision that first allows an array-rooted schema, but the link pointed at /draft, which moves on to the next revision and stops matching the claim. Came in with #164. The same fix is on the open Go, Rust, and Ruby branches. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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A Simple MCP Weather Server written in Python
See the Build an MCP server tutorial for more information.
Structured content
Both tools declare an output schema and return structured_content. get_forecast returns an object; get_alerts returns a top-level JSON array, which protocol revision 2026-07-28 is the first to allow — see Structured Content in the spec.
Alerts is a RootModel[list[Alert]] rather than a plain list[Alert] because the SDK wraps non-object return types as {"result": ...}; a RootModel is taken as the schema exactly as written. See Structured Output in the SDK docs.
Note that an array-rooted schema requires a 2026-07-28 client. This SDK does not project it down for older ones — it raises instead.