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The spec never uses the phrase "structured output". It defines two separate things under Tool Result: "Structured Content" (the `structuredContent` field) and "Output Schema" (the `outputSchema` field). Collapsing them into "structured output" conflates the two. It is also actively confusing here. In LLM tooling "structured output" means constrained decoding — making the *model* emit conforming JSON. These clients call a model API, so a reader could reasonably take the phrase to mean the tool constrains the model's response, which is the opposite of what is going on: the tool describes the shape of its own result. Headings and prose now say "structured content". References to real identifiers are left alone: the Python SDK's own docs page is called Structured Output and lives at docs/servers/structured-output.md, and its decorator parameter is `structured_output`. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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9 lines
762 B
Markdown
# An LLM-Powered Chatbot MCP Client written in Go
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See the [Build an MCP client](https://modelcontextprotocol.io/docs/develop/build-client) tutorial for more information.
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## Structured content
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The SDK does not validate tool output, so this client compiles each declared `outputSchema` at connect time and checks results against it — the spec's client-side SHOULD. It uses [`jsonschema-go`](https://pkg.go.dev/github.com/google/jsonschema-go/jsonschema), already an SDK dependency.
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The two channels go to different readers: `Content` is forwarded to the model, while `StructuredContent` is used as data — the client counts the items it returns. See [Structured Content](https://modelcontextprotocol.io/specification/draft/server/tools#structured-content).
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