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Implement MCP 2026-07-28 (#2286)

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Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
Co-authored-by: Konstantin Konstantinov <KKonstantinov@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Felix Weinberger 2026-06-26 14:01:10 +01:00 • committed by GitHub
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# mrtr (multi-round-trip requests)
A write-once `deploy` tool that requests client input by **returning** `inputRequired(...)` instead of pushing a server→client request (protocol revision 2026-07-28). State between rounds is carried in `requestState`, which the example HMAC-protects and verifies via the
`ServerOptions.requestState.verify` hook (a wire-level `-32602` on tamper).
The client drives both the default auto-fulfilment mode (your existing `elicitation/create` handler is dispatched for you and `callTool()` returns a plain `CallToolResult`) and manual mode (`autoFulfill: false` + `allowInputRequired: true`).
```bash
pnpm tsx examples/mrtr/client.ts
```