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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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# dual-era
One server factory, both protocol eras (2025 `initialize` and 2026-07-28 per-request envelope), both transports (stdio and Streamable HTTP). The client connects once as a plain 2025 client and once with `versionNegotiation: { mode: 'auto' }`; the same `greet` tool answers both
and reports which era served the call.
This is the recommended **first** example to read if you are migrating an existing server to the 2026 era: the entry (`serveStdio` / `createMcpHandler`) owns the era decision, the factory is era-agnostic.
```bash
pnpm tsx examples/dual-era/client.ts # stdio
pnpm tsx examples/dual-era/server.ts --http --port 3000 # term 1
pnpm tsx examples/dual-era/client.ts --http http://127.0.0.1:3000/ # term 2
```