feat(mcp): Support stateless SDK v2 handlers#1165
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Co-Authored-By: OpenAI Codex <noreply@openai.com> Co-Authored-By: David Cramer <david@sentry.io>
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Co-Authored-By: OpenAI Codex <codex@openai.com> Co-Authored-By: David Cramer <david@sentry.io>
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July 17, 2026 23:58
Co-Authored-By: OpenAI Codex <codex@openai.com> Co-Authored-By: David Cramer <david@sentry.io>
Co-Authored-By: OpenAI Codex <codex@openai.com>
Co-Authored-By: OpenAI Codex <noreply@openai.com> Co-Authored-By: David Cramer <david@sentry.io>
Co-Authored-By: OpenAI Codex <noreply@openai.com> Co-Authored-By: David Cramer <david@sentry.io>
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Upgrade the hosted MCP endpoint to Cloudflare Agents' new stateless SDK v2 handler while preserving the existing SDK v1 server path for stdio and other consumers.
Dual SDK server construction
buildServernow defaults to the existing@modelcontextprotocol/sdkv1 server and can explicitly construct an@modelcontextprotocol/serverv2 server for draft-protocol handlers. The Cloudflare endpoint passes a server factory tocreateMcpHandler, giving every request a fresh server instance as required by the new handler contract.Pinned beta dependency set
Pins
agents@canva,@modelcontextprotocol/server@2.0.0-beta.4, and@modelcontextprotocol/sdk@1.29.0. Supporting React and AI SDK peers are updated to versions accepted by the canva build. The endpoint also restricts browser Origins to its serving hostname.The v2 SDK and draft MCP protocol remain beta; these pins should be revisited when Cloudflare publishes the stable Agents release.
Requested by David Cramer via Junior.
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