Moving to withMcpAuth from Vercel's mcp-handler #20
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GPT-5's comment on why this does work with SSE: SSE transport in mcp-handler fails with "Could not convert argument of type symbol to string" error even with minimal auth context (no user data). HTTP transport works perfectly with the same configuration. The error occurs in the mcp-remote client's SSE EventSource implementation when trying to serialize data, suggesting a bug in the SSE transport layer rather than user data serialization issues. |
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This works auth wise but gives SSE errors on passing user information in the auth flow. Just a validation of what could be done for the moment.