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fix(mcp): disable deprecated SSE transport — GHB-189 #97

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Merged
Gastonfoncea merged 1 commit into from
May 17, 2026
Merged

fix(mcp): disable deprecated SSE transport — GHB-189 #97

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13 changes: 11 additions & 2 deletions apps/mcp/app/api/mcp/[transport]/route.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,14 @@
// Public MCP endpoint. The dynamic route segment `[transport]` is
// `sse` for Streamable HTTP transport. Tools are registered by
// `lib/tools/register.ts`; this file is just the framework shell.
// `mcp` for the Streamable HTTP transport (the only one we support).
// Tools are registered by `lib/tools/register.ts`; this file is just
// the framework shell.
//
// SSE is intentionally disabled (GHB-189). It was removed from the MCP
// spec on 2025-03-26 (see mcp-handler types) and `mcp-handler`'s SSE
// handler hard-requires a TCP Redis URL — without it the handler
// throws before flushing any HTTP headers, which surfaces to clients
// as a 0-byte connection that hangs until they time out. With
// `disableSse: true` the same path returns a clean 404 instead.

import { createMcpHandler } from "mcp-handler";
import { registerAllTools } from "@/lib/tools/register";
Expand All @@ -16,6 +24,7 @@ const handler = createMcpHandler(
},
{
basePath: "/api/mcp",
disableSse: true,
}
);

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