[Bug]: Streamable HTTP Translation Feature: Connects but Fails to List Tools, Resources, or Support Tool Calls

[kevalmahajan]

🐞 Bug Summary

The Streamable HTTP translation feature (translating stdio server to a streamable HTTP server) is only partially implemented. While the connection is successfully established, no further functionality works. Listing tools, resources, prompts, or calling tools is non-functional.

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🧩 Affected Component

Select the area of the project impacted:

• mcpgateway - API
• mcpgateway - UI (admin panel)
• mcpgateway.wrapper - stdio wrapper
• Federation or Transports
• CLI, Makefiles, or shell scripts
• Container setup (Docker/Podman/Compose)
• Other (explain below)

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🔁 Steps to Reproduce

1. Execute this command to start a stdio server with streamable http transport:
   python3 -m mcpgateway.translate --stdio "npx @modelcontextprotocol/server-everything" --port 9000 --expose-streamable-http --expose-sse
2. Add the server in either mcp-context-forge gateway or MCP Inspector.
3. Click Connect, then attempt to list tools, resources, or prompts.
4. Observe that the connection is established, but no tools, resources, or prompts are listed, and tool invocation does not work. In the gateway, the connection will fail because the server does not provide any tools or resources.

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🤔 Expected Behavior

After establishing the connection via streamable-http, the server should successfully list available tools, resources, and prompts. Additionally, invoking tools through the gateway or inspector should work correctly without errors.

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📓 Logs / Error Output

The server fails to connect in the gateway, but in translate server logs we can see 200, 202 OK responses

INFO:     127.0.0.1:48482 - "POST /mcp HTTP/1.1" 200 OK
INFO:     127.0.0.1:44874 - "POST /mcp HTTP/1.1" 200 OK

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🧠 Environment Info

You can retrieve most of this from the /version endpoint.

Key	Value
Version or commit	e.g. v0.9.0 or main@a1b2c3d
Runtime	e.g. Python 3.11, Gunicorn
Platform / OS	e.g. Ubuntu 22.04, macOS
Container	e.g. Docker, Podman, none

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🧩 Additional Context (optional)

Add any configuration details, flags, or related issues.