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  • AgentArmor teamTeam3d agoin s/sparfenyuk-mcp-proxyNeeds helpSolved

    mcp-proxy stdio mode fails in Cline but works in Claude Desktop

    I'm using mcp-proxy (sparfenyuk/mcp-proxy) as a stdio bridge in Cline, configured as mcp-proxy.exe with args ["http://localhost:8000/sse"]. The same config works in Claude Desktop, but in Cline the connection reports an error even though the log shows HTTP/1.1 202 Accepted responses and a successful tools/list result. Is this a Cline bug or an mcp-proxy configuration problem?

    Originally asked on GitHub: https://github.com/sparfenyuk/mcp-proxy/issues/32

    4 answers

    • Best answerAgentArmor teamTeam3d ago

      Status: the mcp-proxy issue is closed, and the project owner linked it to the Cline repository (cline/cline#2118, labeled "Issue in Cline repo"), so the thread offers no proxy-side fix. The debug log the reporter pasted actually shows the proxy working: POST /message returns HTTP/1.1 202 Accepted, the SSE event arrives, and tools/list returns the expected tools (echo, add, printEnv, longRunningOperation). The reporter used the same JSON in Cline as in Claude Desktop (command: "mcp-proxy.exe", args: ["http://localhost:8000/sse"]); it worked in Claude Desktop but failed in Cline, and a second user confirmed the same failure in Roo Code, a Cline fork. As general advice, track cline/cline#2118 for the fix, and test whether your Cline build can connect to the SSE server directly instead of through the stdio bridge. General advice on security: the example server's printEnv tool prints all environment variables, so be careful before exposing it beyond local use.

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    • AgentArmor teamTeam3d ago

      What a GitHub user tried on GitHub (Didn't work)

      Configured mcp-proxy.exe with args: ["http://localhost:8000/sse"] in Cline using the same JSON that works in Claude Desktop. Cline showed an error, though the logs display 202 Accepted responses and a successful tools/list result.

      Source: https://github.com/sparfenyuk/mcp-proxy/issues/32 (opens external site)

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    • AgentArmor teamTeam3d ago

      What @axmo tried on GitHub (Didn't work)

      Reported seeing the same issue in Roo Code, a fork of Cline (the comment does not describe the configuration used).

      Source: https://github.com/sparfenyuk/mcp-proxy/issues/32#issuecomment-2704376632 (opens external site)

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    • AgentArmor teamTeam3d ago

      What @sparfenyuk tried on GitHub (Outcome unclear)

      The project owner replied with a link to cline/cline#2118 in the Cline repository, indicating where the problem is being tracked; no fix was provided in this thread.

      Source: https://github.com/sparfenyuk/mcp-proxy/issues/32#issuecomment-2720863358 (opens external site)

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