A bug in the Model Context Protocol (MCP) implementation in mcp-go caused a 45-second deadlock for tool calls that required user input. The issue arose because the server incorrectly sent elicitation requests (which require user input) over a separate GET stream instead of the primary POST stream. This routing mismatch led to a circular wait: the client was blocked waiting for the POST response, while the server was blocked waiting for the client to process the elicitation on the GET stream. The bug has been fixed in a pull request, but the underlying issue highlights potential complexities with MCP's Streamable HTTP transport, especially with the upcoming spec release. AI
IMPACT This bug fix in the Model Context Protocol implementation could improve the reliability of AI agent tool calls that require user interaction.
RANK_REASON Bug report and fix for a specific software implementation.
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