MCP's Default stdio Transport Breaks Remote Deployments; HTTP Transport Fixes It

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A developer building a LangGraph and MCP-based support bot discovered that the bot worked locally but lost context and gave irrelevant responses when deployed remotely. The root cause was MCP's default stdio transport, which relies on standard input/output streams and only functions correctly when client and server run on the same machine. Switching to MCP's Streamable HTTP transport resolved the issue by enabling message exchange over HTTP across different machines. However, the HTTP transport requires a stable connection, and developers are advised to implement retry logic — such as Python's tenacity library — to handle reconnections if the link drops. The author plans to cover scalability and fault-tolerance strategies for agentic AI systems in a follow-up post.

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