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What a 401 Means to an MCP Client

This story is from 2026-09-18. It is preserved in the archive; the latest stories are on the live feed.

Twice in this series, a client refused to connect to a working MCP server, and both refusals looked like bugs until they turned out to be the specification doing its job. The first was in MCP vs API Is the Wrong Question . The Functions-hosted MCP server was protected by its mcp_extension system ke…

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  1. 2026-09-18 11:06 · DEV Community — AI
    What a 401 Means to an MCP Client

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