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Anthropic Messages is a different protocol, not a flag — and shims leak

This story is from 2026-09-16. It is preserved in the archive; the latest stories are on the live feed.

The failure has a shape. Your Claude-based agent connects to the new endpoint, answers the first question well, executes a tool, comes back, executes another — and then somewhere around step seven it stops calling tools and starts narrating that it would call a tool. Or it loses the thread of a lon…

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  1. 2026-09-16 01:44 · DEV Community — AI
    Anthropic Messages is a different protocol, not a flag — and shims leak

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