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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.85 26 Mar 2026

Connection Resilience for Stale Connections

API request retries now detect stale connections (ECONNRESET/EPIPE) and automatically disable HTTP keep-alive for the retry attempt. This is controlled by the tengu_disable_keepalive_on_econnreset feature flag and prevents repeated failures on dead TCP connections.

Evidence

Stale connection handling (search for "Stale connection (ECONNRESET/EPIPE)")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.85 →