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.
Added explicit error logging when streaming fails and non-streaming fallback is disabled, controlled by tengu_disable_streaming_to_non_streaming_fallback feature flag.
Evidence
Streaming fallback (search for "non-streaming fallback disabled")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.