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.
Unrenderable message errors no longer echo arbitrary text
You'll notice
Useful2Signal2
Terminal UI
The "unable to render message" notice no longer echoes arbitrary text from the message.
What's wrong with this entry?
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What
The "Unable to render message type" fallback used to print the raw type value from the message block. It now prints the type only if it is on an allowlist, and otherwise reports non-allowlisted (non-string) or just a length.
Details
The allowlist now includes the newly handled fallback and mid_conv_system types.
Evidence
non-allowlisted (non-string)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.