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.
Remote tool calls have a distinct code for unverified approvals
You'll notice
Useful2Signal2
Elsewhere
A remote tool call whose approval couldn't be verified now gets its own distinct failure message.
What's wrong with this entry?
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What
A remote tool call whose approval could not be verified now ends as approval_unverified with its own message, rather than being lumped in with dropped, timed-out or transport errors.
Details
The classifier checks this case against the originating call before falling through to the generic transport-error path.
Evidence
approval_unverified
Strings lifted out of the shipped bundle, so the claim above can be checked against them.