Narrowing the previous patch to only MlsMessageUnprocessable /
MlsMessagePreviouslyFailed still leaves wn stuck retrying
\`MdkCoreError("Failed to decrypt message with any exporter secret")\`
— mdk surfaces that as an Err variant rather than the Unprocessable
result enum, so it took the full 10-attempt exponential backoff (~17
minutes) before giving up. That was enough to block later
decryptable commits and regress test 11 (leave group) from pass back
to fail.
mdk-core doesn't retry internally, so ANY Err it returns is terminal
by construction. Treating the whole \`MdkCoreError\` variant as
one-shot is therefore equivalent to "trust mdk's verdict" rather
than "permissive skip" — if mdk decides the message is bad, it will
stay bad.
Net in the headless harness: 6/13 pass (up from 5/13 with the
narrower patch and 1/13 baseline).
https://claude.ai/code/session_016kAxdp6ubB5CnF9URhCEzP
Claude
0b7b1353e8