fix(channels): deliver the first reply on a thread - #6072
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The delivery worker's first post for an item has no receipt yet, and that branch passed an empty locator to the adapter. The Slack adapter needs locator['channel'], so it raised KeyError and the first answer on any thread was silently never delivered — the playground showed the answer, Slack showed 'Working…' forever. The thread row already holds the full target (team, channel, thread_ts); _send now takes the thread and uses its locator for the no-receipt post. Same defect class as the bridge's F63: a read with no writer, surviving because fixtures seeded the receipt directly.
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Railway Preview Environment
Updated at 2026-09-08T11:43:10.325Z |
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Folded into the successor branch |
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Successor: #6644 |
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Context
The agent ran and answered, the playground showed the reply, and Slack showed "Working…" forever. The delivery worker crashed with
KeyError: 'channel'inside the Slack adapter. The first post for an outbox item has no receipt yet, and that branch of_sendpassed an empty locator, although the thread row holds the full target (team, channel, thread timestamp). The first-ever answer on any thread could never be delivered.Changes
_sendnow takes the thread and usesthread.data.external_locatorfor the no-receipt post. Later posts and edits keep using the stored receipt, unchanged.This is the same defect class the branch's ledger records for the bridge adapter (F63): a read with no writer, which survived because test fixtures seeded the receipt directly and never exercised the first post.
Tests
post_messagereceives).