fix: swap retired Sonnet 4 for Sonnet 4.6#13
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claude-sonnet-4-20250514 (Claude Sonnet 4) was retired on 2026-06-15 and now returns 404 not_found_error on every request. Because the main chat() call threw, the bot marked incoming messages as read and started the typing indicator (those API calls succeeded) but never sent a reply. Swap to claude-sonnet-4-6, the documented drop-in replacement. No other changes needed — the call uses no budget_tokens, prefills, or sampling params. Mirrors the earlier Haiku 3.5 -> 4.5 fix (#9). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Problem
The live agent (Claude Sullivan, +1 415-870-7772) stopped responding: it marked incoming messages as read and started the typing indicator, but never sent a reply.
Root cause: the main chat model
claude-sonnet-4-20250514(Claude Sonnet 4) was retired on 2026-06-15 and now returns404 not_found_erroron every request. Sincechat()threw before sending anything, the read/typing API calls (which run first) succeeded while the reply never happened.App Runner logs showed this on every inbound message:
Fix
Swap to
claude-sonnet-4-6(Claude Sonnet 4.6), the documented drop-in replacement. No other changes needed — the call uses nobudget_tokens, prefills, or sampling params. Mirrors the earlier Haiku 3.5 → 4.5 fix (#9).Deploy status
linq-blue-agent-example) as a hotfix to restore service. This PR brings the repo in sync with what's running.Test plan
npm run buildpasses