nanoclaw

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Adam fe2e881b37 fix(agent-runner): drop <messages> envelope so claude-agent-sdk calls API

When 2+ pending messages were bundled into <messages>...</messages> at
container/agent-runner/src/formatter.ts:162-167, the Claude Agent SDK
responded with a synthetic stub (model="<synthetic>", stop_reason=
"stop_sequence", content="No response requested.") instead of calling
the real API. The poll loop never yielded a `result` event, so the
inbound message was never marked completed; the container exited; the
next sweep tick respawned it with the same batch; same synthetic; the
transcript file ballooned with each retry until tries=5 → failed.

Single-message turns (which skipped the wrapper) worked normally — the
SDK's heuristic appears to treat the wrapped envelope as a context dump
rather than a real user turn. Each `<message id=... from=...>...</message>`
block is already self-contained, so dropping the outer wrapper lets the
N>1 case work the same way the N=1 case always has.

Fix:

  function formatChatMessages(messages: MessageInRow[]): string {
    return messages.map(formatSingleChat).join('\n');
  }

Updates one existing test that asserted on the envelope, and adds two
regression tests: one negative (no `<messages>` wrapper), one positive
(each inbound row produces a `<message>` block in order).

Confirmed working in a real install: two stuck lanes recovered after
reducing their pending queue to 1 message, and both produced normal
replies from claude after the wipe + this fix were both applied (the
wipe alone wasn't enough — a fresh session given the same batch shape
hit the same synthetic loop).

Refs nanocoai/nanoclaw#2555 for full repro + transcript evidence.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-19 23:47:41 +10:00