d 🔹 77b8ef79ca fix(middleware): use HumanMessage in LoopDetectionMiddleware for Anthropic compat (#1300) ...

LoopDetectionMiddleware injected SystemMessage mid-conversation to warn
about repetitive tool calls. This crashes Anthropic models because
langchain_anthropic's _format_messages() requires system messages to
appear only at the start of the conversation — interleaved system
messages raise 'Received multiple non-consecutive system messages'.

Switch the warning injection from SystemMessage to HumanMessage, which
works with all providers (Anthropic, OpenAI, Google, etc.).

Fixes #1299

Co-authored-by: voidborne-d <voidborne-d@users.noreply.github.com>

2026-03-25 08:00:01 +08:00

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