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* fix(agents): request the forced final answer as a user turn When an agent reaches max_iter, handle_max_iterations_exceeded appended the "give your best final answer" instruction as an assistant message and relied on assistant prefill to make the model continue it. Current Claude models (Opus 5, Sonnet 5, Fable 5.x, the 4.6+ family) reject a request that ends on an assistant turn with a 400, after the whole iteration budget has already been spent. The instruction is now appended as a user turn, which every provider accepts. The handler's formatted_answer parameter is dropped: every caller had already appended that text as the last assistant message, so prefixing it again only duplicated history. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> * fix(agents): stop the lite agent loop after the forced final answer LiteAgent._invoke_loop fell through after handle_max_iterations_exceeded and issued a regular LLM call on the same history, discarding the forced answer. Break out of the loop the way CrewAgentExecutor already does, and assert a single LLM call in the test. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com> Co-authored-by: Vidit Ostwal <110953813+Vidit-Ostwal@users.noreply.github.com>