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* fix(agents): keep HarnessGuard from rewriting the result that ends a loop The alternating-loop check fired when three of the last four tool calls failed, without checking the current call. After A and B failed in turn, a successful B therefore received the OSCILLATION DETECTED warning: the model was told to stop just as the loop ended, and structured output such as JSON was corrupted by the appended text. Only a failing call now continues the pattern, so successful results reach the model unchanged. Failing alternation still warns. * fix(agents): only warn on an alternating loop when the whole window failed The oscillation check still counted 3 errors out of the last 4 calls, so a window that contained a success could warn on the next failure, e.g. A err, B err, A ok, B err. A success ends the loop, so require all four calls in the window to have failed, and pin the break shapes with tests. --------- Co-authored-by: Totoro <msy626836554@gmail.com>