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repro: BYOK sub-agent with sonnet model fails with Responses API 400#42215

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pelikhan with Copilot wants to merge 1 commit into
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copilot/standalone-repro-byok
Closed

repro: BYOK sub-agent with sonnet model fails with Responses API 400#42215
pelikhan with Copilot wants to merge 1 commit into
mainfrom
copilot/standalone-repro-byok

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Commits on Jun 29, 2026