Set to 1 to stop Claude Code from sending the structured-output output_config.format field and the anthropic-beta value that pairs with it, for an LLM gateway whose upstream rejects them. This leaves on the other pre-release capabilities that CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS turns off. Requires Claude Code v2.1.288 or later
Fixed session titles, memory recall and prompt hooks failing on Mantle or behind gateways that reject structured outputs; added CLAUDE_CODE_DISABLE_STRUCTURED_OUTPUTS to turn structured outputs off