Claude Code gateway compatibility guide changedllm-gateway-protocol
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134134Claude Code retries automatically after some upstream rejections and disables the rejected capability for the rest of the conversation. Rejections of the `thinking` field, of [thinking signatures](https://platform.claude.com/docs/en/build-with-claude/extended-thinking), and of mid-conversation system messages all recover this way. Context management and tool schema field rejections don't retry; those `400` errors reach the developer.
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136The retry logic matches on the upstream's error wording, so forward error response bodies unmodified. A gateway that wraps upstream errors in its own envelope breaks the recovery path even when it preserves the status code.
136The retry logic matches on the upstream's error wording, so forward error response bodies unmodified. A gateway that wraps upstream errors in its own envelope breaks the recovery path, even when it preserves the status code, unless the envelope's message carries a stable `capability_rejected:` token. [Claude apps gateway substitutes those tokens for cloud providers' error wording](/docs/en/claude-apps-gateway-config#upstream-error-messages), for example `capability_rejected: prompt_too_long`.
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138138### Disable pre-release capabilities
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