Error: Claude Opus 4.7 - Unknown error

Error Details

Model: Claude Opus 4.7
Provider: custom
Status Code: N/A

Error Output

Unable to complete request to the Language Model Service. Error: {
  "originalError": "Error: HTTP 400 Bad Request from https://waypoint-envoy.rubix-system.svc.cluster.local:8443/compute/47f9d4/foundry/foundry-container-service-api/foundry-container-service/api/foundry-proxy/language-model-service/api/llm/v3/completion/AnthropicClaude_4_7_Opus/streamCompletionChunk\n\n{\"errorCode\":\"CUSTOM_CLIENT\",\"errorName\":\"LanguageModelService:LlmHttpClientError\",\"errorInstanceId\":\"52f9c3a6-b03f-4d6b-b2ce-b08ed9641713\",\"parameters\":{\"modelCreator\":\"Optional[ANTHROPIC]\",\"responseBody\":\"Optional[{\\\"message\\\":\\\"messages: text content blocks must be non-empty\\\"}]\",\"modelBackendId\":\"Optional[VERTEX]\",\"errorType\":\"Optional.empty\",\"errorMessage\":\"Optional.empty\",\"errorCode\":\"Optional.empty\",\"statusCode\":\"400\"}}",
  "type": "OTHER"
}

Additional Context
Please add any additional context about the error here

The report names no files, entry points, or tests. Start by reproducing the Claude Opus 4.7 request through the custom provider and trace handling of the empty text content block indicated by the HTTP 400 response. Done means the request is handled correctly and a regression test covers the failure.