Function translateToCodexBody

src/services/api/codex-fetch-adapter.ts:222–269

* Translates a complete Anthropic API request body to Codex format. * @param anthropicBody - The Anthropic request body to translate * @returns Object containing the translated Codex body and model

(anthropicBody: Record<string, unknown>)

 * @returns Object containing the translated Codex body and model
 */
function translateToCodexBody(anthropicBody: Record<string, unknown>): {
  codexBody: Record<string, unknown>
  codexModel: string
} {
  const anthropicMessages = (anthropicBody.messages || []) as AnthropicMessage[]
  const systemPrompt = anthropicBody.system as
    | string
    | Array<{ type: string; text?: string; cache_control?: unknown }>
    | undefined
  const claudeModel = anthropicBody.model as string
  const anthropicTools = (anthropicBody.tools || []) as AnthropicTool[]

  const codexModel = mapClaudeModelToCodex(claudeModel)

  // Build system instructions
  let instructions = ''
  if (systemPrompt) {
    instructions =
      typeof systemPrompt === 'string'
        ? systemPrompt
        : Array.isArray(systemPrompt)
          ? systemPrompt
              .filter(b => b.type === 'text' && typeof b.text === 'string')
              .map(b => b.text!)
              .join('\n')
          : ''
  }

  // Convert messages
  const input = translateMessages(anthropicMessages)

  const codexBody: Record<string, unknown> = {
    model: codexModel,
    store: false,
    stream: true,
    instructions,
    input,
    tool_choice: 'auto',
    parallel_tool_calls: true,
  }

  // Add tools if present
  if (anthropicTools.length > 0) {
    codexBody.tools = translateTools(anthropicTools)
  }

  return { codexBody, codexModel }
}

// ── Response translation: Codex SSE → Anthropic SSE ─────────────────