Function sideQueryViaGemini

src/utils/sideQuery.ts:549–740

* Gemini side query. Converts Anthropic-format params to Gemini * generateContent format, sends a non-streaming request via fetch, * and wraps the response back into a BetaMessage shape.

(
  opts: SideQueryOptions,
)

 * and wraps the response back into a BetaMessage shape.
 */
async function sideQueryViaGemini(
  opts: SideQueryOptions,
): Promise<BetaMessage> {
  const {
    model,
    system,
    messages,
    tools,
    tool_choice,
    max_tokens = 1024,
    temperature,
    signal,
  } = opts

  const normalizedModel = normalizeModelStringForAPI(model)
  const geminiModel = resolveGeminiModel(normalizedModel)

  // Build Gemini contents from Anthropic MessageParam[]
  const contents: Array<{
    role: 'user' | 'model'
    parts: Array<{ text: string }>
  }> = []
  for (const m of messages) {
    if (m.role !== 'user' && m.role !== 'assistant') continue
    const text =
      typeof m.content === 'string'
        ? m.content
        : Array.isArray(m.content)
          ? m.content
              .filter(
                (b): b is { type: 'text'; text: string } => b.type === 'text',
              )
              .map(b => b.text)
              .join('\n')
          : ''
    if (text) {
      contents.push({
        role: m.role === 'assistant' ? 'model' : 'user',
        parts: [{ text }],
      })
    }
  }

  // Build system instruction
  const systemText = extractSystemText(system)
  const systemInstruction = systemText
    ? { parts: [{ text: systemText }] }
    : undefined

  // Convert tools and tool_choice
  const geminiTools =
    tools && tools.length > 0
      ? anthropicToolsToGemini(tools as BetaToolUnion[])
      : undefined
  const geminiToolConfig = tool_choice
    ? anthropicToolChoiceToGemini(tool_choice)
    : undefined