動的ターン

type ResearchContext = {
  fast: boolean;
};

const agent = createAgent<string, string, ResearchContext>({
  id: "research-agent",
  model: ({ context }) =>
    context?.fast ? "phaseo/free" : "anthropic/claude-sonnet-4",
  instructions: ({ numberOfTurns }) =>
    `Research turn ${numberOfTurns}. Cite the evidence you use.`,
});

const chooseMode = defineTool({
  id: "choose-mode",
  async execute(input: { fast: boolean }, context) {
    context.setContext({ fast: input.fast });
    return { selected: input.fast ? "fast" : "thorough" };
  },
});

const broadenSearch = defineTool({
  id: "broaden-search",
  nextTurnParams: {
    temperature: 0.3,
    maxOutputTokens: 2_000,
  },
  async execute() {
    return { broadened: true };
  },
});