Function injectToolsPrompt

src/chat.ts:62–98

(messages: any[], tools: any[])

// ==================== Tool Calling Helpers ====================

function injectToolsPrompt(messages: any[], tools: any[]): any[] {
  if (!tools || tools.length === 0) return messages;
  const toolsDesc = tools.map((tool: any) => {
    const fn = tool.function || tool;
    return `### ${fn.name}
Description: ${fn.description || ""}
Parameters: ${JSON.stringify(fn.parameters || {}, null, 2)}`;
  }).join("\n\n");
  const prompt = `You are an assistant with access to tools. When you need to use a tool, you MUST output ONLY a single JSON object with NO markdown, NO explanations, and NO extra text.

STRICT RULES:
1. If a tool is needed, output EXACTLY this format (nothing else):
{"tool_calls":[{"name":"TOOL_NAME","arguments":{"param":"value"}}]}

2. Do NOT wrap the JSON in markdown code blocks (no \`\`\`json).
3. Do NOT add any explanation before or after the JSON.
4. If no tool is needed, respond normally with plain text.

Available tools:
${toolsDesc}

Examples:
User: What is the weather in Beijing?
Assistant: {"tool_calls":[{"name":"get_weather","arguments":{"location":"Beijing"}}]}

User: Hello
Assistant: Hello! How can I help you today?`;
  const newMessages = [...messages];
  const systemIdx = newMessages.findIndex((m: any) => m.role === "system");
  if (systemIdx >= 0) {
    const original = newMessages[systemIdx].content || "";
    newMessages[systemIdx] = { ...newMessages[systemIdx], content: original + "\n\n" + prompt };
  } else {
    newMessages.unshift({ role: "system", content: prompt });
  }
  return newMessages;
}

function parseToolCalls(content: string): { tool_calls: any[] | null; text: string } {
  if (!content || !content.trim()) return { tool_calls: null, text: content };